Ecosystem MCQ Questions for Class 12 Biology Chapter 14 with Answers

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NCERT MCQ Chapters for Class 12 Biology


Q1. Vertical distribution of different species occupying different levels in dense vegetation is called

(A) stratification
(B) species composition
(C) standing crop
(D) trophic structure


(A) stratification


Q2. The second stage of hydrosere is occupied by plants like

(A) Azolla
(B) Typha
(C) Carex
(D) Vallisneria.


(D) Vallisneria.


Q3. Which of the following is the most stable ecosystem?

(A) Forest
(B) Desert
(C) Mountain
(D) Ocean


(D) Ocean


Q4. River water deposits

(A) loamy soil
(B) alluvial soil
(C) laterite soil
(D) sandy soil


(B) alluvial soil


Q5. Term ‘ecosystem’ was coined by

(A) Odum
(B) Tansley
(C) Lindeman
(D) Elton.


(B) Tansley


Q6. Which of the following is not a producer?

(A) Spirogyra
(B) Agaricus
(C) Volvox
(D) Nostoc.


(B) Agaricus


Q7. Which of the following types of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100 mm.

(A) Grassland
(B) Shrubby forest
(C) Desert
(D) Mangrove.


(C) Desert


Q8. Which of the following statements is correct for secondary succession?

(A) It begins on a bare rock.
(B) It occurs on a deforested area.
(C) It follows primary succession.
(D) It is similar to primary succession, but has a relatively fast pace.


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


Q9. Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem?

(A) Secondary Production
(B) Tertiary Production
(C) Gross Production (GP)
(D) Net Production (NP)


(C) Gross Production (GP)


Q10. In lithosere, foliose lichens make the conditions favourable for the growth of

(A) crustose lichens
(B) mosses
(C) annual grasses
(D) perennial grasses.


(B) mosses


Q11. Edaphic factor refers to

(A) water
(B) soil
(C) relative humidity
(D) altitude.


(B) soil


Q12. Flow of energy in our ecosystem takes place :

(A) only in one direction
(B) possible in two directions
(C) in three dimensions
(D) may occur in multiple directions


(A) only in one direction


Q13. The reservoir for the gaseous type of bio-geochemical cycle exists in

(A) stratosphere
(B) atmosphere
(C) ionosphere
(D) lithosphere.


(B) atmosphere


Q14. An inverted pyramid of biomass can be found in which ecosystem?

(A) Forest
(B) Marine
(C) Grassland
(D) Tundra.


(B) Marine


Q15. Which one of the following ecosystem types has the highest annual net primary productivity?

(A) tropical deciduous forest
(B) temperate evergreen forest
(C) temperate deciduous forest
(D) tropical rain forest


(D) tropical rain forest


Q16. Which of the following is a pioneer species in xerarch succession?

(A) Phytoplanktons
(B) Lichens
(C) Bryophytes
(D) Sedges


(B) Lichens


Q17. The reservoir for the gaseous type of biogeochemical cycle exists in

(A) stratosphere
(B) atmosphere
(C) ionosphere
(D) lithosphere.


(B) atmosphere


Q18. The rate of conversion of light energy into chemical energy of organic molecules in an ecosystem is

(A) net primary productivity
(B) gross primary productivity
(C) secondary productivity
(D) gross secondary productivity.


(B) gross primary productivity


Q19. How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?

(A) 1%
(B) 10%
(C) 40%
(D) 90%.


(B) 10%


Q20. The common nitrogen-fixer in paddy fields is

(A) Rhizobium
(B) Azospirillum
(C) Frankia
(D) Oscillatoria


(B) Azospirillum


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