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NCERT · Class 11 · Biology

Chapter 16: Excretory Products and their Elimination

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Textbook exercises

12 questions
Q11Written answer

Name the following:

  1. A chordate animal having flame cells as excretory structures.

  2. Cortical portions projecting between the medullary pyramids in the human kidney.

  3. A loop of capillary running parallel to Henle’s loop.

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Ans:

  1. The flame cell is a specialized cell that helps in osmoregulation and excretion and it is present in the amphioxus which is an example of Cephalochordata.

  2. The columns of Bertini are the cortical portion that projects between the medullary 

  3. Vasa recta is the loop of capillaries that runs parallel to the loop of Henle's.


Q12Written answer

Fill in the gaps

(1) Ascending limb of  Henle's loop is ________________ to water whereas the descending limb is _____________ to it.

(2) Reabsorption of water from the distal part of the tubules is facilitated by hormone_______________.

(3) Dialysis fluid contains all the constituents as in plasma except ______________.

(4) A healthy adult human excretes an average ___________ gm of urea per day.

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Worked solution

Ans: (1) Impermeable, Permeable

(2) Vasopressin

(3) The nitrogenous waste

(4) 25-30