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4

First link in any food chain is green plant because

A. green plants systhesize food

B. the green plants eat everything

C. they are fixed at a place

D. none of these

Correct Answer :

A. green plants systhesize food


Related Questions

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When young plants are grazed too heavily they get killed because

A. the roots are starved

B. of the mechanical injury to roots

C. most of the aerial parts are eaten away

D. of the mechanical injury to branches

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4

First link in any food chain is green plant because

A. green plants systhesize food

B. the green plants eat everything

C. they are fixed at a place

D. none of these

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4

Biosphere is:

A. In which individuals interact with each other

B. In which life originated

C. The name of a bird

D. Organic compound by which life diminih

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The ultimate source of energy for fish is

A. Protozoa

B. Oxygen produced by plants

C. Sunlight

D. Manure in the soil

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One of these is a renewable source of energy:

A. Solar energy

B. Hydro-power

C. Natural gas

D. All of these

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An American plant which had become a troublesome weed in India is

A. Typha latifolia

B. Cyperus rotundus

C. Parthenium

D. Eichhornia

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The biggest herbarium of India is

A. Botanical Survey of India - Calcutta

B. St. Xavier's Herbarium - Mumbai

C. Central National Herbarium - Calcutta

D. IARI - New Delhi

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Desert plants are generally

A. Succulents

B. Heterophyllous

C. Herbaceous

D. Viviparous

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Humus is an example of

A. soil structure

B. organic colloids

C. crystalloids

D. none of the above

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Which one of the following is associated with the conservation of forest ?

A. Bharatpur

B. Kaziranga

C. Silent Valley

D. Gir

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Smog is a common pollutant in places having

A. excessive so2 in their air

B. excessive ammonia in the air

C. low temperature

D. high temperature

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  Which of the following is normally not at atmospheric pollutant

A. CO    

B. so2

C. co2

D.  Hydrocarbons

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. Biome is

A. the flora on land

B. the flora in ocean

C. a community of organisms interacting with each other

D. that part of earth and its atmosphere which inhabits living organisms

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A habitat of long severe winters and growing season limited to a few months of summer constitutes

A. Taiga ecosystem

B. Tundra ecosystem

C. Savannah ecosystem

D. Tropical rainforest

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Increasing accumulation of DDT in organisms of a food chain in higher trophic levels is known as

A. biotic potential

B. biotic component

C. biological value

D. biological amplification

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Tropical evergreen forests are seen in

A. Himachal Pradesh

B. Haryana

C. Tamil Nadu

D. Assam

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Deforestation may reduce the chances of

A. frequent cyclones

B. rainfall

C. frequent landslides

D. erosion of soil surface

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Biologists celebrate 5th June as

A. Darwin's birthday

B. World hygiene day

C. World environment day

D. World population day

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Plankton, Nekton and Itenthon are not the components of one of the following ecosystems:

A. Marine

B. Freshwater

C. Grassland

D. Pond

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Hie sequence blue green algae > crustose lichens � foliose lichens > mosses � shrubs � dicotyledonous tree represents

A. a food chain

B. genetic drift

C. ecological succession trend

D. a phylogenetic trend

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Pedology is the study of

A. soil

B. locomotion of animals

C. rocks

D. crop diseases

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The best indicator of SO^2 pollution is

A. Lichens

B. Algae

C. Fungus

D. Fems

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Hydrilla is a

A. suspended hydrophyte

B. submerged hydrophyte

C. floating and anchored plant

D. a free floating hydrophyte

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Water plants usually have

A. a well developed root system

B. a well developed vascular system

C. a well developed stomatal system

D. a reduced vascular system

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Soil particles 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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Commensalism is

A. when both organisms are benefited

B. when one organism is benefited without affecting the other

C. when one organism is affected

D. when both organisms are affected

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Mark which is true

A. A food chain is a chain of food consumers

B. A food chain is chain of food producers

C. A food chain is a series of organisms through which food energy flows in an ecosystem

D. None of the above

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Laterization is a process which results in the

A. purification of water

B. formation of soil

C. sterilization of soil

D. degradation of soil

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What is the major constituent of biomass of an organism

A. Nitrogen

B. Carbon

C. Phospnorus

D. Oxygen

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In grassland ecosystem the pyramid of energy is

A. upright

B. inverted

C. upright or inverted

D. none of these