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4

The most widespread form of symbiosis in nature is

A. mutualism

B. commensalism

C. predatism

D. parasitism

Correct Answer :

B. commensalism


Related Questions

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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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Which of the following is normally not an important atmospheric pollutant

A.  CO    

B. co2

C. so2

D. Hydro-carbon

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Acid rain is

A. limited to industrial areas

B. presence of large quantity of SO^2 in the atmosphere

C. a natural phenomenon

D. presence of CO^2 in the atmosphere

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Gas liberated in Bhopal gas tragedy was

A. methyl isocyanide

B. phenyl isocyanide

C. ethylene

D. acetylene

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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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Desert animals are called

A. arboreal

B. cursorial

C. benthos

D. xeric

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Ultra-violet radiation from sunlight causes the reaction that produce

A. CO    

B. so2

C. o3

D.
 Fluorides

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In a food-chain, the saprophytic organisms are

A. producers

B. consumers

C. predators

D. decomposers

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The soils transported by water are called

A. peat

B. alluvial

C. colluvial

D. none of these

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The whale is

A. primary producer

B. carnivorous secondary consumer

C. herbivorous

D. a decomposers

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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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The total set of feeding relationships in a biotic community is called

A. a food chain

B. trophic levels

C. food webs

D. ecosystem

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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 transitional zone where two different types of communities meet is called the

A. Ecotype

B. Littoral

C. Ecotone

D. Both and

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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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Biological equilibrium is equilibrium among the

A. producers

B. producers and consumers

C. decomposers and producers

D. producers, consumers and decomposers

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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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An organism which lives at the expense of another organism is called

A. predator

B. prey

C. host

D. parasite

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Bio tic factors are

A. chemical factors of soil which affect life

B. physical factors of soil which affect life

C. all living organisms which influence other organisms

D. factors of atmosphere which affect life

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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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Pedology is the study of

A. soil

B. rocks

C. animal diseases

D. locomotion of animals

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The first fish that eats upon the planktonic form is

A. carnivore

B. primary consumer

C. secondary consumer

D. decomposers

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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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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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Synecology is the study of

A. community in relation to environment

B. individuals

C. environment

D. water

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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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4

The main cause of soil erosion in India is

A. drought

B. heavy rainfall

C. deforestation

D. heavy winds

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

A. Allopatric

B. Autogenic

C. Sympatric

D. Allogenic

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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