IGCSE Biology Paper-1: Specimen Questions with Answers 41 - 44 of 208

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Question 41

Question

MCQ▾

The populations of three organisms in a lake were measured between 1970 to 1980. Which organism was affected by an outbreak of disease in 1974?

Graph of Populations of Three Organisms vs. Years

Choices

Choice (4)

a.

b

b.

c

c.

a

d.

All of the above

Answer

a.

Explanation

As shown in the graph, the number of organisms decrease in ‘b’ due to disease in 1974.

Question 42

Question

MCQ▾

How many chromosomes are there in cucumber?

Choices

Choice (4)

a.

13

b.

14

c.

12

d.

15

Answer

b.

Explanation

The botanical family of cucumber is Cucurbitaceous which has seven pairs of chromosomes.

Question 43

Question

MCQ▾

What is essential for germination in plants?

Choices

Choice (4)

a.

Carbon monoxide

b.

Nitrogen

c.

Hydrogen

d.

Oxygen

Answer

d.

Explanation

Aeration of the soil is required for the germination of the seed because oxygen is essential for the aerobic respiration by which the seeds get the required energy for the development.

Question 44

Question

MCQ▾

Muscle fiber group is known as?

Choices

Choice (4)

a.

Perimysium

b.

Endomysium

c.

Fascicles

d.

Myosin

Answer

c.

Explanation

Muscle fibers are Cylinder-shaped cells that make up skeletal muscle, each fibre is made up of a number of myofilaments. Diameter of fibre is 0.05 - 0.10 mm.

Muscle Fibers Are Cylinder-Shaped

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