CUET Biology Ecology and Environment Important Questions and Answers

Overview: If you are preparing for CUET UG 2027, mastering CUET Biology Ecology and Environment Important Questions and Answers should be a top priority. This chapter is consistently among the most important units in the Biology syllabus and offers an excellent opportunity to score maximum marks with relatively less effort compared to more concept-heavy chapters.

Based on the recent CUET exam analysis, Ecology and Environment contributes around 5–8 questions every year. The chapter combines concepts from four NCERT Class 12 Biology chapters:

• Organisms and Populations
• Ecosystem
• Biodiversity and Conservation
• Environmental Issues

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These chapters explain how organisms interact with their surroundings, how ecosystems function, the importance of biodiversity conservation, and the environmental challenges affecting life on Earth.

One of the biggest advantages of this unit is that most questions are directly based on NCERT facts, definitions, diagrams, and ecological principles.

Students who regularly practise CUET Biology, Ecology, and Environment Important Questions and Answers can quickly identify recurring patterns and frequently tested concepts.

What is Ecology and Environment in CUET Biology?

Ecology and Environment is one of the highest-scoring and most conceptually rich chapters in the CUET Biology syllabus. It falls under Unit 4 of the Class 12 Biology curriculum and covers a wide range of topics from organism-level interactions to global environmental concerns.

For students aiming to score high in CUET 2027, this chapter is a goldmine because questions are largely concept-based, predictable, and repeat across years.

According to the CUET Biology Syllabus, Ecology and Environment is covered in detail and includes topics like population ecology, ecosystem structure, biodiversity conservation, and environmental issues.

If you know your NCERT well and practice the right questions, this chapter alone can help you gain significant marks.

Download CUET Biology Ecology and Environment Important Questions PDF

Download the PDF of the most important questions from the CUET Biology Ecology and Environment section to practice the most important and exam-focused questions from this chapter.

The PDF includes high-weightage MCQs, previous year questions, and detailed answer explanations to help you strengthen your concepts, improve accuracy, and score higher in the CUET Biology exam.

Download Important Questions for CUET Biology Ecology and Environment PDF

CUET Biology Ecology and Environment Important Questions and Answers 2027

Here are 30 important questions for CUET Biology Ecology and Environment, including actual PYQs and highly expected questions, presented in the exact format of the CUET question paper.

Q1. In which ecosystem is the biomass of primary consumers greater than that of producers?

(A) Forests 

(B) Grassland 

(C) Desert 

(D) Sea

Correct Answer: (D) Sea

Explanation: In most terrestrial ecosystems, the biomass of producers is always greater than that of consumers. However, in aquatic ecosystems like the sea, phytoplankton (producers) have a very short life span and rapid turnover rate. As a result, at any given point in time, the standing crop biomass of primary consumers (zooplankton) can exceed that of producers, resulting in an inverted biomass pyramid.

Q2. Match List I (Recently Extinct Animals) with List II (Place of Extinction):

List-I	List-II
(A) Dodo	(I) Africa
(B) Quagga	(II) Russia
(C) Thylacine	(III) Mauritius
(D) Steller's Sea Cow	(IV) Australia

(A) A–I, B–III, C–II, D–IV 

(B) A–II, B–III, C–IV, D–I 

(C) A–III, B–I, C–IV, D–II 

(D) A–III, B–IV, C–I, D–II

Correct Answer: (C) A–III, B–I, C–IV, D–II

Explanation: The Dodo went extinct in Mauritius. The Quagga (a zebra subspecies) became extinct in Africa. The Thylacine (Tasmanian Tiger) was from Australia. Steller's Sea Cow was hunted to extinction in the waters around Russia (Bering Sea). These are classic CUET PYQ facts. Memorise all four animals and their locations.

Also Check: CUET Biology Important Topics 2027: High Weightage Topics

Q3. In which of the following units is the thickness of the ozone layer measured?

