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Current Affairs January 2024

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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

Correct Answer :

A. In which individuals interact with each other


Related Questions

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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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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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The nitrifying bacteria which oxidise nitrite to nitrates include

A. Nitrosomonas

B. Azotobacter

C. Nitrobacter

D. Closteridium

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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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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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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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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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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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Hie earliest settlers on barren lands are generally

A. Diatoms

B. Lichens

C. Mosses

D. Ferns

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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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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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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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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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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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Tropical evergreen forests are seen in

A. Himachal Pradesh

B. Haryana

C. Tamil Nadu

D. Assam

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Desert plants are generally

A. Succulents

B. Heterophyllous

C. Herbaceous

D. Viviparous

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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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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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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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. 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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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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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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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

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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Deforestation may reduce the chances of

A. frequent cyclones

B. rainfall

C. frequent landslides

D. erosion of soil surface

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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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Silent valley is situated in

A. Kashmir

B. Kerala

C. Africa

D. America

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Correct definition of ecosystem is :

A. A community of organisms interacting with one another

B. The abiotic component of a habitat

C. The part of the earth and its atmosphere which inhabits living organisms

D. The community of organisms together with environment in which they live

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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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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