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Biology 2011

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Q. 67.  Which one of the following enzymes carries on the initial step in the digestion of milk in humans?

  1. Trypsin   
  2. Pepsin
  3. Rennin   
  4. Lipase

Sol:

In humans milk protein digesting enzyme in stomach is pepsin. In calves it is rennin. Rennin is also present in small amounts in human infants but not adults. Pepsin acts on water soluble caseinogen (milk protein) to form solubles 'casein'. This combines with calcium salts to form insoluble calcium paracaseinate, which gets readily digested enzymatically.

Answer: (2)

Q. 68.  Which one of the following is not a part of a renal pyramid?

  1. Loops of Henle     
  2. Peritubular capillaries
  3. Convoluted tubules     
  4. Collecting ducts

Sol:

In Bowman's capsule PCT and DCT are in renal cortex, whereas, loops of Henle are in medullary pyramids.

Answer: (3)

Q. 69.  One very special feature in the earthworm pheretima is that

  1. It has a long dorsal tubular heart
  2. Fertilisation of eggs occurs inside the body
  3. The typhlosole greatly increases the effective absorption area of the digested food in the intestine
  4. The S-shaped setae embedded in the integument are the defensive weapons used against the enemies

Sol:

In earthworm, mid dorsal villi typhlosole greatly increases the effective absorption area of the digested food in the intestine

Answer: (3)

Q. 70. Two friends are eating together on a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of

  1. Tongue       
  2. Epiglottis
  3. Diaphragm
  4. Neck

Sol:

If a person suddenly starts coughing while swallowing food, it is due to improper movement of epiglottis. If the glottis is not properly closed some food can enter respiratory tract.

Answer: (2)

Q. 71. Arteries are best defined as the vessels which

  1. Carry blood from one visceral organ to another visceral organ
  2. Supply oxygenated blood to the different organs
  3. Carry blood away from the heart to different organs
  4. Break up into capillaries which reunite to form a vein

Sol:

Arteries are best defined as vessels which carry blood away from the heart to different organs.

Answer: (3)

Q. 72. 'Bundle of His' is a part of which one of the following organs in humans?

  1. Pancreas
  2. Brain
  3. Heart
  4. Kidney

Sol:

'Bundle of His' is a part of conducting system of human heart.

Answer: (3)

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