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Current Affairs January 2024

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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

Correct Answer :

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


Related Questions

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The least porous soil among the following is

A. loam soil

B. clay soil

C. sandy soil

D. poeaty soil

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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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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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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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What is the major constituent of biomass of an organism

A. Nitrogen

B. Carbon

C. Phospnorus

D. Oxygen

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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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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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Vegetation in Delhi is predominantly

A. halophytic

B. mesophytic

C. xerophytic

D. hydrophytic

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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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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 area of soil is thoroughly wetted and allowed to drain until capillary movement of water is stopped. The water content of the soil now gives

A. storage water

B. capillary water

C. field capacity

D. gravitational water

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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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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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Carbon cycle includes

A. producer - consumer - decomposer

B. decomposer - consumer - producer

C. producer - decomposer - consumer

D. consumer - producer - decomposer

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Hie earliest settlers on barren lands are generally

A. Diatoms

B. Lichens

C. Mosses

D. Ferns

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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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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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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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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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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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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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Deforestation may reduce the chances of

A. frequent cyclones

B. rainfall

C. frequent landslides

D. erosion of soil surface

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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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Pedology is the study of

A. soil

B. locomotion of animals

C. rocks

D. crop diseases

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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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Desert plants are generally

A. Succulents

B. Heterophyllous

C. Herbaceous

D. Viviparous

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Tropical evergreen forests are seen in

A. Himachal Pradesh

B. Haryana

C. Tamil Nadu

D. Assam

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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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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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In grassland ecosystem the pyramid of energy is

A. upright

B. inverted

C. upright or inverted

D. none of these