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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

Correct Answer :

D. clay, silt and sand


Related Questions

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A food-chain consists of

A. producer only

B. producers and consumers

C. consumers only

D. decomposers only

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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 first fish that eats upon the planktonic form is

A. carnivore

B. primary consumer

C. secondary consumer

D. decomposers

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

A. Allopatric

B. Autogenic

C. Sympatric

D. Allogenic

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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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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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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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One always finds many more of the prey species than of the predator. This is called a

A. food web

B. pyramid of numbers

C. pyramid of succession

D. none of these

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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 main cause of soil erosion in India is

A. drought

B. heavy rainfall

C. deforestation

D. heavy winds

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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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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

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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4

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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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 whale is

A. primary producer

B. carnivorous secondary consumer

C. herbivorous

D. a decomposers

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Which one is the direct ecological factor ?

A. Soil structure

B. Wind

C. Temperature

D. Climate

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Plants growing on sea shores show characters of

A. hydrophytes

B. mesophytes

C. xerophytes

D. halophytes

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The most widespread form of symbiosis in nature is

A. mutualism

B. commensalism

C. predatism

D. parasitism

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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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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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All the living organisms on earth constitute

A. biome

B. biosphere

C. community

D. population

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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 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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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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Gas liberated in Bhopal gas tragedy was

A. methyl isocyanide

B. phenyl isocyanide

C. ethylene

D. acetylene

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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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Birth rate under ideal conditions is known as

A. mortality

B. natality

C. both and

D. none of these

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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