Human Excretory System
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NCERT Class 11 Biology Chapter wise Solutions
UNIT I: DIVERSITY IN THE LIVING WORLD
- 1 : The Living World
- 2 : Biological Classification
- 3 : Plant Kingdom
- 4 : Animal Kingdom
UNIT II: STRUCTURAL ORGANISATION IN PLANTS AND ANIMALS
- 5 : Morphology of Flowering Plants
- 6 : Anatomy of Flowering Plants
- 7 : Structural Organisation in Animals
UNIT III: CELL: STRUCTURE AND FUNCTIONS
- 8 : Cell : The Unit of Life
- 9 : Biomolecules
- 10 : Cell Cycle and Cell Division
UNIT IV: PLANT PHYSIOLOGY
- 11 : Transport in Plants
- 12 : Mineral Nutrition
- 13 : Photosynthesis in Higher Plants
- 14 : Respiration in Plants
- 15 : Plant Growth and Development
UNIT V: HUMAN PHYSIOLOGY
- 16 : Digestion and Absorption
- 17 : Breathing and Exchange of Gases
- 18 : Body Fluids and Circulation
- 19 : Excretory Products and their Elimination
- 20 : Locomotion and Movement
- 21 : Neural Control and Coordination
- 22 : Chemical Coordination and Integration
NCERT Solutions For Class 11 Biology Chapter 19 Human Excretory System
- 19.1 Human Excretory System
- 19.2 Urine Formation
- 19.3 Function of the Tubules
- 19.4 Mechanism of Concentration of the Filtrate
- 19.5 Regulation of Kidney Function
- 19.6 Micturition
- 19.7 Role of other Organs in Excretion
- 19.8 Disorders of the Excretory System
NCERT Solutions For Class 11 Biology Human Excretory System
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.
(b) ADH helps in water elimination, making the urine hypotonic.
(c) Protein-free fluid is filtered from blood plasma into the Bowman’s capsule.
(d) Henle’s loop plays an important role in concentrating the urine.
(e) Glucose is actively reabsorbed in the proximal convoluted tubule.
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 :
| Column I | Column II |
| (a) Ammonotelism | (i) Birds |
| (b) Bowman’s capsule | (ii) Water reabsorption |
| (c) Micturition | (iii) Bony fish |
| (d) Uricotelism | (iv) Urinary bladder |
| (d) ADH | (v) Renal tubule |
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
(b) Cortical portions projecting between the medullary pyramids in the human kidney
(c) A loop of capillary running parallel to the Henle’s loop.
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 contain all the constituents as in plasma except _______.
(d) A healthy adult human excretes (on an average) _______ gm of urea/day.