IGCSE Biology Paper-2: Specimen Questions with Answers 46 - 48 of 203

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Question 46

Question

MCQ▾

What is the main function of multipolar neurons-?

Choices

Choice (4)

a.

Carry messages from the body՚s sense receptors to the CNS

b.

Form all the neural wiring within the CNS

c.

Carry signals from the CNS to the muscles and glands

d.

All of the above

Answer

c.

Explanation

Carry messages from the body՚s sense receptors to the CNS is the function of sensory neurons and making neural wiring within the CNS is the function of pseudo polar cells. Multipolar neurons carry signals from the CNS to the muscles and glands. These neurons have many processes originating from the cell body.

Question 47

Question

MCQ▾

Picture shows a food web

Picture Shows a Food Web with Crab

What are the autotrophs in given food web-?

Choices

Choice (4)

a.

Plant plankton and algae

b.

Seaweed and plant plankton

c.

Sea Anemone and Seaweed

d.

Seaweed and shrimp

Answer

b.

Explanation

Autotrophs comes under first trophic level of food web and they get energy by the process of photosynthesis. In given figure seaweed and plant planktons are the autotrophs.

Question 48

Question

MCQ▾

Respiration is the process by which animals exchange some gases with their environment. Complete the process of respiration.

+ ⇾ ?

Choices

Choice (4)

a.

+ + Energy

b.

+ + Energy

c.

+ + Energy

d.

Question does not provide sufficient data or is vague

Answer

b.

Explanation

Respiration is the movement of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction.

+ ⇾ 6C + + Energy

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