IGCSE Biology Paper-2: Specimen Questions with Answers 85 - 87 of 203

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Question 85

Question

MCQ▾

In digestive system of human beings digestion start in … and digestion is completed in … ?

Choices

Choice (4)

a.

Gullet and large intestine

b.

Gullet and small intestine

c.

Mouth and stomach

d.

Mouth and small intestine

Answer

d.

Explanation

Digestion is a process of breakdown of food materials into simpler compounds. In digestive system of human beings, digestion start in mouth and digestion is completed in small intestine.

Question 86

Question

MCQ▾

Which statement is right?

Choices

Choice (4)

a.

In lipids fatty acids are usually in the form of Easter

b.

Oleic, Linoleic and linolenic acids are unsaturated fatty acids

c.

Palmitic acid and stearic acid are the example of saturated fatty acids

d.

All a., b. and c. are correct

Answer

d.

Explanation

Fatty acid is a carboxylic acid with a long aliphatic tail chain mainly made up in the form of Easter. These can be of two types either saturated or unsaturated. Palmitic acid and stearic acid are the example of saturated fatty acids And Oleic, Linoleic and linolenic acids are unsaturated fatty acids.

Question 87

Question

MCQ▾

Which is not a feature of enzymes?

Choices

Choice (4)

a.

Used up in reactions

b.

Protein nature

c.

Specific in nature

d.

Speed up the rate of reaction

Answer

a.

Explanation

Enzymes are very important catalysts for biochemical reactions. They speed up reactions by providing an alternative reaction pathway of lower activation energy and never used up in reactions.

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