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4

An association between two or more species in which both are benefited is known as

A. commensalism

B. symbiosis

C. mutualism

D. cooperation

Correct Answer :

C. mutualism


Related Questions

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4

The energy storage of consumer level is called

A. gross primary productivity

B. net primary productivity

C. secondary productivity

D. none of these

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4

Birth rate under ideal conditions is known as

A. mortality

B. natality

C. both and

D. none of these

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4

The most widespread form of symbiosis in nature is

A. mutualism

B. commensalism

C. predatism

D. parasitism

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4

Animals which live at the bottom of the sea are called

A. leutic

B. benthic

C. pelagic

D. none of these

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A pond is

A. a biome

B. a natural ecosystem

C. an artificial ecosystem

D. a community of plants and animals

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4

An association between two or more species in which both are benefited is known as

A. commensalism

B. symbiosis

C. mutualism

D. cooperation

What is the correct answer?

4

The total interacting animals and plants in any well defined area which as field or a pond is known as

A. biosphere

B. biome

C. community

D. ecosystem

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4

Some animals have a constant high body temperature. This is because

A. they like this temperature

B. they can work fast in the temperature

C. they prefer to live in cold region

D. they are active animals

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4

Ultra-violet radiation from sunlight causes the reaction that produce

A. CO    

B. so2

C. o3

D.
 Fluorides

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4

Trophic levels are formed by

A. plants only

B. animals only

C. organisms linked in food chains

D. all of these

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4

Which of the following is an anti-forest conservation activity ?

A. Economy in timbering

B. Clear falling of trees

C. Prevention of fibres

D. Preservation of wild animals

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4

The term "ecosystem" was first proposed by

A. A.G. Tansely

B. H.T. Odum

C. Karl Mobius

D. None of these

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4

Which is the correct sequence in a food-chain

A. Grass > Wolf �Deer -^Buffalo

B. Grass � Snake �Insect �Deer

C. Grass -�Insect >Birds >Snake

D. Bacteria ->Grass ~>Rabbit -�Wolf

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4

Synecology is the study of

A. environment

B. individual

C. specific species

D. plant community

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Association of a sea-anemone with hermit crab living in a gastropod shell is an example of

A. mutualism

B. commensalism

C. symbiosis

D. parasitism

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Biome is

A. a part of the earth and its atmosphere which inhabits livings organisms

B. a community of organisms interacting with each other

C. the fauna and flora on land

D. the fauna and flora on ocean

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When compared to the trophic level above, the total energy present in any given trophic level is necessarily

A. greater

B. lesser

C. the same

D. very small

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4

Plants growing on sea shores show characters of

A. hydrophytes

B. mesophytes

C. xerophytes

D. halophytes

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4

Trophic levels are formed by

A. plants only

B. animals only

C. carnivorous animals only

D. organisms linked in food-chains

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4

Which of the following atmospheric pollutants is not produced by the exhaust of motor vehicles in Delhi

A.
 Fly ash    

B. so2

C.  Hydrocarbon gases

D. CO

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4

When a big fish eats a small fish, which eats water fleas supported by phyto-plankton, the water-fleas are

A. producers

B. primary consumers

C. secondary consumers

D. top consumers in the food-chain

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Species that occur in different geographical regions separated by special barriers are

A. Allopatric

B. Autogenic

C. Sympatric

D. Allogenic

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The source of energy in an ecosystem is

A. light received from sun

B. heat liberated during respiration

C. heat liberated during fermentation

D. none of these

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4

Smog is a combination of

A. air and water

B. water and smoke

C. smoke and fog

D. fire and water

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4

Animals in cold regions have fur because

A. hair is a good insulating material

B. hairs trap air which acts as insulator

C. they like fur

D. none of these

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4

The most polluted city in the world is

A. Tokyo

B. New York

C. Calcutta

D. Mexico

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4

All the living organisms on earth constitute

A. biome

B. biosphere

C. community

D. population

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4

Silent valley of Kerala is preserved because

A. it contains timber trees

B. it harbours lions

C. it harbours elephants

D. it contains rare animals and plants

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The whale is

A. primary producer

B. carnivorous secondary consumer

C. herbivorous

D. a decomposers

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Pedology is the study of

A. soil

B. rocks

C. animal diseases

D. locomotion of animals