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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

Correct Answer :

C. ecological succession trend


Related Questions

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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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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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What is the major constituent of biomass of an organism

A. Nitrogen

B. Carbon

C. Phospnorus

D. Oxygen

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Which is the correct food chain

A. grass � wolf > deer > buffalo

B. bacteria � grass � rabbit > wolf

C. grass � insect � bird � snake

D. grass > snake �insect � deer

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The nitrifying bacteria which oxidise nitrite to nitrates include

A. Nitrosomonas

B. Azotobacter

C. Nitrobacter

D. Closteridium

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4

The source of energy in the ecosystem is:

A. decomposition of animals and plants by bacteria

B. photosynthesis by green plants

C. fermentation of sugars

D. sun-light

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What will happen if our water resources are continued to be polluted by industrial wastes

A. Sufficient food will not be available to water organisms

B. Sufficient oxygen will not be available to water organisms

C. Drinking water will not be available

D. B.O.D value of water will decrease

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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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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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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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Vegetation in Delhi is predominantly

A. halophytic

B. mesophytic

C. xerophytic

D. hydrophytic

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Pedology is the study of

A. soil

B. locomotion of animals

C. rocks

D. crop diseases

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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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4

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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Hie earliest settlers on barren lands are generally

A. Diatoms

B. Lichens

C. Mosses

D. Ferns

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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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Deforestation may reduce the chances of

A. frequent cyclones

B. rainfall

C. frequent landslides

D. erosion of soil surface

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Which of the following functions performed by forests help most in controlling drought

A. Forest prevent soil erosion

B. Forests act as water sheds

C. Forests have lots of water plants

D. Forests bring rainfall, in monsoon

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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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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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Carbon cycle includes

A. producer - consumer - decomposer

B. decomposer - consumer - producer

C. producer - decomposer - consumer

D. consumer - producer - decomposer

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Primary treatment of sewage means

A. encouragement of growth of microbes to decompose sewage

B. disinfection of sewage

C. removal of heavy grit from sewage in the settling chambers

D. pumping of sewage into aeration tanks for increased microbial activity

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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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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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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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Desert plants are generally

A. Succulents

B. Heterophyllous

C. Herbaceous

D. Viviparous

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The food chain in which microorganisms break down the energy-rich compounds synthesized by producers is

A. parasitic food chain

B. consumer food chain

C. detritus food chain

D. predator food chain

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The first stage of plant succession on earth is called

A. Adaptation

B. Acclimatisation

C. Colonisation

D. All the above

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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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Tropical evergreen forests are seen in

A. Himachal Pradesh

B. Haryana

C. Tamil Nadu

D. Assam