B.Sc.Part I : Botany SEMESTER –II Botany Paper III: DSC- 13 B: PLANT ECOLOGY

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TEST 3 Unit 2: Ecosystem

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Ecosystem may be defined as

2 分

A species along with environment

Plants found in water

Plants found on land

Call plants and animals species along with environment

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A pond / lake is

2 分

A biome

Unnatural ecosystem

An artificial ecosystem

Community of plants and animals only

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Biome is

2 分

The fauna of an ocean

The Flora of land

Communities of organisms interacting with one another

The part of the earth and its atmosphere which is inhabited by living organisms

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Grassland biome for its maintenance requires

2 分

Periodic fire

Intensive grazing

Mowing

All the above

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Primary consumers in the detritus food chain are

2 分

Herbivorous

Bacteria and fungi

Insect Larva, nematodes

All the above

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Total organic matter present in an ecosystem is called

2 分

Biomass

Biome

Litter

None of these

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Detritus food chain in comparison to grazing food chain is

2 分

Generally longer

Generally equal

Generally shorter

None of these

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Putrefying organisms are

2 分

Producer

Reducer

Consumer

Parasitic

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The most important organisms for an ecosystem are

2 分

Herbivorous

Carnivorous

Green plants

Protozoa

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A peacock eats snakes which eat frog these eat hoppers which in turn thrive on leaves of the plants, the peacock is

2 分

Primary consumer

Secondary consumer

Decomposer

Apex of the food pyramid

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A food chain is

2 分

Group of organisms which eat the same type of food

Animals eating animals eating

Series of plants / animals which are interrelated in the form of organisms being eaten as food by the other

None of these

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A food chain consists of

2 分

Producers

Consumers

Decomposers

Producers and Consumers

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Trophic leaves in a food chain are formed by

2 分

Producers

Consumers

Decomposers

All the above

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Food chain always starts with

2 分

Photosynthesis

Respiration

Nitrogen fixation

Decay

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Primary consumers are

2 分

Green plants

Herbivorous

Carnivorous

All the above

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