What the Class 12 Environmental Education Syllabus Covers
Environmental Education is a compulsory subject for Class 12 in the state board, but it does not work like your other papers. You are not chasing a marks total here. The subject is assessed through a graded system, and your final result appears as a grade on the marksheet rather than a conventional marks-based score [verify]. That single difference changes how you should prepare: consistent work through the year matters more than a last-week revision sprint.
The syllabus is built around a fixed set of broad themes. Every unit you study sits inside one of them:
- Ecosystems: how living organisms interact with each other and with their surroundings
- Biodiversity: the variety of plants, animals and microorganisms in a region, and why losing it matters
- Pollution: air, water, soil and noise pollution, their sources and control measures
- Natural resources: renewable and non-renewable resources and how to conserve them
- Sustainable development: meeting present needs without damaging what future generations depend on
- Environmental awareness: what you as a citizen can actually do, from waste segregation to local campaigns
The syllabus is deliberately activity-based. Project work, field visits and internal assessment are part of the subject itself, not extras. For example, a unit on local water pollution is meant to be studied alongside an actual visit to a pond, stream or treatment plant near your home, with your observations recorded in a field diary. If you are choosing a project, our Class 12 Environmental Education project topics and sample reports page can help you pick something local and workable.
The textbook is published by the state board and is available in both English and Marathi mediums, with identical content in each. The syllabus follows the National Curriculum Framework and leans towards practical environmental action rather than pure theory, so expect case studies of real Indian environmental problems and exercises that ask you to apply concepts to your own neighbourhood.
Unit-Wise Breakdown of the Class 12 Environmental Education Syllabus
The syllabus is organised into six units. The first five are concept units that you study from the textbook and discuss in class; the sixth is where you apply everything to a real local issue through project work. The table below gives you the map. Treat the "key topics" column as a checklist: if you can explain each item in your own words and give one Indian example, you have covered that row.
| Unit | Unit name | Key topics to cover | Approximate periods [verify] |
|---|---|---|---|
| 1 | Environment and Ecosystems | Components of the environment; biotic and abiotic factors; food chains and food webs; energy flow; ecological pyramids; types of ecosystems (forest, grassland, aquatic, desert); biogeochemical cycles | Around 12 to 15 periods [verify] |
| 2 | Natural Resources and Their Conservation | Renewable and non-renewable resources; forest, water, soil, mineral and energy resources; overuse and depletion; conservation methods; rainwater harvesting; renewable energy sources | Around 12 to 15 periods [verify] |
| 3 | Environmental Pollution and Control | Air, water, soil and noise pollution; sources and effects; primary and secondary pollutants; greenhouse gases; waste management; pollution control measures and legislation | Around 12 to 15 periods [verify] |
| 4 | Biodiversity and Its Conservation | Levels of biodiversity (genetic, species, ecosystem); hotspots and threatened species; causes of biodiversity loss; in-situ and ex-situ conservation; protected areas; biosphere reserves | Around 10 to 12 periods [verify] |
| 5 | Sustainable Development and Environmental Ethics | Meaning of sustainable development; resource use and equity; environmental ethics and values; role of individuals, communities and government; environmental movements and laws | Around 10 to 12 periods [verify] |
| 6 | Environmental Action and Project Work | Selecting a local environmental issue; survey and data collection; field visits; preparing a project report; awareness activities; viva presentation | Continuous through the year; assessed internally [verify] |
Unit 1: Environment and Ecosystems
This unit sets up the vocabulary the rest of the syllabus depends on. An ecosystem is a community of living organisms interacting with each other and with the non-living surroundings (soil, water, air, sunlight). You need to be able to separate biotic components (producers, consumers, decomposers) from abiotic ones, and trace how energy moves through a food chain.
Typical exam questions here ask you to draw a food web for a named habitat, or explain why energy decreases at each trophic level. A common mistake is writing "energy is lost" without saying where it goes. The fix: say it is used in respiration, lost as heat, or passed out as waste. Link each concept to an ecosystem near you, such as a pond, a mangrove patch or a patch of forest, and note what you observe on a visit.
Unit 2: Natural Resources and Their Conservation
Here you study the resources you use daily and how fast they are being used up. Learn the difference between renewable resources (sunlight, wind, water, biomass, which can be replenished) and non-renewable resources (coal, petroleum, minerals, which cannot). For each resource, know the causes of depletion and at least two conservation methods.