(A) Dobson 

(B) Joule 

(C) Newton

 (D) Decibel

Correct Answer: (A) Dobson

Explanation: The thickness of the ozone layer in the stratosphere is measured in Dobson Units (DU). One Dobson Unit is defined as a layer of ozone that would be 0.01 mm thick under standard conditions of temperature and pressure. The normal ozone layer thickness is about 300 DU. This is a direct CUET PYQ; never confuse it with Joule (energy) or Decibel (sound).

Q4. Ex-situ conservation includes which of the following?

(A) Biosphere reserves 

(B) National parks 

(C) Wildlife sanctuaries

 (D) Seed banks

Correct Answer: (D) Seed banks

Explanation: Ex situ conservation means protecting species outside their natural habitats. This includes seed banks, botanical gardens, zoological parks, and cryopreservation. In-situ conservation, on the other hand, refers to conservation within natural habitats and includes biosphere reserves, national parks, and wildlife sanctuaries. This distinction is heavily tested in CUET every year.

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Q5. Which of the following equations is correct about Verhulst-Pearl Logistic Growth?

(A) dN/dt = (b – d) × (K – N)/K

 (B) dN/dt = rN × (N – K)/K

 (C) dN/dt = rN × (K – N)/K

 (D) dN/dt = (b – d) × (N – K)/K

Correct Answer: (C) dN/dt = rN × (K – N)/K

Explanation: The Verhulst-Pearl Logistic Growth equation is dN/dt = rN (K–N)/K, where N = population size, r = intrinsic rate of natural increase, and K = carrying capacity. When N is much less than K, growth is nearly exponential. As N approaches K, the growth rate slows down and eventually becomes zero. This S-shaped (sigmoid) curve is called logistic growth.

Q6. Two closely related species can co-exist indefinitely and violate Gause's Competitive Exclusion Principle by:

(A) Eliminating the inferior species 

(B) Resource partitioning 

(C) Interacting with each other symbiotically

 (D) Changing the area of grazing

Correct Answer: (B) Resource partitioning

Explanation: Gause's Competitive Exclusion Principle states that two species competing for the same resources cannot coexist indefinitely; one will outcompete and exclude the other. However, if two species evolve to use different parts of the same resource (resource partitioning), they can avoid direct competition and coexist. A classic example is the MacArthur's warbler, which feeds on different parts of the same spruce tree.

Q7. Which of the following gases is found in the Stratosphere?

(A) Ozone

 (B) Carbon dioxide

 (C) Methane

 (D) Hydrogen

Correct Answer: (A) Ozone

Explanation: The stratosphere (15–50 km above Earth) contains the ozone layer, which protects life on Earth from harmful UV-B and UV-C radiation. CFCs (chlorofluorocarbons) released by refrigerants and aerosols rise into the stratosphere and destroy ozone molecules through a catalytic chain reaction. The resulting "ozone hole" has been most severe over Antarctica.

Also Read: How to Prepare for CUET Biology 2027: Tips & Tricks

Q8. Which of the following is an example of In-situ conservation?

(A) Seed bank 

(B) Botanical garden 

(C) Sacred grove

 (D) Zoo

Correct Answer: (C) Sacred grove

Explanation: Sacred groves are patches of forests protected by local communities due to religious or cultural beliefs. They fall under in-situ conservation as species are protected in their natural habitat. India has thousands of sacred groves scattered across states like Rajasthan (orans), Maharashtra (devrais), and Meghalaya. Seed banks, botanical gardens, and zoos are all ex-situ conservation methods.

Q9. The 10% law of energy transfer in a food chain was given by:

(A) Lindeman 

(B) Tansley 

(C) Odum 

(D) Whittaker

Correct Answer: (A) Lindeman

Explanation: Raymond Lindeman proposed the 10% law in 1942, which states that only about 10% of the energy from one trophic level is transferred to the next trophic level. The remaining 90% is lost as heat through metabolic processes. This is why food chains rarely have more than 4–5 trophic levels; too little energy remains at higher levels to sustain life.

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Q10. Which of the following is a Greenhouse gas?

