Class 11 Biology - Chapter Excretory products and their Elimination NCERT Solutions | Terrestrial animals are generally either
Terrestrial animals are generally either ureotelic or uricotelic, not ammonotelic, why?
Terrestrial animals are either ureotelic or uricotelic, and not ammonotelic. This is because of the following two main reasons:
(a) Ammonia is highly toxic in nature. Therefore, it needs to be converted into a less toxic form such as urea or uric acid.
(b) Terrestrial animals need to conserve water. Since ammonia is soluble in water, it cannot be eliminated continuously. Hence, it is converted into urea or uric acid. These forms are less toxic and also insoluble in water. This helps terrestrial animals conserve water.
More Questions From Class 11 Biology - Chapter Excretory products and their Elimination
- Q:-
Describe the role of liver, lungs and skin in excretion.
- Q:- Explain the autoregulatory mechanism of GFR.
- Q:- Give a brief account of the counter current mechanism.
- Q:- 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 Henles loop. - Q:- What is the significance of juxtaglomerular apparatus (JGA) in kidney function?
- Q:- Fill in the gaps:
(a) Ascending limb of Henles 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. - Q:-
What is meant by the term osmoregulation?
- Q:- Match the items of column I with those of column II:
Column I Column II
(a) Ammonotelism (i) Birds
(b) Bowmans capsule (ii) Water reabsorption
(c) Micturition (iii) Bony fish
(d) Uricotelism (iv) Urinary bladder
(e) ADH (v) Renal tubule - Q:- Explain micturition.
- Q:- Define Glomerular Filtration Rate (GFR)
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Which of the following is not correct?
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(b) Schleiden and Schwann formulated the cell theory.
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- Q:-
Both lysosomes and vacuoles are endomembrane structures, yet they differ in terms of their functions. Comment.
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Column I Column II
(a) Chlamydomonas (i) Moss
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(a) Cells of all living organisms have a nucleus.
(b) Both animal and plant cells have a well defined cell wall.
(c) In prokaryotes, there are no membrane bound organelles.
(d) Cells are formed de novo from abiotic materials. - Q:-
Which of the following is not correct?
(a) Robert Brown discovered the cell.
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(c) Virchow explained that cells are formed from pre-existing cells.
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