Excretory Products and their Elimination

The ornithine cycle removes two waste products from the blood in the liver. These products are

• CO₂ and urea

• ammonia and urea

• CO₂ and ammonia

• ammonia and uric acid

Match the items given in Column I with those in Column II and select the correct option given below:

• a	b	c	d
  iv	v	ii	iii

• a	b	c	d
  iv	i	ii	iii

• a	b	c	d
  v	iv	i	iii

• a	b	c	d
  v	iv	i	ii

Which of the following statements is correct?

• The ascending limb of loop of Henle is impermeable to water

• The descending limb of loop of Henle is impermeable to water

• The ascending limb of loop of Henle is permeable to water

Statement I. The renal fluid becomes increasingly concentrated, when it flows down in the descending limb of loop of Henle towards inner medulla, but its concentration decreases in the ascending limb, when it flows towards the cortex.

Statement II. The descending limb of the loop of Henle water is reabsorbed; the ascending limb is impermeable to water, but salts are absorbed.

• Statement I is correct, but Statement II is incorrect

• Statement II is correct, but Statement I is incorrect

• Both statements are correct

• Both statements are incorrect

Which part of the nephron is impermeable to water

• Proximal convoluted tubule

• Distal convoluted tubule

• Ascending limb of loop of Henle

• Descending limb of loop of Henle

Excretory structures in Rotifers are

• Green glands

• Malpighian tubules

• Flame cells

• Gills

• Gills

A hormone, secreted by the endocrinal cells of duodenal mucosa which influences the releases of pancreatic juice is

• relaxin

• cholecystokinin

• Secretin

• Progesterone