(A) Nitrogen

 (B) Oxygen

 (C) Methane

 (D) Argon

Correct Answer: (C) Methane

Explanation: Greenhouse gases trap heat in the atmosphere and contribute to global warming. The major greenhouse gases include Carbon dioxide (CO₂), Methane (CH₄), Nitrous oxide (N₂O), and Water vapour (H₂O). Nitrogen, Oxygen, and Argon are not greenhouse gases. Methane is approximately 25 times more potent than CO₂ as a greenhouse gas and is released from paddy fields, cattle, and landfills.

Q11. The process of change in species composition over time in an ecosystem is called:

(A) Evolution

 (B) Ecological Succession

 (C) Adaptation

 (D) Speciation

Correct Answer: (B) Ecological Succession

Explanation: Ecological succession is the gradual and predictable process by which communities of organisms change over time. Primary succession occurs in a lifeless area with no soil (like bare rock after a volcanic eruption). Secondary succession begins in an area that previously had life but was disturbed (like a burned forest). The final stable community reached is called the climax community.

Also Read: List of Best Books for CUET Biology Preparation

Q12. Biomagnification refers to the increase in concentration of a pollutant at:

(A) Each successive trophic level

 (B) Each successive habitat

 (C) Producer level only

 (D) Decomposer level only

Correct Answer: (A) Each successive trophic level

Explanation: Biomagnification (also called biological magnification) is the progressive increase in the concentration of a toxic substance (like DDT or mercury) as it moves up successive trophic levels in a food chain. Because organisms at higher trophic levels eat many organisms from lower trophic levels, the toxin accumulates in their body fat. This is why top predators like eagles and sharks have the highest concentrations of toxins.

Q13. Which of the following is NOT a cause of biodiversity loss?

(A) Habitat destruction

 (B) Over-exploitation

 (C) Alien species invasion

 (D) Afforestation

Correct Answer: (D) Afforestation

Explanation: Afforestation (planting trees in deforested areas) actually helps conserve biodiversity by restoring habitats. The four major causes of biodiversity loss are remembered using the acronym HIPPO: Habitat loss and destruction, Invasive alien species, Pollution, Population growth of humans, and Over-exploitation. Deforestation, not afforestation, leads to habitat loss.

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Q14. Which pyramid of ecology is always upright?

(A) Pyramid of Numbers 

(B) Pyramid of Biomass

 (C) Pyramid of Energy

 (D) All of the above

Correct Answer: (C) Pyramid of Energy

Explanation: The Pyramid of Energy is always upright because energy decreases at each successive trophic level due to heat loss. The Pyramid of Number can be inverted (e.g., in a tree → insects → birds chain, one tree supports thousands of insects). The Pyramid of Biomass can also be inverted in aquatic ecosystems where zooplankton biomass exceeds phytoplankton biomass. But energy can never increase going up the food chain.

Q15. The term 'Biodiversity' was popularised by:

(A) Ernst Haeckel (B) Edward Wilson (C) Charles Darwin (D) Robert Whittaker

Correct Answer: (B) Edward Wilson

Explanation: The term "Biodiversity" was popularised by the sociobiologist Edward Wilson in 1986 during the National Forum on Biodiversity in Washington, D.C. He is also considered the father of biodiversity studies. Ernst Haeckel coined the term "Ecology," Robert Whittaker proposed the five-kingdom classification, and Charles Darwin is credited for the theory of Natural Selection.

Q16. Eutrophication of water bodies is mainly caused by excess of:

(A) Carbon and Sulphur 

(B) Nitrogen and Phosphorus 

(C) Iron and Manganese 

(D) Calcium and Magnesium

Correct Answer: (B) Nitrogen and Phosphorus

Explanation: Eutrophication is the process by which a water body becomes overly enriched with nutrients (primarily nitrogen and phosphorus), usually from agricultural runoff containing fertilisers. This leads to excessive algal blooms, which deplete oxygen in the water (hypoxia), kill aquatic life, and render the water body unsuitable for use. Cultural eutrophication is human-induced and is a serious water pollution problem in India.

Check Now: CUET Courses List for Biology Students 2027 – Complete Guide

Q17. Which gas is primarily responsible for the depletion of the ozone layer?