Water and soil are the two resources most often tested with case-study questions, such as a watershed facing groundwater decline. Prepare one local example each for rainwater harvesting, drip irrigation and soil conservation. Field visits fit naturally here: a visit to a farm, a check dam or a municipal water treatment plant gives you material you can quote in your project as well as your answers.
Unit 3: Environmental Pollution and Control
This is the largest unit in practice. For each pollution type (air, water, soil, noise), be ready to state the sources, the effects on health and environment, and the control measures. Understand terms such as pollutant, primary pollutant (released directly, like carbon monoxide from vehicles) and secondary pollutant (formed in the atmosphere, like ground-level ozone).
Link this unit to your project. If you measure noise levels near a busy junction at three times of day, or record what is dumped at a nearby nullah, you have primary data that strengthens both your report and your theory answers. The board expects case studies and local environmental issues to be discussed within the unit, not memorised in isolation.
Unit 4: Biodiversity and Its Conservation
Biodiversity is the variety of life at three levels: genetic (variation within a species), species (number of different species) and ecosystem (variety of habitats). Learn the major causes of biodiversity loss and the difference between in-situ conservation (protecting species where they naturally live, as in national parks and wildlife sanctuaries) and ex-situ conservation (protecting them outside their habitat, as in zoos, botanical gardens and seed banks).
Know at least two Indian biodiversity hotspots and one protected area from Maharashtra, and be able to say what threatens it. A common mistake is naming a sanctuary without saying what it protects. The fix: always attach a species or habitat to the name.
Unit 5: Sustainable Development and Environmental Ethics
Sustainable development means meeting present needs without compromising the ability of future generations to meet theirs. This unit is more discussion-based, so practise writing short paragraphs rather than memorising lists. Be clear on environmental ethics: the values that decide how humans ought to treat nature, and how individual choices (waste segregation, water use, transport) connect to larger policy questions.
Expect questions that ask you to give your opinion with reasons, for example whether a development project should be allowed near a forest. Answers that cite a law, a movement or a local example score better than general statements.
Unit 6: Environmental Action and Project Work
Unit 6 is not studied from a chapter. It is the project you carry out through the year, and it carries the internal assessment weightage [verify]. You pick a local environmental problem, survey it, collect data, and present findings and solutions in a report, followed by a viva. The board recommends integrating field visits and practical activities within every unit, so keep a single field diary through the year and record observations unit by unit; it becomes your project evidence and your revision notes at the same time.
If you are still deciding what to work on, our Class 12 Environmental Education project topics and sample reports page lists workable local ideas, and the Class 12 Environmental Education textbook PDF download page gives you the official chapter-wise content to match your project to the syllabus.
How Environmental Education Is Assessed in Class 12
Environmental Education is not assessed by one exam alone. Your final grade is built from two parts that run side by side through the year: internal assessment (project work, field visits and participation) and a theory examination [verify]. Both parts are compulsory, and both appear on your marksheet as a grade rather than as marks out of 100.
Theory Examination
The theory paper tests the five concept units. The board's pattern for this subject has changed over the years, so confirm the current one before you plan revision: the paper has been set as a 100-mark paper whose marks are converted to grades, and in some years as a shorter 50-mark paper [verify]. Whichever applies to your batch, expect a mix of objective questions (fill in the blanks, match the columns, true or false), short answers of two to three lines, and longer answers where you explain a process or discuss a local issue [verify].
A typical short-answer question: "Why does energy decrease at each trophic level?" A full-credit answer names the process (respiration), states the form energy takes when it leaves the chain (heat) and mentions energy lost in waste. Writing only "energy is lost" usually earns partial credit. That difference between a vague line and a specific one is where most marks are won or lost.
Internal Assessment and Project Work
Internal assessment is marked by your school through the year. It usually includes:
- Project report on a local environmental issue, with methodology, observations and suggestions.
- Field diary recording visits, dates, observations and sketches.
- Awareness activities such as a rally, poster campaign, tree plantation or waste segregation drive in your locality.
- Viva where you explain your project and answer questions on it.
Keep every component documented as it happens. A diary written up in February from memory looks thin, and examiners notice. Our page on Class 12 Environmental Education project topics and sample reports shows how a complete report is structured.
