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Current Affairs January 2024

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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

Correct Answer :

B. Forests act as water sheds


Related Questions

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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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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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What is the major constituent of biomass of an organism

A. Nitrogen

B. Carbon

C. Phospnorus

D. Oxygen

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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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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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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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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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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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Desert plants are generally

A. Succulents

B. Heterophyllous

C. Herbaceous

D. Viviparous

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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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The least porous soil among the following is

A. loam soil

B. clay soil

C. sandy soil

D. poeaty soil

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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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The nitrifying bacteria which oxidise nitrite to nitrates include

A. Nitrosomonas

B. Azotobacter

C. Nitrobacter

D. Closteridium

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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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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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4

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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4

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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Hydrilla is a

A. suspended hydrophyte

B. submerged hydrophyte

C. floating and anchored plant

D. a free floating hydrophyte

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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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Humus is an example of

A. soil structure

B. organic colloids

C. crystalloids

D. none of 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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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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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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Carbon cycle includes

A. producer - consumer - decomposer

B. decomposer - consumer - producer

C. producer - decomposer - consumer

D. consumer - producer - decomposer

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Silent valley is situated in

A. Kashmir

B. Kerala

C. Africa

D. America

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Radiation is a health hazard as it causes

A. leukaemia

B. polio

C. pneumonia

D. haemophilia

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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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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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In grassland ecosystem the pyramid of energy is

A. upright

B. inverted

C. upright or inverted

D. none of these