(A) Carbon dioxide 

(B) Sulphur dioxide

 (C) Chlorofluorocarbons (CFCs) 

(D) Nitrous oxide

Correct Answer: (C) Chlorofluorocarbons (CFCs)

Explanation: CFCs, used in refrigerants (freons), aerosol sprays, and foam packaging, are the primary cause of ozone layer depletion. In the stratosphere, UV radiation breaks CFC molecules, releasing chlorine atoms. Each chlorine atom can destroy thousands of ozone (O₃) molecules in a catalytic chain reaction. The Montreal Protocol (1987) is the international agreement to phase out CFC production globally.

Q18. The carrying capacity of a population is represented by which symbol?

(A) r 

(B) N 

(C) K 

(D) b

Correct Answer: (C) K

Explanation: In population ecology, K represents the carrying capacity, the maximum population size that an environment can sustainably support given the available resources (food, space, water). When a population reaches K, growth stops. The symbol 'r' represents the intrinsic rate of natural increase, 'N' represents current population size, and 'b' represents birth rate.

Q19. The Sahyadri range is one of the biodiversity hotspots of India, known as:

(A) Eastern Ghats

 (B) Western Ghats

 (C) Sundarbans

 (D) Gangetic Plains

Correct Answer: (B) Western Ghats

Explanation: India has four biodiversity hotspots: the Western Ghats and Sri Lanka, the Indo-Burma region, the Eastern Himalayas, and Sundaland. The Sahyadri range is the popular name for the Western Ghats, which are home to an extraordinary number of endemic plant, amphibian, reptile, and bird species. The concept of biodiversity hotspots was proposed by Norman Myers in 1988.

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Q20. Primary productivity of an ecosystem depends on:

(A) The availability of nutrients only

 (B) The photosynthetic capacity of producers and the availability of nutrients 

(C) The number of consumers

 (D) The rate of decomposition

Correct Answer: (B) The photosynthetic capacity of producers and the availability of nutrients

Explanation: Primary productivity is the rate at which producers (plants, algae, phytoplankton) fix solar energy through photosynthesis and produce organic matter. It depends on the photosynthetic capacity of producers, availability of solar energy, nutrients (nitrogen, phosphorus), water, and temperature. Gross Primary Productivity (GPP) minus the energy used in plant respiration gives Net Primary Productivity (NPP).

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Q21. Which of the following is an example of mutualism?

(A) Lichens

 (B) Roundworm in the human gut

 (C) Cuckoo laying eggs in a crow's nest 

(D) Clownfish hiding under a sea anemone for protection only

Correct Answer: (A) Lichens

Explanation: Lichens are a classic example of mutualism, a relationship where both species benefit. Lichens are a symbiotic association between algae (which provide food through photosynthesis) and fungi (which provide shelter, moisture, and minerals). Roundworms are parasites. The cuckoo-crow relationship is brood parasitism. Clownfish and sea anemone are a mutualism, but lichens are the textbook NCERT example tested in CUET.

Q22. The species that invades a new area and causes ecological harm is called:

(A) Endemic species 

(B) Keystone species 

(C) Alien invasive species 

(D) Pioneer species

Correct Answer: (C) Alien invasive species

Explanation: Alien invasive species are organisms introduced (intentionally or accidentally) to areas outside their native range that cause ecological, environmental, or economic harm. A classic example is the introduction of the Nile Perch into Lake Victoria, which led to the extinction of over 200 native cichlid species. In India, Parthenium and Lantana are notorious invasive plants.

Also Read: CUET Environmental Science Syllabus 2027

Q23. Which of the following international agreements deals with the phasing out of ozone-depleting substances?

(A) Kyoto Protocol 

(B) Montreal Protocol 

(C) Paris Agreement 

(D) Rio Convention

Correct Answer: (B) Montreal Protocol

Explanation: The Montreal Protocol on Substances that Deplete the Ozone Layer was signed in 1987 and is widely regarded as one of the most successful international environmental agreements. It led to the global phase-out of CFCs and other ozone-depleting substances. The Kyoto Protocol and the Paris Agreement address climate change and greenhouse gas emissions. The Rio Convention (1992) addressed biodiversity conservation.

