CBSE/NCERT/Exercises/Class_11_Biology
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
BioNotesBioNotesCreated by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
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NCERT Biology Exercises for Class 11 Biology - Chapter 16 Excretory Products and their Elimination - Class_11_Biology
1. Define Glomerular Filtration Rate (GFR)
2. Explain the autoregulatory mechanism of GFR.
3. Indicate whether the following statements are true or false: (a) Micturition is carried out by a reflex. (True) (b) ADH helps in water elimination, making the urine hypotonic. (False - ADH facilitates water reabsorption, making urine hypertonic) (c) Protein-free fluid is filtered from blood plasma into the Bowman’s capsule. (True) (d) Henle’s loop plays an important role in concentrating the urine. (True) (e) Glucose is actively reabsorbed in the proximal convoluted tubule. (True)
4. Give a brief account of the counter current mechanism.
5. Describe the role of liver, lungs and skin in excretion.
6. Explain micturition.
7. Match the items of column I with those of column II:
8. What is meant by the term osmoregulation?
9. Terrestrial animals are generally either ureotelic or uricotelic, not ammonotelic, why?
10. What is the significance of juxta glomerular apparatus (JGA) in kidney function?
11. Name the following: (a) A chordate animal having flame cells as excretory structures: Amphioxus (b) Cortical portions projecting between the medullary pyramids in the human kidney: Columns of Bertini (c) A loop of capillary running parallel to the Henle’s loop: Vasa recta
12. Fill in the gaps: (a) Ascending limb of Henle’s loop is impermeable to water whereas the descending limb is permeable to it. (b) Reabsorption of water from distal parts of the tubules is facilitated by hormone ADH. (c) Dialysis fluid contain all the constituents as in plasma except nitrogenous wastes. (d) A healthy adult human excretes (on an average) 25-30 gm of urea/day.