IGCSE Biology Paper-2: Specimen Questions with Answers 159 - 160 of 203

Question 159

Question

MCQ▾

What is the function of the anus?

Choices

Choice (4)

a.

Egestion

b.

Digestion

c.

Excretion

d.

Respiration

Answer

a.

Explanation

  • The anus is the last part of the digestive tract. It is a 2-inch long canal consisting of the pelvic floor muscles and the two anal sphincters (internal and external) .
  • The lining of the upper anus is able to detect rectal contents. It lets you know whether the contents are liquid, gas, or solid.
The Anus is the Last Part

Question 160

Question

MCQ▾

Which identifies the chemical elements found in proteins?

Key

√ Present

× Absent

Choices

Choice (4)

a.

Carbon- √ , Hydrogen- × , Oxygen- × , Nitrogen- √

b.

Carbon- √ , Hydrogen- √ , Oxygen- × , Nitrogen- √

c.

Carbon- √ , Hydrogen- √ , Oxygen- √ , Nitrogen- √

d.

Carbon- √ , Hydrogen- × , Oxygen- × , Nitrogen- ×

Answer

c.

Explanation

Solution

  • Protein name is derived from a Greek word proteioses, which means, “holding first place.”
  • Essential elements in protein are C, H, O, N, (sulphur is also present in less amount)
  • After water, proteins are most abundant compounds in protoplasm. Amount of proteins is different in different sources - in muscle, in blood plasma, in cow milk, in cereal grain, in nuts and pulses, in white part of egg. in yellow part of egg.
  • Different elements in simple proteins have following proportion-
  • Carbon- Hydrogen- Oxygen- Nitrogen- Sulphur-
  • Caloric value - 5.6 kcal/gm
  • Daily requirement - 70 - 100 gm
  • Proteins are polymer of amino acid.

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