Q24. The species-area relationship was given by:

(A) Alexander von Humboldt (B) Charles Darwin (C) Norman Myers (D) G.E. Hutchinson

Correct Answer: (A) Alexander von Humboldt

Explanation: Alexander von Humboldt, exploring South America in the early 19th century, first described that, within a region, species richness increases with explored area, but only up to a point. This relationship is expressed as S = CA^Z, where S = species richness, A = area, C = y-intercept, and Z = slope of the line (regression coefficient). The Z value typically ranges from 0.1 to 0.2 for small areas and is higher for larger landmasses.

Q25. The detritus food chain begins with:

(A) Green plants 

(B) Dead organic matter 

(C) Primary consumers

 (D) Sunlight

Correct Answer: (B) Dead organic matter

Explanation: There are two types of food chains in an ecosystem: the Grazing Food Chain (GFC), which begins with green plants (producers), and the Detritus Food Chain (DFC), which begins with dead organic matter (detritus). The DFC is driven by decomposer bacteria and fungi that break down dead matter and return nutrients to the soil. In most terrestrial ecosystems, the DFC processes more energy than the GFC.

Q26. The Biochemical Oxygen Demand (BOD) of water is a measure of:

(A) The amount of dissolved oxygen in water

 (B) The amount of organic pollution in water

 (C) The population of aquatic animals

 (D) The temperature of water

Correct Answer: (B) The amount of organic pollution in water

Explanation: BOD (Biochemical Oxygen Demand) measures the amount of oxygen required by microorganisms to decompose organic matter in a water sample over 5 days at 20°C. Higher BOD indicates more organic pollution and less dissolved oxygen available for aquatic life. Clean water has a BOD of less than 5 mg/L, while heavily polluted water can have a BOD above 17 mg/L. BOD is widely used as an indicator of water quality.

Q27. Which of the following correctly represents a population interaction where one species benefits and the other is neither harmed nor benefited?

(A) Parasitism

 (B) Mutualism

(C) Commensalism 

(D) Predation

Correct Answer: (C) Commensalism

Explanation: In commensalism, one species benefits (+) while the other is neither harmed nor benefited (0). Classic examples include orchids growing on mango trees (the orchid gets support and sunlight; the mango tree is unaffected), barnacles growing on whales, and cattle egrets following grazing cattle to catch insects disturbed by them. This is distinct from mutualism (+/+) and parasitism (+/–).

Check Now: CUET Books 2027: List of Best Books for CUET UG Preparation

Q28. What is the correct sequence of ecological succession on a bare rock?

(A) Lichens → Mosses → Herbs → Shrubs → Trees

 (B) Mosses → Lichens → Trees → Shrubs → Herbs 

(C) Trees → Shrubs → Herbs → Mosses → Lichens

 (D) Herbs → Mosses → Lichens → Shrubs → Trees

Correct Answer: (A) Lichens → Mosses → Herbs → Shrubs → Trees

Explanation: The correct sequence of primary succession on bare rock (called Xerosere) begins with lichens (pioneer community) that break down rock through acid secretion and accumulate organic matter. Mosses replace lichens, followed by herbs, then shrubs, and finally trees (climax community). This process takes hundreds to thousands of years. The sequence is a direct NCERT-based CUET question.

Q29. Which of the following gases contributes most to the enhanced greenhouse effect?

(A) Methane 

(B) Carbon dioxide 

(C) Nitrous oxide

 (D) Water vapour

Correct Answer: (B) Carbon dioxide

Explanation: Although methane is a more potent greenhouse gas molecule-for-molecule, Carbon dioxide (CO₂) contributes the most to the enhanced (human-caused) greenhouse effect because of its much higher concentration in the atmosphere, currently over 420 ppm. CO₂ is released through the burning of fossil fuels, deforestation, and cement production. The rise in CO₂ since the Industrial Revolution is the primary driver of global warming.

