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Biology Test Ecosystem II

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Number of Questions: 25
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Tags: Science Biology Medical Entrance MBBS MD AFMC PMT Botany Medical Zoology UPSC B.Sc CBSE Biology Ecosystem CCE CCE Sample Papers Components of Ecosystem Important Components of Ecosystem Ecosystem Levels of Ecological Organisation Levels of Biological Organisation Biomes Levels of Biodiversity Ecology and Environment
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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

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Correct Option: A
Explanation:

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

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

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Correct Option: C
Explanation:

 An ecosystem is an open unit as ecosystems require a continuous flow of high-quality energy to maintain their structure and function.

Pond is an example of

  1. artificial ecosystem

  2. forest ecosystem

  3. natural ecosystem

  4. grassland ecosystem

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Correct Option: A
Explanation:

 Pond is an example of artificial ecosystem.

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

Show answer
Correct Option: B
Explanation:

The correct path of energy flow in an ecosystem is producers – herbivores – carnivores – decomposers.

An ecosystem may be defined as

  1. a localized association of several plants and animals

  2. different communities of plants, animals and microbes, together with their physiochemical environments

  3. different communities of plants and microbes, plus their physio-chemical environments

  4. none of the above

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Correct Option: C

Ecosystem has two components

  1. plants and animals

  2. weeds and trees

  3. biotic and abiotic

  4. frogs and man

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Correct Option: C

The term biosphere is used for the zone of earth, where life exists

  1. on the lithospheric surface

  2. in the hydrosphere

  3. in the lithosphere and hydrosphere

  4. in the lithosphere, hydrosphere and atmosphere

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Correct Option: D

Ecosystem may be defined as

  1. group of plants which act as the energy suppliers

  2. group of organisms which form population

  3. functional unit for ecological studies

  4. none of these

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Correct Option: A

In natural ecosystem, decomposers include

  1. only bacteria and fungi

  2. only microscopic animals

  3. the above two types organism plus macroscopic animals

  4. both (1) and (2)

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Correct Option: A

Nepenthes is a

  1. primary producer

  2. consumer

  3. primary producer and consumer

  4. none of the above

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Correct Option: C

Prairies and steppes are parts of the natural regions called

  1. tropical grasslands

  2. temperate grasslands

  3. prairie grasslands

  4. steppes grasslands

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Correct Option: C

Which one of the following terms does not reflect the idea of ecosystem?

  1. Holocene

  2. Geobiocoenosis

  3. Biosystem

  4. Cherpozem

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Correct Option: D

A habitat of long severe winters and growing season limited to a few months of summer constitutes

  1. savanna ecosystem

  2. taiga ecosystem

  3. tundra ecosystem

  4. none of the above

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Correct Option: B

Competitions for water, minerals, light and space is most severe between two

  1. closely related species occupying the same niche

  2. closely related species occupying the different niche

  3. unrelated species occupying the same niche

  4. species occupying different overlapping

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Correct Option: A

Biosphere refers to

  1. plants of a particular area

  2. plants of world

  3. area occupied by living beings

  4. spherical plants

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Correct Option: C

In an aquatic environment, microscopic animals and plants are collectively known as

  1. commensales

  2. herbivores

  3. fauna and flora

  4. planktons

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Correct Option: D

The sphere of living matter together with water, air and soil on the surface of earth is

  1. lithosphere

  2. biosphere

  3. hydrosphere

  4. atmosphere

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Correct Option: D

If all the people were ________, the earth could have sustained more population.

  1. pure vegetarian

  2. milk drinker and vegetarian

  3. non-vegetarian

  4. dependent upon milk, egg and vegetarian

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Correct Option: D

Which of the following habitats is most unsuitable for primary productivity?

  1. Meadow

  2. Forested river bank

  3. Cave

  4. Pond

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Correct Option: C

Biological equilibrium is the balance between

  1. producers and consumers

  2. producers and decomposers

  3. producers, consumers and decomposers

  4. producers only

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Correct Option: C

Which of the following occurs among the abiotic components in an ecosystem?

  1. Flow of energy

  2. Cycling of materials

  3. Consumers

  4. Flow of energy and cycling of materials

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Correct Option: B

Which of the following characterizes the biomass in an ecosystem?

  1. The biomass of secondary consumers is usually greater than the biomass of primary consumers

  2. The biomass of producers is generally greater than the biomass of primary consumers

  3. The biomass of secondary producers is generally greater than the biomass of primary consumers

  4. No general statement can be made about relative biomass of different ecological groups

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Correct Option: D

The first link of food chain is green plants because

  1. they are widely distributed

  2. they are firmly fixed to soil

  3. they alone have the capacity to fix the atmospheric CO2 in the presence of sun light

  4. there are more herbivorous animals than the carnivorous

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Correct Option: C

A food chain consists of

  1. producers and primary consumers

  2. producers, herbivores and carnivores

  3. producer, consumers and decomposers

  4. producers, carnivores and decomposers

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Correct Option: C

Carnivores are

  1. usually primary consumers

  2. usually secondary consumers

  3. usually secondary or tertiary consumers

  4. usually decomposers rather than consumers

Show answer
Correct Option: C
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