Grading Pattern
The final grade combines your internal and theory performance and is printed on the marksheet [verify]. You must clear both components separately; strong project work cannot cover a failed theory paper, and good theory marks cannot cover missing project work.
| Component | What it includes | Assessed by |
|---|---|---|
| Theory examination | Objective, short-answer and long-answer questions from Units 1 to 5 | State board exam [verify] |
| Project report | Local issue, survey, data, analysis, suggestions | School teachers (internal) |
| Field diary and visits | Dated observations, notes, photographs | School teachers (internal) |
| Awareness activities | Participation in drives, campaigns, school programmes | School teachers (internal) |
| Viva | Oral questions on your project and related concepts | School teachers (internal) |
Check the state board Class 12 exam pattern and grading system overview for how grades are calculated in your other subjects, and solve Environmental Education previous year question papers to see the actual question style before the theory exam.
Environmental Education Textbook: Medium and Availability
The state board publishes the Class 12 Environmental Education textbook in both English and Marathi mediums [verify]. The two editions are not different books. The chapters, activities, case studies, diagrams and project guidelines are the same; only the language of explanation changes. So a student in a Marathi-medium school and a student in an English-medium school are preparing from identical content, and a question asked from the English edition can be answered from the Marathi one without any gap.
English Medium
The English edition is used in English-medium schools and by students who prefer to write answers in English. Read the chapter text once, then work through the "Let us do" style activities printed inside each chapter, because these are close to what appears in internal assessment.
Marathi Medium
The Marathi edition carries the same unit structure and the same project instructions. If you study in Marathi but plan to refer to English news articles on pollution or conservation for your project, keep a small glossary of terms in both languages so your report stays consistent.
Where to Get the Textbook
You have two routes:
- Official PDF: the state board's textbook website hosts free PDFs of its Class 12 textbooks, including Environmental Education [verify]. Download the file for your medium and keep a copy offline on your phone.
- Printed copy: buy from the school's authorised book seller or a standard textbook shop. Check that the edition matches the current academic year before paying, since old stock is often sold at a discount.
Treat the textbook as your main resource for both the theory paper and the project. The project guidelines, suggested topics and report format are printed in it, so a project built from those pages will match what your teacher expects. Our Class 12 Environmental Education textbook PDF download page explains how to save and use the official file, and the project topics and sample reports page shows what a finished report looks like.
Syllabus vs Textbook: What's the Difference?
The syllabus and the textbook do two different jobs, and students who mix them up waste time. The syllabus is the official outline: it lists the units, the broad objectives of each unit, and the assessment scheme (how much weight goes to the theory paper and how much to internal assessment). The textbook is the detailed content resource: it explains each topic, gives examples and case studies, and sets exercises at the end of every chapter.
Take Unit 3 on pollution as an example. The syllabus will say something like "Environmental Pollution and Control: types of pollution, sources, effects, control measures". That one line tells you the scope of the unit, nothing more. The textbook chapter then explains what air pollution is, lists its sources, describes its effects on health and crops, and gives control measures with examples. If you only read the syllabus, you know what to study but not what to write. If you only read the textbook, you may spend days on a sub-topic the syllabus treats as minor.
Use them in this order:
- Syllabus first: read the unit names and objectives to fix the boundary of what is examinable. Anything outside it does not need deep study.
- Textbook second: read the chapter for explanations, examples and exercises. This is where actual understanding happens.
- Syllabus again before the exam: run down the unit list and check that you can say something concrete about every heading.
The board can revise the syllabus or bring out a new textbook edition, so confirm you are using the current academic year's material [verify]. A chapter dropped from the syllabus will not be asked even if it is still printed in an older book. Our Class 12 Environmental Education textbook PDF download page links the official file, and the project topics and sample reports page shows how textbook guidelines turn into a finished report.
