Biology - Environmental Issues Questions and Answers of Class 12 NCERT

(16) We and our surroundings together are called...

[1] environment

[2] atmosphere

[3] lithosphere

[4] hydrosphere

Answer: environment

(17) Which of the following is not an environmental problem ?

[1] Wastage of water

[2] Conservation of water

[3] Deforestation

[4] Land erosion

Answer: Conservation of water

(18) Volcano is ______ source of pollution.

[1] artificial

[2] natural

[3] both

[4] man-made

Answer: natural

(19) A disease affecting industrial workers is

[1] Silicosis

[2] Fluorosis

[3] Asthma

[4] None of these

Answer: Silicosis

(20) The slow rate of decomposition of fallen logs in nature is due to their:

[1] Poor nitrogen content

[2] Low moisture content

[3] Low cellulose content

[4] Anaerobic environment around them

Answer: Poor nitrogen content

21 BOD is connected with

[1] Microbes

[2] Organic matter

[3] Microbes and organic matter

[4] None of these

Answer: Microbes and organic matter

22 Sulphur dioxide affects

[1] All membrane systems

[2] Plasmodesmata

[3] Cell wall

[4] Nucleus

Answer: All membrane systems

23 Decomposition of domestic wastes under natural processes is called

[1] Industrial pollution

[2] Thermal pollution

[3] Biodegradable pollution

[4] Nonbiodegradable pollution

Answer: Biodegradable pollution

24 Ozone hole is largest over

[1] Antarctica

[2] Europe

[3] Africa

[4] China

Answer: Antarctica

24 The major pollutant from automoblie exhaust is

[1] NO

[2] CO

[3] SO₂

[4] Soot

Answer: CO

26 Which one of the following is not a bioindicator of water pollution?

[1] Blood-worms

[2] Sludge-worms

[3] Sewage fungus

[4] Stone flies

Answer: Stone flies

27 Which of the following pollutants is discharged by jet planes?

[1] Photo-chemical oxidants

[2] Fog

[3] Smog

[4] Aerosols

Answer: Aerosols

28 Lichens indicate pollution by

[1] Ozone

[2] SO₂

[3] NO₃

[4] CO

Answer: SO₂

29 Photochemical smog results problems in

[1] vegetation

[2] animals

[3] building materials

[4] all of these

Answer: all of these

30 Chronic exposure to arsenic causes

[1] skeletal flororosis

[2] black foot disease

[3] itai itai disease

[4] blue baby syndrome

Answer: black foot disease

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