Question

Question 12 Fill in the gaps:

(a) Ascending limb of Henle’s loop is ____________to water whereas the descending limb is___________to it.

(b) Reabsorption of water from distal parts of the tubules is facilitated by hormone____________.

(c) Dialysis fluid contains all the constituents as in plasma except ________.

(d) A healthy adult human excretes (on an average) _______ gm of urea/day.

Class - XI - Biology Chapter Excretory Products and their Elimination Page No. 301

Answer 1

Heya..

Here u go..

1.1 = impermeable and 1.2 is permeable

2 is vasopressin

3 is nitrogenous waste

4 is 25 to 30

Hope it helps ya :)

Answer 2

(a) Ascending limb of Henle’s loop is impermeable to water whereas the descending limb is permeable to it

→ That's because the loop has a sharp bend in the renal medulla going from descending to ascending thin limb.

(b) Reabsorption of water from distal parts of the tubules is facilitated by hormone vasopressin.

→ Vasopressin allows more water reabsorption and excretion of more concentrated urine.

(c) Dialysis fluid contains all the constituents as in plasma except nitrogenous wastes.

(e) A healthy adult human excretes (on an average) 25-30 gm of urea per day.