Unit-Wise Preparation Strategy for Class 12 Environmental Education
Treat this subject like two subjects in one: the theory units (1 to 5) and the project unit (Unit 6). Theory needs steady reading and note-making. The project needs weeks of work, not days, so it must start early and run alongside your theory revision. The plan below assumes roughly eight weeks, which you can stretch or compress to fit your school's internal assessment dates [verify].
| Week | Focus | What to finish by the end of the week |
|---|---|---|
| 1 | Unit 1: Environment and Ecosystems | Notes on ecosystem components, food chains, energy flow; one local ecosystem example |
| 2 | Unit 2: Natural Resources and Conservation | Notes on resource types, overuse, conservation methods; start thinking about a project topic |
| 3 | Unit 3: Pollution and Control | Notes on types, sources, effects, control measures; project topic finalised and approved by teacher |
| 4 | Unit 4: Biodiversity and Conservation | Notes on biodiversity levels, threats, protected areas; first field visit done |
| 5 | Unit 5: Sustainable Development and Ethics | Notes on sustainability, environmental ethics, laws; project data collection complete |
| 6 | Unit 6: Project work | Draft project report written; photographs and field diary organised |
| 7 | Revision + project finalisation | Full revision of Units 1 to 5; final project report bound and submitted |
| 8 | Viva and theory practice | Viva presentation rehearsed; short answers and definitions revised |
Approaching Theory Units
For each theory unit, make a one-page note sheet with three columns: key definitions, case studies, and local environmental issues. For example, in Unit 3, the definition of pollution, the textbook's case study on a polluted river or city air, and a local example such as a nearby nala or dumping ground all go on the same sheet. This is exactly what a long-answer question rewards: a definition, an explained example, and a control measure. A common mistake is writing long paragraphs with no definition or example, which loses marks even when the general idea is right. The fix is simple: answer in three parts, define, explain with an example, then suggest a solution.
Planning Project Work
Choose a local environmental problem you can actually observe, such as waste segregation in your housing society, water wastage in your building, or noise levels near a market. A copied internet project on global warming scores poorly because it has no primary data. Start in week 3 so that data collection, writing, and binding are not rushed in the last week. Our Class 12 Environmental Education project topics and sample reports page shows how to shape a topic into a full report.
Integrating Field Visits
Plan at least two short visits, for example a garden or pond for Unit 1 and a market or industrial area for Unit 3. Carry a notebook and note date, time, place, what you saw, and how it connects to a textbook concept. Photographs help, but label them. A field visit that is only described in general words, without dates or observations, is easy for an examiner to doubt. For structure, see how to prepare a field visit report for Environmental Education.
For internal assessment, keep a single project file with the report, field diary, photographs, and any awareness material you prepared. Rehearse a two-minute viva answer on why you chose your topic, what you found, and what you would suggest as a solution. Examiners usually ask about your own observations first [verify].
Important Topics and Concepts to Focus On
Key Definitions
Almost every long answer in this subject begins with a definition, so learn these in one clean sentence each. An ecosystem is a unit where living organisms interact with each other and with their non-living surroundings (soil, water, air, sunlight). Biodiversity is the variety of life at three levels: genetic, species and ecosystem. Pollution is the addition of any substance or form of energy to the environment in quantities that harm living things. Sustainable development means meeting present needs without destroying the ability of future generations to meet theirs. Environmental ethics is the set of moral principles that guide how humans should treat nature and other species.
Write each definition in your own words, then check it against the textbook. A definition copied word for word is easy to forget under exam pressure; one you have rephrased yourself stays.
Case Studies
Your textbook carries case studies in several units, and these are the examples examiners expect you to name. Typical ones include a polluted river or urban air-quality case for the pollution unit, and a protected area or local conservation effort for the biodiversity unit. Note that the exact case studies and their page numbers vary by edition, so confirm them in your own copy [verify].
For each case study, write four lines: what happened, what caused it, what was the effect, and what was done or should be done. That four-line format answers a "suggest measures" question directly.
Current Environmental Issues
Link each unit to something happening now: climate change and extreme weather (ecosystems, sustainable development), plastic pollution and waste segregation (pollution), and local conservation efforts such as tree plantation drives or lake clean-ups (biodiversity). A current example is worth more than a general statement. "Plastic bags choke the drain outside my building every monsoon" is a usable answer; "plastic is bad for the environment" is not.
Keep a glossary notebook with one term per line and its definition beside it, and revise it for ten minutes twice a week. Add new terms as you meet them in the textbook. Follow local environmental news, a municipal notice on waste collection or a report on a nearby river, and note one line about it. These become your practical examples in both theory answers and the viva. For exam-style practice, work through Environmental Education previous year question papers and mark which definitions and case studies repeat.
