Ecosystem MCQ Questions for Class 12 Biology Chapter 14 with Answers

Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Biology book Chapter 14 Ecosystem with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Ecosystem. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.


NCERT MCQ Chapters for Class 12 Biology

Q1. The second stage of hydrosere is occupied by plants like

(i) Azolla
(ii) Typha
(iii) Carex
(iv) Vallisneria.

(iv) Vallisneria.


Q2. River water deposits

(i) loamy soil
(ii) alluvial soil
(iii) laterite soil
(iv) sandy soil

(ii) alluvial soil


Q3. Which of the following is not a producer?

(i) Spirogyra
(ii) Agaricus
(iii) Volvox
(iv) Nostoc.

(ii) Agaricus


Q4. Which of the following statements is correct for secondary succession?

(i) It begins on a bare rock.
(ii) It occurs on a deforested area.
(iii) It follows primary succession.
(iv) It is similar to primary succession, but has a relatively fast pace.

(iv) It is similar to primary succession, but has a relatively fast pace.


Q5. In lithosere, foliose lichens make the conditions favourable for the growth of

(i) crustose lichens
(ii) mosses
(iii) annual grasses
(iv) perennial grasses.

(ii) mosses


Q6. Flow of energy in our ecosystem takes place

(i) only in one direction
(ii) possible in two directions
(iii) in three dimensions
(iv) may occur in multiple directions

(i) only in one direction


Q7. An inverted pyramid of biomass can be found in which ecosystem?

(i) Forest
(ii) Marine
(iii) Grassland
(iv) Tundra.

(ii) Marine


Q8. Which of the following is a pioneer species in xerarch succession?

(i) Phytoplanktons
(ii) Lichens
(iii) Bryophytes
(iv) Sedges

(ii) Lichens


Q9. The rate of conversion of light energy into chemical energy of organic molecules in an ecosystem is

(i) net primary productivity
(ii) gross primary productivity
(iii) secondary productivity
(iv) gross secondary productivity.

(ii) gross primary productivity


Q10. The common nitrogen-fixer in paddy fields is

(i) Rhizobium
(ii) Azospirillum
(iii) Frankia
(iv) Oscillatoria

(ii) Azospirillum


Q11. The process of mineralisation by micro organisms helps in the release of:

(i) inorganic nutrients from humus
(ii) both organic and inorganic nutrients from detritus
(iii) organic nutrients from humus
(iv) inorganic nutrients from detritus and formation of humus.

(i) inorganic nutrients from humus


Q12. In a pond ecosystem, the food chain starts with

(i) Zooplanktons.
(ii) Small insects
(iii) Phytoplanktons
(iv) Small fishes

(iii) Phytoplanktons


Q13. The rate of formation of new organic matter by rabbit in a g rassland, is called

(i) net productivity
(ii) secondary productivity
(iii) net primary productivity
(iv) gross primary productivity

(ii) secondary productivity


Q14. Breakdown of detritus by microbial enzymes into simple forms is called?

(i) Mineralization
(ii) Fragmentation
(iii) Catabolism
(iv) Leaching

(ii) Fragmentation


Q15. Which of the following ecosystems is most productive in terms of net primary production?

(i) Deserts
(ii) Tropical rainforests
(iii) Oceans
(iv) Estuaries.

(ii) Tropical rainforests


Q16. The reservoir for the gaseous type of biogeochemical cycle exists in

(i) stratosphere
(ii) atmosphere
(iii) ionosphere
(iv) lithosphere

(ii) atmosphere


Q17. About 71 % of total global carbon is found in

(i) Oceans
(ii) Forests
(iii) grasslands
(iv) agroecosystems.

(i) Oceans


Q18. In a biotic community, the most important factor for survival of an animal is

(i) day length
(ii) soil moisture
(iii) green food
(iv) predators

(iii) green food


Q19. Pyramid of numbers is:

(i) Always upright
(ii) Always inverted
(iii) Either upright or inverted
(iv) Neither upright nor inverted.

(iii) Either upright or inverted


Q20. Which of the following ecosystems is most productive in terms of net primary production?

(i) Deserts
(ii) Tropical rain forests
(iii) Oceans
(iv) Estuaries

(ii) Tropical rain forests


Q21. What percentage of total global carbon is atmospheric carbon ?

(i) 0.03%
(ii) 1%
(iii) 10%
(iv) 30%

(ii) 1%


Q22. Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?

(i) Less than 1%
(ii) 2-10%
(iii) 30%
(iv) 50%.

(ii) 2-10%


Q23. Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?

(i) Less than 1%
(ii) 2-10%
(iii) 30%
(iv) 50%

(ii) 2-10%


Q24. Climax community is in a state of

(i) non-equilibrium
(ii) equilibrium
(iii) disorder
(iv) constant change.

(ii) equilibrium


Q25. The pyramid which cannot be inverted in a stable ecosystem is that of

(i) Biomass
(ii) Number
(iii) Energy
(iv) All the above

(iii) Energy


Q26. How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?

(i) 1%
(ii) 10%
(iii) 40%
(iv) 90%.

(ii) 10%


Q27. Vertical distribution of different species occupying different levels in dense vegetation is called

(i) stratification
(ii) species composition
(iii) standing crop
(iv) trophic structure

(i) stratification


Q28. Which one of the following ecosystem types has the highest annual net primary productivity?

(i) tropical deciduous forest
(ii) temperate evergreen forest
(iii) temperate deciduous forest
(iv) tropical rain forest

(iv) tropical rain forest


Q29. The reservoir for the gaseous type of bio-geochemical cycle exists in

(i) stratosphere
(ii) atmosphere
(iii) ionosphere
(iv) lithosphere.

(ii) atmosphere


Q30. Edaphic factor refers to

(i) water
(ii) soil
(iii) relative humidity
(iv) altitude.

(ii) soil


Q31. Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem?

(i) Secondary Production
(ii) Tertiary Production
(iii) Gross Production (GP)
(iv) Net Production (NP)

(iii) Gross Production (GP)


Q32. Which of the following types of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100 mm.

(i) Grassland
(ii) Shrubby forest
(iii) Desert
(iv) Mangrove.

(iii) Desert


Q33. Term ‘ecosystem’ was coined by

(i) Odum
(ii) Tansley
(iii) Lindeman
(iv) Elton.

(ii) Tansley


Q34. Which of the following is the most stable ecosystem?

(i) Forest
(ii) Desert
(iii) Mountain
(iv) Ocean

(iv) Ocean


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