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Current Affairs January 2024

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4

The ultimate source of energy for fish is

A. Protozoa

B. Oxygen produced by plants

C. Sunlight

D. Manure in the soil

Correct Answer :

C. Sunlight


Related Questions

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Vegetation in Delhi is predominantly

A. halophytic

B. mesophytic

C. xerophytic

D. hydrophytic

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Silent valley is situated in

A. Kashmir

B. Kerala

C. Africa

D. America

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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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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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In cities like Mumbai and Delhi, the major air pollutants are

A. ozone

B. carbon monoxide and oxides of sulphur

C. hydrocarbons and hot air

D. algae spores and marsh gas

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A pollutant is any substance, chemical or other factor that changes

A. natural geochemical cycles

B. the natural flora of a place

C. the natural wild life of a region

D. the natural balance of our environment

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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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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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4

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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What is the major constituent of biomass of an organism

A. Nitrogen

B. Carbon

C. Phospnorus

D. Oxygen

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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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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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  Which of the following is normally not at atmospheric pollutant

A. CO    

B. so2

C. co2

D.  Hydrocarbons

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Pedology is the study of

A. soil

B. locomotion of animals

C. rocks

D. crop diseases

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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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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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Autumn colouration of leaves appears only in

A. Tropical regions

B. Deserts

C. Temperate deciduous plants

D. Deserts

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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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Competition for food, light and space is most severe in

A. closely related species growing in the same niche

B. closely related species growing in different habitats

C. distantly related species growing in same habitat

D. distantly related species growing in different habitats

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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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4

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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4

The best indicator of SO^2 pollution is

A. Lichens

B. Algae

C. Fungus

D. Fems

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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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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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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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Hydrilla is a

A. suspended hydrophyte

B. submerged hydrophyte

C. floating and anchored plant

D. a free floating hydrophyte

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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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Humus is an example of

A. soil structure

B. organic colloids

C. crystalloids

D. none of the above

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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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4

The ultimate source of energy for fish is

A. Protozoa

B. Oxygen produced by plants

C. Sunlight

D. Manure in the soil