Project Work and Internal Assessment: What to Expect
The internal assessment is where most students lose easy marks, not because the work is hard but because it is left for the last fortnight. Treat the project as a subject in itself and give it a fixed slot in your weekly timetable from the start of the year. Marks here are awarded for a process you can see and document, so a simple project done carefully beats an ambitious one submitted in a hurry.
Project Report Format
A project report is the written record of what you studied, how you studied it, and what you found. Keep the structure standard, because examiners look for these headings:
- Title: specific and local, such as "Changes in water quality of a neighbourhood lake after the 2023 clean-up drive", not "Water pollution".
- Introduction: why you chose this topic and what you wanted to find out.
- Methodology: how you collected information, for example a questionnaire of 30 households, water samples from two points, or interviews with three residents.
- Observations: what you saw, measured or recorded. Present it as a table or a simple graph wherever numbers are involved.
- Analysis: what the observations mean and how they connect to textbook concepts such as pollution sources or resource conservation.
- Conclusion: your answer to the question in the title, plus two or three practical suggestions.
- References: textbook, board material, any news report or local body notice you used.
Field Visit Guidelines
A field visit is a planned trip to observe an environmental situation directly: a lake, a market, a waste collection point, a garden or a polluted stretch of road. Carry a notebook and record the date, time, place and weather. Write what you see as you see it, take photographs with the location visible, and note who you spoke to. A field diary with dated entries is stronger evidence than a neat write-up created afterwards, and it is often checked during the viva. Keep the diary separate from the report so you can show both.
Assessment Criteria
Internal marks usually rest on four things: how relevant your topic is to the syllabus, how much genuine research went into it, how creatively you present it, and how clearly you explain it in the viva [verify]. Group projects are allowed, but each member's contribution must be identifiable, so write your own name against the sections you handled and be ready to answer questions on them. For ideas and formats, see our Class 12 Environmental Education project topics and sample reports.
To score well, pick a problem you can actually observe, collect primary data yourself instead of copying figures from the internet, and end with suggestions that a school or local body could realistically act on. If your report needs a field visit write-up, our guide on how to prepare a field visit report shows the format. A common mistake is submitting a project with no local data at all; the fix is one afternoon of observation and a short questionnaire, which instantly makes the report yours.
Exam Pattern and Grading for Environmental Education
Environmental Education is graded, not scored, but you still sit a written paper and you still have to clear it. The final grade on your marksheet comes from two separate parts: the theory paper set by the board and the internal assessment marked by your school. Both must be cleared independently, so a strong project cannot rescue a weak theory paper, and a good theory paper cannot cover up an incomplete project file.
Theory Paper Pattern
The theory paper usually follows the standard state board format for this subject: objective questions carrying one mark each, short answer questions of two to three marks, and longer answers of four to five marks that ask you to explain a concept or discuss a local case study [verify]. A typical long-answer question reads "Explain any three causes of urban air pollution and suggest two control measures", and marks are split between the causes and the measures, so half an answer earns half the marks. For practice sets in this format, see our Environmental Education previous year question papers.
Internal Assessment Weightage
Internal and external assessment are generally weighted equally, roughly 50 per cent each, though the exact split is decided by the board for the current year [verify]. The internal half covers your project report, field diary, awareness activities and viva, which is the short oral round where the examiner asks you about your own project.
| Component | What it includes | Approximate weight |
|---|---|---|
| Theory paper | Objective, short answer and long answer questions | About 50% [verify] |
| Project report | Written report with methodology, observations and conclusion | Part of internal 50% [verify] |
| Field diary | Dated notes and photographs from field visits | Part of internal 50% [verify] |
| Awareness activities and viva | Participation in drives, oral questioning on your project | Part of internal 50% [verify] |
Grading Scale
Marks are converted into letter grades, broadly A for the highest band down to C and lower, with each grade covering a range of marks rather than one exact score [verify]. The grade appears on your marksheet in place of a numerical total. Since the subject is compulsory for the Class 12 certificate, a failing grade in either component has to be cleared before the certificate is issued. Check the board's official website each year for the current paper pattern, mark split and grade bands, because these details are revised from time to time [verify].
Common Mistakes to Avoid in Environmental Education
Most students lose marks in this subject for reasons that have nothing to do with how hard they studied. The pattern is predictable, and every mistake below has a simple fix.
