Biology - Questions and Answers, General Study (GK)

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661.

Once blood clots at a wound, harmful bacteria are prevented from entering by

(a)Exudation of serum

(b)Antibodies

(c)Antitoxins released by the blood clot

(d)Scab formation

Comment

Answer is: D

662.

People who live at high altitudes have rosy cheeks because

(a)Fed cell concentration becomes considerably above the average in response to lowered oxygen pressure

(b)The rate of capillary circulation increases in the skin to make it look pinkish

(c)Haemoglobin has an increased binding affinity for Oxygen to become deep red in colour

(d)All of these

Comment

Answer is: A

663.

The route of circulation in the human heart is ?

(a)Left auricle--right auricle-right ventricle-Pulmonary artery-lungs-pulmonary veins-left ventricle-aorta

(b)Right auricle-right ventricle--pulmonary artery-lungs-pulmonary veins --left auricle--lett ventricle---aorta

(c)Right auriclc-left auricle-right ventricle--pulmonary artery--lungs-Pulmonary veins--left ventricle-aorta

(d)Right auricle--right ventricle-pulmonary veins-lungs-pulmonary artery -left auricle-left ventricle-aorta

Comment

Answer is: D

664.

The fundamental role of root hairs in plants is ?

(a)To absorb water and mineral salts from the soil

(b)To bind soil particles to the root for firm fixation of the plant

(c)To protect the young root from damage by coarse soil particles

(d)To protect the root from soil microbes

Comment

Answer is: A

665.

Water and mineral salts are translocated in plants in the ?

(a)Parenchyma

(b)Collenchyma

(c)Xylem

(d)Phloem

Comment

Answer is: C

666.

The transport of organic substances in plants. is through

(a)Wood

(b)Xylem

(c)Phloem

(d)Fibres

Comment

Answer is: C

667.

Water and mineral salts are translocated through vessels in angiosperms. The maximum length of such a vessel is

(a)100 km

(b)More than 100 cm

(d)100 mm

Comment

Answer is: B

668.

The volume of urine produced in an adult human every 24 hours is

(a)1.5 litres

(b)2.0 litre

(d)4.0 litres

Comment

Answer is: A

669.

The artificial kidney operates on the principle of

(a)Dialysis

(b)Active transport

(c)Osmosis

(d)Diffusion

Comment

Answer is: A

670.

The least toxic of nitrogenous wastes is

(a)Creatinine

(b)Creatine

(c)Urea

(d)Uric acid

Comment

Answer is: C

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Biology - Questions and AnswersPage 67

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