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Class 12 Biology Objective In English Chapter – 14 Ecosystems
1. A lake ecosystem is
( A ) artificial
( B ) abiotic
( C ) natural
( D ) water bodies
Ans-( D )
2. The correct sequence of a common food-chain is
( A ) Grass – Goat – Man
( B ) Goat Grass – Man
( C ) Man Goat Grass
( D ) None of above
Ans-( A )
3. The highest number of which of the following is in a food-chain ?
( A ) Producer
( B ) Primary consumer
( C ) Secondary consumer
( D ) Decomposer
Ans-( A )
4. The pyramid of number in a forest Ecosystem is
( A ) Upright
( B ) Inverted
( C ) Both
( D ) None
Ans-( B )
5. Treeless genome is called
( A ) Tundra
( B) deserts
(C) Grassland
(D) All of above
Ans-( D )
6. The energy flow of food chain in an ecosystem is
(A) Unidirectional
(B) Bidirectional
(C) Multidirectional
(D ) None of above
Ans-( A )
7. which in the following is Hydrophyte?
(A) Singhara
(B) Opuntia
(C) Sesame
(D) Acacia
Ans-( A )
8. Which in the following is the insectivorous plant ?
(A) Drosera
(B) Nepenthes
(C) Both (A) and (B)
(D) Hydrilla
Ans-( C )
9. If co, is removed from biosphere then the first bad impact will be on which organisms :
(A) Primary Producer
(B) Primary consumer
(C) Secondary consumer
(D) Tertiary consumer
Ans-( A )
10. The term ‘Ecosystem’ was proposed by :
(A) Gardener
(B) Odum
(C) Tansley
(D) Warming
Ans-( C )
11. Controlling factor in ecosystem is :
(A) Soil moisture
(B) Food
(C) Predation
(D) Temperature
Ans-( C )
12. Bacteria and Fungi are :
(A) Scavengers
(B) Primary consumers
(C) Secondary consumers
(D) Decomposers
Ans-( C )
13. Decomposers are :
( A ) Animalia and Morera
( B ) Protista and Animalia
( C ) Fungi and Plantae
( D ) Bacteria and Fungi
Ans-( D )
14. In a biotic community primary consumers are :
(A) Carnivores
(B) Detrivores
(C) Herbivores
(D) Omnivores
Ans-( C )
15. What will happen if decomposers will be destroyed from the ecosystem?
(A) Energy flow will stop
(B) Flow of minerals will stop
(C) Rate of decomposition will increase
(D) Photosynthesis will stop
Ans-( B )
16. The trophical evergreen forest is
found in :
(A) Himalaya
(B) Western Ghat
(C) Arawali
(D) Assam
Ans-( B )
17. Pyramid of Energy is
(A) Always upright
(B) Always inverted
(C) Both upright & inverted
(D) Spindle-shaped
Ans-( A )
18. The driving force for an ecosystem is
(A) Producers
(B) Biomass
(C)Carbohydrates present in producers
(D)Solar energy
Ans-( D )
19. Carnivores represent :
(A) Primary consumers
(B) Secondary and Tertiary consumers
(C) Secondary consumers
(D ) Primary producers
Ans-( B )
20. Which in the following has maximum Biomass ?
(A) Temperate forest
(B) Tropical rain forest
(C) Alpine vegetation
(D) Taiga
Ans-( B )
