IGCSE Biology Paper-2: Specimen Questions with Answers 56 - 58 of 103

Question number: 56

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Question

The circulation of some gases and elements is known as

Choices

Choice (4) Response

a.

Geothermal cycle

b.

Biological cycle

c.

Biogeochemical cycle

d.

Chemical cycle

Answer

c.

Explanation

Biogeochemical cycling of compounds is a pathway by which a chemical substance moves in both biotic and abiotic compartments of Earth.

Question number: 57

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Question

Which is not the part of digestive system?

Choices

Choice (4) Response

a.

Stomach

b.

Mouth

c.

Heart

d.

Esophagus

Answer

c.

Explanation

Digestive system is a process in which breakdown of food into smaller and smaller components occur, which can be absorbed and assimilated into the body. Main parts of digestive system are mouth, throat, esophagus, Stomach, small intestine, colon, rectum and anus. Heart is not the part of digestive system.

Question number: 58

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Question

Which acids are mainly responsible for acid rain-?

Choices

Choice (4) Response

a.

Phosphoric acid and carbonic acid

b.

Nitric acid and sulphuric acid

c.

Chloric acid and hypochlorous acid

d.

Hydrochloric acid and chloroform

Answer

b.

Explanation

Acid rain is a global problem, which is a mixture of wet and dry deposition from the atmosphere containing higher amounts of nitric and sulfuric acids. The precursors, of acid rain formation result from both natural sources, such as volcanoes and decaying vegetation, and synthetic sources, primarily emission of sulfur dioxide and nitrogen oxides resulting from fossil fuel combustion.