Leaving the project until the last fortnight. A project on, say, waste segregation in your housing society needs at least two field visits, a survey of residents and time to write up findings. Started in January, it becomes a rushed compilation of whatever is available online. Fix: fix your topic in the first month of the academic year and finish data collection before the first unit test.
Downloading a project and submitting it as your own. A report on the Sundarbans or on a river in another state is easy to find and easy for an examiner to spot. It also scores poorly because the assessment rewards primary data: your observations, your photographs, your locality. A modest study of drainage in your own lane, with a hand-drawn map and dated photos, will outscore a polished copied report.
Treating the subject as purely practical. Students assume that because the grade depends heavily on project work, definitions do not matter. They do. Questions asking you to define an ecosystem, distinguish pollution from contamination, or explain sustainable development appear every year and carry easy marks [verify].
Keeping a loose field diary. Entries written weeks after a visit, without dates, locations or photographs, are hard to defend in the viva. Write the entry the same day and paste photos beside it.
Skipping revision of key terms. Prepare a one-page glossary per unit and read it before each test. It takes ten minutes and protects marks you would otherwise drop.
Quick Revision Tips and Resources
Revision for this subject works best when it is visual and active, because the paper rewards clear definitions and local examples rather than long memorised passages. Build one mind map per unit on a single A4 sheet: put the unit name in the centre (for example, "Environmental Pollution"), branch out into types (air, water, soil, noise), and from each branch add causes, effects and one control measure. A mind map forces you to see how concepts connect, which is exactly what a long answer needs.
Keep a set of flashcards for terms that are easy to confuse. Write the term on one side and a two-line definition with one example on the other: "Pollution: addition of a harmful substance or form of energy to the environment. Example: untreated sewage released into a river." Run through the deck for five minutes before each test.
- Practise writing short answers (three to four lines) and one longer answer of about a page on a local issue such as plastic waste in your market area. Time yourself: a short answer should take about three minutes.
- Read the summary and exercise questions at the end of every chapter. Exercise questions often reappear in similar form in the paper [verify].
- Discuss case studies in a group of three or four. Explaining a case aloud exposes gaps in your understanding faster than re-reading.
- Solve previous year question papers once the syllabus is complete, and keep the project topics and sample reports page handy while finalising your own topic.
Frequently Asked Questions
Where can I download the official Class 12 Environmental Education textbook PDF?
The textbook is published by the state board, and the official PDF is normally hosted on the board's website under the textbooks section for Class 12 [verify]. Download the file for your medium (English or Marathi) and save a copy offline, because you will need it during project work when internet access may not be reliable. If the PDF is not listed, ask your school library or the subject teacher for the printed copy. Our Class 12 Environmental Education textbook PDF download page explains the steps.
Is Environmental Education a compulsory subject for Class 12 in the state board?
Yes. It is a compulsory subject for Class 12 students in the state board, but it is assessed through a graded system rather than a marks-based board paper [verify]. You must clear it to receive your Class 12 certificate, so do not treat it as optional even though it does not add to your percentage in the usual way.
How many marks is the Class 12 Environmental Education paper for?
The exact split between theory and internal assessment changes with board circulars, so confirm the current pattern with your teacher or the board's website before your exam [verify]. What stays constant is that project work and field documentation carry real weight. A student who writes a strong project report but skips revision of definitions loses marks just as surely as one who does the opposite.
Is there a project or field visit component in Class 12 Environmental Education?
Yes. Project work and field visits are part of the internal assessment, and your report is judged on relevance of the topic, depth of research and presentation. A common mistake is copying a project on "global warming" from the internet. The fix: pick a problem you can actually observe, such as waste segregation in your housing society or water stagnation in a nearby drain, collect your own photographs and notes, and suggest a practical solution. Sample topics and report structures are on our Class 12 Environmental Education project topics and sample reports page.
Is the Environmental Education textbook available in Marathi medium?
Yes. The state board publishes the textbook in both English and Marathi mediums, and the content is identical, only the language differs. Choose the medium you are comfortable writing in, since your project report and answers will be in that language.
Which edition of the Class 12 Environmental Education textbook is current?
The board revises textbooks from time to time, so use the edition recommended for the current academic year [verify]. Check the edition printed on the first page of your copy against the one your teacher names in class. If you are using an older PDF, compare the unit list with the current syllabus before you start preparing.