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Q. No.Subtopic: Nitrogenous Excretory Products |
80%
From NCERT
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The most toxic nitrogenous metabolic waste product is:
| 1. ammonia | 2. urea |
| 3. uric acid | 4. methane |
Subtopic: Nitrogenous Excretory Products |
92%
From NCERT
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Uricotelic mode of passing out nitrogenous wastes is found in
| 1. reptiles and bird | 2. birds and annelids |
| 3. amphibians and reptiles | 4. insects and amphibians |
Subtopic: Nitrogenous Excretory Products |
80%
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Subtopic: Nitrogenous Excretory Products |
75%
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Urea is:
1. more toxic than ammonia
2. produced in kidneys
3. energetically more expensive to produce than ammonia
4. never present in human blood
1. more toxic than ammonia
2. produced in kidneys
3. energetically more expensive to produce than ammonia
4. never present in human blood
Subtopic: Nitrogenous Excretory Products |
71%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Excreting uric acid in birds and reptiles with shelled eggs conveys a selective advantage. |
| Reason (R): | Uric acid is more energetically expensive than urea. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Nitrogenous Excretory Products |
56%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Many amphibians excrete mainly ammonia when they are aquatic tadpoles and switch largely to urea excretion when they become land dwelling adults. |
| Reason (R): | The main disadvantage of urea is its energy cost and the main advantage is its low toxicity. |
In the light of the above statements choose the correct answer from the options given below
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Nitrogenous Excretory Products |
52%
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All the following animals are uricotelic except:
| 1. Reptiles | 2. Land snails |
| 3. Birds | 4. Marine fishes |
Subtopic: Osmoregulation |
89%
From NCERT
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Protonephridia are the excretory structures in all the following except:
| 1. Planaria | 2. Rotifers |
| 3. Amphioxus | 4. Prawns |
Subtopic: Osmoregulation |
78%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | The filtration step common to other excretory systems in Malpighian tubules is absent. |
| Reason (R): | Malpighian tubules in insects serve in excretion and osmoregulation. |
In the light of the above statements choose the correct answer from the options given below
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Nitrogenous Excretory Products |
62%
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