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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

Correct Answer :

C. organisms linked in food chains


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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4

Soil particles are arranged in order of increasing size are

A. sand, silt and clay

B. silt, sand and clay

C. clay, sand and silt

D. clay, silt and sand

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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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4

The most polluted city in the world is

A. Tokyo

B. New York

C. Calcutta

D. Mexico

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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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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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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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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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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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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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The first fish that eats upon the planktonic form is

A. carnivore

B. primary consumer

C. secondary consumer

D. decomposers

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In an ecosystem the population of

A. primary producers is larger than that of primary consumers

B. secondary consumers is the largest because they are most powerful

C. primary consumers is the least dependent upon primary producers.

D. primary consumers outnumber primary producers

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Desert animals are called

A. arboreal

B. cursorial

C. benthos

D. xeric

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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 main cause of soil erosion in India is

A. drought

B. heavy rainfall

C. deforestation

D. heavy winds

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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

Gas liberated in Bhopal gas tragedy was

A. methyl isocyanide

B. phenyl isocyanide

C. ethylene

D. acetylene

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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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Plants growing on sea shores show characters of

A. hydrophytes

B. mesophytes

C. xerophytes

D. halophytes

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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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Which of the following is normally not an important atmospheric pollutant

A.  CO    

B. co2

C. so2

D. Hydro-carbon

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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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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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In a food-chain, the saprophytic organisms are

A. producers

B. consumers

C. predators

D. decomposers

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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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Which one is the direct ecological factor ?

A. Soil structure

B. Wind

C. Temperature

D. Climate

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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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Synecology is the study of

A. environment

B. individual

C. specific species

D. plant community

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All the living organisms on earth constitute

A. biome

B. biosphere

C. community

D. population

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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