MCQ Questions for Class 12 Biology Chapter 14 Ecosystem

MCQ Questions for Class 12 Biology Chapter 14 Ecosystem

Here we are providing mcq questions for class 12 biology chapter 14 ecosystem. These questions are prepared by subject expert and are based on latest syllabus prescribed by board. Students can practice these questions to score better marks in their exams.

Q.1. Hydrosphere is composed of abiotic and biotic components present in:
(A) Water
(B) Soil
(C) Air
(D) Fire

Answer

Answer: A

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Q.2. Which of the following represents largest man made ecosystem?
(A) Zoo
(B) Garden
(C) Aquarium
(D) Agroecosystem

Answer

Answer: D

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Q.3. Vertical distribution of different species occupying different levels represents:
(A) Standing state
(B) Stratification
(C) Standing crop
(D) Standing quality

Answer

Answer: B

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Q.4. Rate of production of organic matter by producers per unit time and area is:
(A) GPP
(B) NPP
(C) NPP-R
(D) More than one option is correct

Answer

Answer: A

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Q.5. Natural scavengers are:
(A) Phytoplanktons, Zooplanktons
(B) Insects, Birds
(C) Bacteria, Fungi
(D) Lion, Tiger

Answer

Answer: C

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Q.6. For which of the following ecosystem pyramid of number can be both spindle shape and inverted?
(A) Grassland
(B) Pond
(C) Tree
(D) More than one option is correct

Answer

Answer: C

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Q.7. Buildup of organic material in soil is under which of the following conditions?
(A) <10o C temperature, Absence of oxygen
(B) Warm temperature, Humid environment
(C) Aerobic conditions, > 25o
C temperature
(D) Nitrogen rich detritus, Reduce moisture

Answer

Answer: A

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Q.8. Humification results in the formation of ___________ substance
(A) Colloidal, basic
(B) Acidic, Dark coloured
(C) Amorphous, Light coloured
(D) Light coloured, Colloidal

Answer

Answer: B

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Q.9. What percentages of PAR can be captured by plants?
(A) 1-5%
(B) 2-10%
(C) 20%
(D) 50%

Answer

Answer: B

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Q.10. Trees → Birds → Lice → Bacteria. The above food chain is:
(A) Predatory
(B) Grazing
(C) Detritus
(D) Parasitic

Answer

Answer: D

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Q.11. Choose odd one out w.r.t. trophic level.
(A) Mollusca
(B) Tadpole
(C) Hydra
(D) Grasshopper

Answer

Answer: C

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Q.12. Magnitude of primary productivity is affected by:
(A) Temperature, Availability of nutrients.
(B) Solar radiations available, Availability of nutrients
(C) Photosynthetic capacity of producers
(D) All of these

Answer

Answer: D

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Q.13. Choose incorrect option w.r.t. amount of living material present in different trophic levels at a given time:
(A) Can be measured as number
(B) Is equivalent to standing crop
(C) Is always represented as dry weight only
(D) Expressed both as biomass and number

Answer

Answer: C

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Q.14. If 10,000 J of energy fall on place of land, then what is energy available at T2 level?
(A) 1000 J
(B) 10 J
(C) 100 J
(D) 1 J

Answer

Answer: B

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Q.15. Which of the following element is second most critical element after nitrogen?
(A) Phosphorus
(B) Potassium
(C) Sulphur
(D) Oxygen

Answer

Answer: A

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Q.16. Choose odd one out w.r.t. functional aspects of ecosystem.
(A) Energy flow
(B) Decomposition
(C) Species composition
(D) Nutrient cycling

Answer

Answer: C

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Q.17. Major conduit of energy in land and aquatic ecosystem is transferred through and _________ respectively.
(A) GFC, DFC,
(B) PFC, GFC
(C) DFC, GFC
(D) GFC, GFC

Answer

Answer: C

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Q.18. How many types of community groups are present in ecological succession?
(A) Three
(B) Four
(C) Two
(D) Five

Answer

Answer: A

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Q.19. In hydrarch succession, reed swamp stage is preceded by:
(A) Forest community
(B) Scrub stage
(C) Sedge meadow stage
(D) Floating stage

Answer

Answer: D

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Q.20. Ecological succession is and change in species composition
(A) Orderly and sequential
(B) Unpredictable and orderly
(C) Gradual and nonsequential
(D) Sequential and disorderly

Answer

Answer: A

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Q.21. Pioneer community established on a bare rock is:
(A) Mosses
(B) Lichens
(C) Phytoplanktons
(D) Higher plants

Answer

Answer: B

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Q.22. In gaseous cycle:
(A) Nutrient is mineral
(B) Reservoir is lithosphere
(C) Rate of influx and efflux is fast
(D) Withdrawal from reservoir pool is large.

Answer

Answer: C

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Q.23. Carbon constitutes of dry weight of organism and _ percentage is present in oceans out
of total global carbon
(A) 49%, 71%
(B) 71%, 49%
(C) 49%, 49%
(D) 71%, 71%

Answer

Answer: A

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Q.24. Choose incorrect option for the cost distribution of ecosystem services:
(A) Soil formation – 50%
(B) Nutrient cycling >10%
(C) Climate regulation – 6%
(D) Habitat for wildlife – 6%

Answer

Answer: B

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Q.25. Succession proceeds from:
(A) Xeric – Mesic conditions
(B) Hydric – Mesic conditions
(C) Mesic – Xeric conditions
(D) More than one option is correct

Answer

Answer: D

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