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Ecosystem (Class - XII)

Test your knowledge of ecosystem concepts including structure, function, energy flow, succession, and ecological relationships

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

What is the ecological behaviour in which the animals inhabit the trees called?

  1. Arboreal
  2. Terrestrial
  3. Cosmopolitan
  4. Crepuscular
Question 2 Multiple Choice (Single Answer)

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

  1. Secondary production (SP)
  2. Tertiary production (TP)
  3. Gross production (GP)
  4. Net production (NP)
Question 3 Multiple Choice (Single Answer)

Which of the following statements are true about planktons?

A. They are drifting organisms.
B. They have no locomotory organs.
C. They may be found on the surface or in deep waters.
D. They are mostly pelagic plants and animals.
E. They also include some small fishes.

  1. A, B and D
  2. Only B and E
  3. C, D and E
  4. A, B and E
Question 4 Multiple Choice (Single Answer)

What is the correct sequence of ecological complexities?

  1. Biosphere, community, ecosystem, niche
  2. Community, niche, biosphere, ecosystem
  3. Niche, community, ecosystem, biosphere
  4. Ecosystem, biosphere, niche, community
Question 5 Multiple Choice (Single Answer)

The term ecosystem was given by

  1. Odum
  2. Karl Mobius
  3. Tansley
  4. Haeckel
Question 6 Multiple Choice (Single Answer)

Which of the following types of successions occurs in an environment having the substrate devoid of vegetation?

  1. Primary succession
  2. Secondary succession
  3. Allogenic succession
  4. Autogenic succession
Question 7 Multiple Choice (Single Answer)

The number of primary producers within a specified area would be maximum in a

  1. pond ecosystem
  2. grassland ecosystem
  3. desert ecosystem
  4. forest ecosystem
Question 8 Multiple Choice (Single Answer)

An ecosystem is

  1. either open or closed unit, depending upon the biomass present
  2. a closed unit
  3. an open unit
  4. either open or closed unit, depending upon community type
Question 9 Multiple Choice (Single Answer)

Pond is an example of

  1. artificial ecosystem
  2. forest ecosystem
  3. natural ecosystem
  4. grassland ecosystem
Question 10 Multiple Choice (Single Answer)

Which of the following can be threats to the biodiversity of a geographical area?

  1. Global warming
  2. Fragmentation of habitat
  3. Invasion of alien species
  4. Promotion of vegetarianism
  1. 1, 2 and 3
  2. 2 and 3
  3. 1 and 4
  4. 1, 2, 3 and 4
Question 11 Multiple Choice (Single Answer)

Directions: The question consists of two statements : Assertion and Reason. While answering the question you are required to choose any one of the following five responses.

(A) If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(B) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
(C) If assertion is true but the Reason is false.
(D) If Assertion is false and Reason is true.
(E) If both Assertion and Reason are false.

Assertion: Carbon cycle is a self-regulated feedback system.
Reason: Increasing CO2 may disturb the climatic conditions of the world.

  1. (A)
  2. (B)
  3. (C)
  4. (D)
  5. (E)
Question 12 Multiple Choice (Single Answer)

Match the type of speciation given in Column I with its characteristic given in Column II.

 
Column I Column II
A. Allopatric speciation i. Formed due to several ecotypes having different adaptations
B. Sympatric speciation ii. Formed due to genetic drift and natural selection
C. Adaptive radiation iii. New species from spatially isolated populations
D. Gradual speciation iv. Formed due to sudden appearance of reproductive isolation
  1. A – iv, B – iii, C – ii, D – i
  2. A – ii, B – iii, C – iv, D – i
  3. A – iii, B – ii, C – iv, D – i
  4. A – iii, B – iv, C – i, D – ii
  5. A – i, B – iii, C – ii, D – iv
Question 13 Multiple Choice (Single Answer)

Directions: The question consists of two statements : Assertion and Reason. While answering the question you are required to choose any one of the following five responses.

(A) If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(B) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
(C) If Assertion is true but the Reason is false.
(D) If Assertion is false and Reason is true.
(E) If both Assertion and Reason are false.

Assertion: Pyramid of energy is always upright.
Reason: Loss of energy always takes place from lower trophic level to higher trophic level.

  1. (A)
  2. (B)
  3. (C)
  4. (D)
  5. (E)
Question 14 Multiple Choice (Single Answer)

Match the ecological terms in Column I with their characteristics given in Column II.

 
Column I Column II
A. Cline i. It is an assemblage of closely related interbreeding individuals of a species.
B. Biotype ii. Transient population between species having same genotypes and species having different genotypes
C. Ecotype iii. Group of individuals of a species having same genotype
D. Deme iv. Genetically different populations of a species colonising different specific habitat
  1. A – iv, B – iii, C – ii, D – i
  2. A – ii, B – iii, C – iv, D – i
  3. A – iii, B – ii, C – iv, D – i
  4. A – iii, B – iv, C – i, D – ii
  5. A – i, B – iii, C – iv, D – ii
Question 15 Multiple Choice (Single Answer)

The correct path of energy flow in an ecosystem is

  1. producers – carnivores – herbivores – decomposers
  2. producers – herbivores – carnivores – decomposers
  3. herbivores – carnivores – producers – decomposers
  4. herbivores – producers – carnivores – decomposers
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