Biology - Questions and Answers, General Study (GK)

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651.

The approximate percent of oxygen content in air is

(a)33

(b)21

(d)5

Comment

Answer is: B

652.

Puncture of the thoracic wall but not of the lung itself will cause ?

(a)Inflation of the lung

(b)A decreased breathing rate

(c)No important interference with breathing

(d)Collapse of the lung

Comment

Answer is: D

653.

On a hot sultry afternoon, a fat person sweats far more profusely than a lean one of the same height. This is due to

(a)Increased rate of fat metabolism

(b)The presence of more sweat pores depending upon greater surface area in a fat person

(c)Greater surface area in a lean person and, therefore increased rate of evaporation of sweat formed

(d)Increase in the size of pores on the skin depending upon greater pressure exerted by swear

Comment

Answer is: C

654.

Muscle fatigue occurs due to the accumulation of

(a)Uric acid

(b)Pyruvic acid

(c)Oxalacetic acid

(d)Lactic acid

Comment

Answer is: D

655.

If a paste of rice or wheat flour is left overnight in the kitchen, its volume increases significantly because Of

(a)Swelling of starch particles in the flour due to absorption of water and air

(b)The release of carbon dioxide due to the activity of yeast

(c)The aromatic air of the kitchen

(d)Bacterial growth

Comment

Answer is: B

656.

It is not advisable to sleep under a tree at night because of the

(a)Release of more oxygen

(b)Release of less oxygen

(c)Release of carbon dioxide

(d)Release of carbon monoxide

Comment

Answer is: D

657.

In case of cardiac arrest, what should be the most primary step ?

(a)Cardiac massage

(b)Mouth-to-mouth respiration

(c)To call a doctor

(d)None of these

Comment

Answer is: A

658.

The blood corpuscles that help to build up resistance against disease are

(a)Monocytes

(b)Lymphocytes

(c)All leucocytes

(d)Neutrophils

Comment

Answer is: B

659.

The life span of human red corpuscles is

(a)120 days

(b)Uncertain

(d)As long as the individual survives

Comment

Answer is: A

660.

The rate at which the heart beats per minute in an adult averages

(a)55

(b)72

(d)92

Comment

Answer is: B

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Biology - Questions and AnswersPage 66

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