Q. No.
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The most toxic nitrogenous metabolic waste product is:
| 1. ammonia | 2. urea |
| 3. uric acid | 4. methane |
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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 |
1. more toxic than ammonia
2. produced in kidneys
3. energetically more expensive to produce than ammonia
4. never present in human blood
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. |
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. |
All the following animals are uricotelic except:
| 1. Reptiles | 2. Land snails |
| 3. Birds | 4. Marine fishes |
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Protonephridia are the excretory structures in all the following except:
| 1. Planaria | 2. Rotifers |
| 3. Amphioxus | 4. Prawns |
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| 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. |
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