Q30. Which of the following is the correct definition of 'alpha diversity'?

(A) Diversity between different ecosystems 

(B) Diversity within a single habitat or community

 (C) Diversity along a geographical gradient

 (D) Diversity at the genetic level

Correct Answer: (B) Diversity within a single habitat or community

Explanation: There are three levels of biodiversity: Alpha diversity refers to diversity within a particular area or ecosystem and is measured by the number of species (species richness) in that habitat. Beta diversity refers to the change in species diversity as you move from one habitat or community to another (diversity between habitats). Gamma diversity refers to the overall diversity of the different ecosystems within a region (landscape diversity).

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What is the Weightage of Ecology and Environment in CUET Biology 2027?

Understanding the CUET Biology, Ecology, and Environment Important Questions and Answers weightage will help you prioritise the topics for your CUET 2027 preparation. Based on analysis of CUET Biology question papers from 2022 to 2024, here is a topic-wise breakdown:

Topic	Expected Questions	Weightage
Organisms and Populations	1–2	3–6%
Ecosystem (Energy Flow, Pyramids, Succession)	1–2	3–6%
Biodiversity and Conservation	1–2	3–6%
Environmental Issues	1–2	3–6%
Total (Ecology & Environment)	5–8	12–18%

This clearly shows that no single sub-topic dominates; questions are spread across all four chapters. That means you must prepare all four NCERT chapters without skipping any. Use the CUET Biology Exam Pattern guide to understand how the entire Biology paper is structured so you can allocate time wisely.

What are the Most Important Topics in CUET Biology Ecology and Environment 2027?

After understanding the CUET Biology Ecology and Environment Important Questions and Answers, it is crucial to know which concepts are non-negotiable. Here is a topic-wise overview:

From Chapter 13 – Organisms and Populations:

• Abiotic factors (temperature, water, light, soil)
• Population attributes: natality, mortality, sex ratio, and age pyramid
• Growth models: Exponential and Logistic (Verhulst-Pearl equation)
• Population interactions: Mutualism, Commensalism, Predation, Competition, Parasitism, Amensalism
• Gause's Competitive Exclusion Principle
• Adaptations in animals and plants

From Chapter 14 – Ecosystem:

• Ecosystem components, biotic and abiotic
• Productivity GPP, NPP, Secondary Productivity
• Energy flow 10% law, food chains, food webs
• Ecological pyramids of number, biomass, and energy
• Nutrient cycling: Carbon cycle, Phosphorus cycle
• Ecological succession: Primary and Secondary
• Ecosystem services

Also Check: CUET Biology Syllabus 2027 Official PDF Download 

From Chapter 15 – Biodiversity and Conservation:

• Types of biodiversity: Genetic, Species, Ecological
• Biodiversity patterns: Latitudinal gradients, Species-area relationships
• Threats to biodiversity: Habitat loss, Over-exploitation, Invasive species, Co-extinctions (HIPPO)
• In-situ conservation: National parks, Wildlife sanctuaries, Biosphere reserves, Sacred groves
• Ex-situ conservation: Zoos, Botanical gardens, Seed banks, Cryopreservation
• Recent extinctions: Dodo, Quagga, Thylacine, Steller's Sea Cow
• Biodiversity hotspots

From Chapter 16 – Environmental Issues:

• Air pollution and its effects
• Water pollution: Eutrophication, Biomagnification, BOD
• Solid waste, E-waste, Biomedical waste
• Ozone layer depletion, CFCs, Montreal Protocol, Dobson units
• Global warming and the greenhouse effect
• Deforestation causes and effects
• Radioactive waste

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Key Concepts in CUET Biology Ecology and Environment Important Questions and Answers 2027

Here are some of the most important revision concepts that you should practice for CUET 2027:

