Ecosystem class 12 chapter 14 MCQ Question and Answer

Ecosystem class 12 chapter 14 English MCQ Question and Answer

Ecosystem class 12 MCQ taken from NCERT Book these are 30 MCQ very Important Practice each question carefully and enhance your knowledge and first give answer at yourself then you can check my answer if your answer is correct so congrats but,if your answer is incorrect so don’t worry you can try again and practice more.

How to get more marks in MCQ

1. Practice Regularly:
   • Practice solving MCQs regularly.
   • Use textbooks, practice papers, and online resources for diverse questions.
2. Time Management:
   • Allocate a specific amount of time to each question.
   • Don’t spend too much time on a single question; move on and return if needed.
3. Read Questions Carefully:
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   • Pay attention to details, qualifiers, and key terms.
4. Elimination Technique:
   • If unsure, use the process of elimination.
   • Eliminate obviously incorrect options to improve your chances of selecting the correct one.
5. Answer the Easy Ones First:
   • Start with questions you find easier.
   • This helps build confidence and saves time for challenging ones later.
6. Review Your Answers:
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   • Check for any errors or misinterpretations.
7. Guess Wisely:
   • If there is no negative marking, make an educated guess.
   • Eliminate obviously wrong options before making a guess.

Ecosystem class 12 MCQ

Question:1What is an ecosystem?

1. a. A single species
2. b. The entire Earth
3. c. A community and its physical environment
4. d. Only living organisms

Question:2 Which of the following is an abiotic component of an ecosystem?

1. a. Plants
2. b. Animals
3. c. Sunlight
4. d. Fungi

Question:3 What is the primary source of energy in most ecosystems?

1. a. Wind
2. b. Sun
3. c. Fossil fuels
4. d. Geothermal energy

Question:4 Which trophic level represents herbivores?

1. a. First trophic level
2. b. Second trophic level
3. c. Third trophic level
4. d. Fourth trophic level

Question:5 What is the role of decomposers in an ecosystem?

1. a. Produce oxygen
2. b. Break down dead organic matter
3. c. Photosynthesis
4. d. Consume other organisms

Question:6 What is the term for the process by which water is released from plant leaves into the atmosphere?

1. a. Transpiration
2. b. Photosynthesis
3. c. Respiration
4. d. Evaporation

Question:7 Which biome is characterized by coniferous trees and cold temperatures?

1. a. Tropical rainforest
2. b. Taiga
3. c. Desert
4. d. Grassland

Question:8 What is the term for the total mass of living organisms in a given area?

1. a. Population density
2. b. Biomass
3. c. Biodiversity
4. d. Energy pyramid

Question:9 Which of the following is an example of a pioneer species in ecological succession?

1. a. Oak tree
2. b. Moss
3. c. Deer
4. d. Rabbit

Question:10 What is the primary role of nitrogen-fixing bacteria in the nitrogen cycle?

1. a. Convert nitrate to nitrogen gas
2. b. Convert nitrogen gas to ammonia
3. c. Convert ammonia to nitrate
4. d. Convert nitrogen gas to nitrate

Question:11 Which of the following is a greenhouse gas?

1. a. Oxygen
2. b. Nitrogen
3. c. Carbon dioxide
4. d. Hydrogen

Question:12 What is the term for the variety of species in an ecosystem?

1. a. Biomass
2. b. Biodiversity
3. c. Biome
4. d. Biogeochemical cycle

Question:13 Which of the following is an example of a detritivore?

1. a. Lion
2. b. Earthworm
3. c. Rabbit
4. d. Deer

Question:14 What is the main function of the ozone layer in the atmosphere?

1. a. Trap heat
2. b. Absorb ultraviolet radiation
3. c. Produce oxygen
4. d. Facilitate photosynthesis

Question:15 What is the primary role of mycorrhizal fungi in plant ecosystems?

1. a. Parasitize plants
2. b. Fix nitrogen
3. c. Aid in nutrient absorption
4. d. Conduct photosynthesis

Question:16 Which of the following is an example of a keystone species?

1. a. Deer
2. b. Wolves
3. c. Grasshoppers
4. d. Oak trees

Question:17 What is the term for the process by which water is taken up by plant roots and released into the atmosphere?

1. a. Transpiration
2. b. Precipitation
3. c. Runoff
4. d. Condensation

Question:18 Which of the following is a primary consumer in an aquatic ecosystem?

1. a. Fish
2. b. Zooplankton
3. c. Phytoplankton
4. d. Algae

Question:19 In which biome would you find permafrost?

1. a. Tundra
2. b. Rainforest
3. c. Desert
4. d. Grassland

Question:20 What is the term for the process by which bacteria convert ammonia to nitrate in the nitrogen cycle?

1. a. Nitrification
2. b. Nitrogen fixation
3. c. Denitrification
4. d. Ammonification

Question:21 Which of the following is a biotic factor in an ecosystem?

1. a. Temperature
2. b. Soil type
3. c. Plants
4. d. Sunlight

Question:22 What is the role of detritivores in an ecosystem?

1. a. Produce oxygen
2. b. Break down dead organic matter
3. c. Consume other organisms
4. d. Fix nitrogen

Question:23 In which trophic level would you find carnivores?

1. a. First trophic level
2. b. Second trophic level
3. c. Third trophic level
4. d. Fourth trophic level

Question:24 What is the primary source of energy for chemosynthetic organisms in deep-sea ecosystems?

1. a. Sunlight
2. b. Hydrothermal vents
3. c. Oxygen
4. d. Phytoplankton

Question:25 Which of the following is an example of a decomposer in an ecosystem?

1. a. Earthworm
2. b. Mushroom
3. c. Deer
4. d. Grasshopper

Question:26 What is the term for the process by which water vapor condenses to form clouds?

1. a. Precipitation
2. b. Transpiration
3. c. Condensation
4. d. Evaporation

Question:27 Which of the following is a human activity that contributes to the greenhouse effect?

1. a. Planting trees
2. b. Using renewable energy
3. c. Burning fossil fuels
4. d. Recycling

Question:28 The average efficiency of energy transfer from herbivores to carnivores level is.

1. 5%
2. 10%
3. 20%
4. 30%

Question:29 In the phosphorus cycle, weathering makes phosphate available first to.

1. Producers
2. Decomposers
3. Consumers
4. None of these

Question:30 which types of the following pyramid are never inverted ?

1. Pyramid of energy
2. pyramid of biomass
3. pyramid of number
4. pyramid of dry biomass

MCQ Answers

Question No	Answer	Question No	Answer
1	C	16	B
2	C	17	A
3	B	18	B
4	B	19	A
5	B	20	A
6	A	21	C
7	B	22	B
8	B	23	C
9	B	24	B
10	B	25	B
11	C	26	C
12	B	27	C
13	B	28	B
14	B	29	A
15	C	30	A

Read Also

1. Chapter 1: Reproduction in Organisms class 12 MCQ
2. Chapter 2: Sexual Reproduction Flowering plants class 12 MCQ
3. Chapter 3: Human Reproduction class 12 MCQ
4. Chapter 4: Reproductive Health class 12 MCQ
5. Chapter 5: Principles of Inheritance and Variation class 12 MCQ
6. Chapter 6: Class 12 biology molecular basis of inheritance MCQ

Conclusion

In conclusion, mastering MCQs in the Ecosystem chapter of Class 12 involves thorough subject understanding, regular practice, and strategic exam techniques. Focus on key concepts, practice diverse question types, manage time effectively, and stay calm during the exam. With consistent preparation, you can confidently approach MCQs and secure better marks.