Ecosystem MCQ Questions & Answers in Botany

31. Niche of a species in an ecosystem refers to its

A function at its place of occurrence

B place of its occurrence

C competitive ability

D centre of origin

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32. Study the four statements (i-iv) given below and select the two correct ones out of them:
(i) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers
(ii) Predatorstar fish Pisaster helps in maintaining species diversity of some invertebrates
(iii) Predators ultimately lead to the extinction of prey species
(iv) Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders
The two correct statements are:

A (ii) and (iii)

B (iii) and (iv)

C (i) and (iv)

D (i) and (ii)

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33. The greatest biomass of autotrophs in the oceans is that of

A sea grasses and slime moulds

B free floating microalgae, cyanobacteria and nanoplankton

C benthic brown algae,coastal red algae and daphnids

D benthic diatoms and marine viruses

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34. Increase in concentration of the toxicant at successive trophic levels is known as :

A Biodeterioration

B Biotransformation

C Biogeochemical

D Biomagnification

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35. Pyramid of numbers in a grassland/true ecosystem is

A always inverted

B always upright

C both A and B

D spindle-shaped

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36. The rate at which light energy is converted to the chemical energy of organic molecules is the ecosystem's

A net primary productivity

B gross primary productivity

C net secondary productivity

D gross secondary productivity

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37. Which of the following would appear as the pioneer organisms on bare rocks?

A Lichens

B Liverworts

C Mosses

D Green algae

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38. Pneumatophores are characteristic of plants growing in

A saline soils

B sandy soils

C marshy places and salt lakes

D dryland regions

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39. An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having

A low stability and high resilience

B high stability and low resilience

C low stability and low resilience

D high stability and high resilience

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40. 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

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31. Niche of a species in an ecosystem refers to its

33. The greatest biomass of autotrophs in the oceans is that of

34. Increase in concentration of the toxicant at successive trophic levels is known as :

35. Pyramid of numbers in a grassland/true ecosystem is

36. The rate at which light energy is converted to the chemical energy of organic molecules is the ecosystem's

37. Which of the following would appear as the pioneer organisms on bare rocks?

38. Pneumatophores are characteristic of plants growing in

39. An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having

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

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