Concept	Key Fact to Remember
10% Law	Lindeman (1942): only 10% of energy is transferred per trophic level
Dobson Unit	Unit for measuring ozone layer thickness
CFCs	The primary cause of ozone depletion; the Montreal Protocol (1987) banned them
Logistic Growth	S-shaped sigmoid curve; formula: dN/dt = rN(K–N)/K
Gause's Principle	Two species competing for the same niche cannot coexist indefinitely
Ex-situ Conservation	Seed banks, zoos, botanical gardens, and cryopreservation
In-situ Conservation	National parks, wildlife sanctuaries, biosphere reserves, and sacred groves
Dodo	Extinct in Mauritius
Quagga	Extinct in Africa
Thylacine	Extinct in Australia
Steller's Sea Cow	Extinct in Russia (Bering Sea)
HIPPO	Causes of biodiversity loss: Habitat loss, Invasive species, Pollution, Population growth, Over-exploitation
Alpha Diversity	Diversity within a habitat
Beta Diversity	Diversity between habitats
Gamma Diversity	Overall landscape diversity
BOD	Measure of organic pollution in water
Eutrophication	Caused by excess nitrogen and phosphorus
Biomagnification	DDT concentration increases up the food chain
Primary Succession	Begins on bare rock Lichens → Mosses → Herbs → Shrubs → Trees
Biodiversity Hotspots	Proposed by Norman Myers, India has 4

Preparation Tips for CUET Biology Ecology and Environment Important Questions and Answers 2027

Knowing the questions is only half the battle. Here is a practical strategy to master this chapter:

Step 1 – Nail the NCERT

Read Chapters 13 to 16 of Class 12 Biology thoroughly. Every diagram, table, and example in NCERT is fair game for CUET. For a complete chapter-by-chapter breakdown, refer to the CUET Biology Syllabus.

Step 2 – Use the Right Books

Beyond NCERT, certain reference books can help you solidify concepts. Check out the recommended CUET Biology Books to know exactly which books to follow without wasting time on unnecessary material.

Step 3 – Practise PYQs Religiously

Previous year question papers are your best friend. Analyse the CUET Biology Question Papers to understand the difficulty level and recurring question types in Ecology and Environment.

Step 4 – Revise with Smart Notes

Making your own short notes or using ready-made revision material saves time during the final stretch. Toprankers' CUET Biology Notes cover all key points in a crisp, exam-ready format.

Step 5 – Focus on High-Weightage Topics

Not all topics deserve equal time. Focus on topics identified in CUET Biology Important Topics to maximise your score within the available preparation time.

Step 6 – Follow a Structured Plan

 A random approach to studying rarely works. Follow a strategic How to Prepare for CUET Biology plan that allocates the right time to each chapter based on its weightage.

Step 7 – Understand the Exam Structure

Knowing how many sections there are, how much time you get, and how negative marking works is essential. Go through the CUET Biology Exam Pattern before your first mock test.

Step 8 – Access All Important Questions

For chapter-wise important questions across all Biology topics, not just Ecology, refer to the complete CUET Biology Important Questions resource.

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What Career Options are Available After Scoring Well in CUET Biology?

Scoring well in CUET Biology opens doors to a wide variety of undergraduate programmes. If Ecology and Environment are your passions, you can explore courses like:

• B.Sc in Environmental Science
• B.Sc in Ecology, B.Sc Zoology
• B.Sc Botany, and B.Sc Biotechnology

For a complete list, check the CUET Courses List for Biology Students and explore CUET Career Options for Biology Students to understand which career paths these courses lead to.

If you are specifically interested in Environmental Science as a domain subject, the CUET Environmental Science Syllabus is a must-read resource, as it overlaps significantly with the Ecology and Environment chapter in Biology.

Conclusion

Ecology and Environment is one of the smartest chapters to invest your time in for CUET Biology 2027. With consistent practice of these important questions for CUET Biology Ecology and Environment, students can easily secure 5 to 8 correct answers from this chapter alone, which translates to 20 to 32 additional marks.

The key is to start with a solid NCERT foundation, identify recurring question patterns in PYQs, and revise with structured notes and quick-revision tables.

Use this blog as a complete revision companion, from understanding the key concepts and weightage to practising 30 important questions with detailed explanations.