Biology - Questions and Answers, General Study (GK)

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381.

Greenhouse effect is

(a)Collection of greenhouse gases which rise the temperature of atmosphere

(b)Production of flowers and vegetables in increased temperature

(c)Production of crops in glass house

(d)None of the above

Comment

Answer is: ANA

382.

Which one of the following is the main cause of the ecological imbalance in India?

(a)Deforestation

(b)Desertification

(c)Floods and famines

(d)Rainfall variations

Comment

Answer is: ANA

383.

Carbon dioxide is called a greenhouse gas because

(a)Its concentration remains always higher than other gases

(b)It is used in photosynthesis

(c)It absorbs infrared radiation

(d)It emits visible radiation

Comment

Answer is: CNA

384.

The minimum area of the land required to completely sustain the life of one person is called his

(a)Biota

(b)Ecological footprint

(c)Biome

(d)Niche

Comment

Answer is: BNA

385.

The non-biotic pollutant of underground water is

(a)Bacteria

(b)Algae

(c)Arsenic

(d)Viruses

Comment

Answer is: CNA

386.

Lichens are the best indicator of

(a)Air pollution

(b)Water pollution

(c)Soil pollution

(d)Noise pollution

Comment

Answer is: CNA

387.

The cycling of element in an ecosystem is called

(a)Chemical cycle

(b)Biogeochemical cycle

(c)Geological cycle

(d)Geochemical cycle

Comment

Answer is: BNA

388.

As an ecosystem, wetlands are useful foe which of the following

(a)For nutrient recovery and cycling

(b)For releasing heavy metals through absorption by plants

(c)In reducing saltation of rivers by retaining sediments

(d)All of the above

Comment

Answer is: DNA

389.

Which of the following is not a greenhouse gas?

(a)Carbon dioxide

(b)Methane

(c)Nitrous oxide

(d)Nitrogen

Comment

Answer is: DNA

390.

Vermicompost is a/an

(a)Inorganic fertilizer

(b)Toxic substance

(c)Organic bio fertilizer

(d)Synthesis fertilizer

Comment

Answer is: CNA

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Biology - Questions and AnswersPage 39

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