2017 - WAEC Biology Past Questions and Answers - page 2

11

Which of the following actions does not occur during exhalation in man?

A

Thoracic cavity decreases in volume

B

Diaphragm flattens

C

Ribs move down and in

D

Air pressure increases in the thoracic cavity

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12

The diagram above is an illustration of the urinary tubule in a mammal. Which of the following substances is found in the part labelled II only?

A

Lipid

B

Glucose

C

Urea

D

Uric acid

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13

The diagram above is an illustration of the urinary tubule in a mammal. The part which contains lowest concentration of urea is labelled

A

I

B

II

C

III

D

IV

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14

The diagram above is an illustration of the urinary tubule in a mammal. Which of the following substances is greater in concentration in the part labelled IV when compared to that part labelled I?

A

Lipid

B

Glucose

C

Urea

D

Uric acid

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15

Deamination of amino acids in the liver produces

A

blood sugar

B

glycogen

C

bile

D

urea

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16

Which of the following glands also serves as an exocrine gland?

A

Ovary

B

Pancreas

C

Adrenal

D

Thyroid

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17

Which of the following sequences is the correct route of the transmission of impulses along a reflex arc?

A

\(Receptor\to sensory neuron \to synapse \to intermediate neuron \to synapse \to motor neuron \to effector\)

B

\(Receptor \to motor neuron \to synapse \to intermediate neuron \to synapse \to sensory neuron \to effector\)

C

\(Effector \to intermediate neuron \to synapse \to motor neuron \to synapse \to sensory neuron \to receptor\)

D

\(Effector \to motor neuron \to synapse \to sensory neuron \to synapse \to intermediate neuron \to receptor\)

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18

When viewing an object that is close to the human eye, the

A

eye lens becomes thin

B

ciliary muscles relax

C

suspensory lens become taut

D

eye lens becomes fat

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19

The diagram above is an illustration of the human sperm. The part labelled I is the

A

acrosome

B

nucleus

C

mitochondrion

D

tail

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20

In the diagram of the human sperm above, the function of the part labelled II is to

A

fuse the ovum during fertilization

B

generate the energy for the sperm to swim to the fallopian tube

C

help the sperm to swim forward

D

dissolve the membrane of the egg during fertilization

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2017 - WAEC Biology Past Questions and Answers - page 2

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