Q. No.The component of blood which prevents its coagulation in the blood vessels is
1. haemoglobin
2. plasma
3. thrombin
4. heparin.
1. haemoglobin
2. plasma
3. thrombin
4. heparin.
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In a glomerulus
1. Afferent arteriole is thicker than efferent arteriole
2. Afferent capillaries are thicker than efferent capillaries
3. Afferent capillaries are thinner than efferent capillaries
4. Afferent arteriole are thinner than efferent arteriole
Assertion: Unlike bony fishes, marine sharks are not hypoosmotic to seawater.
Reason: Like bony fishes, marine sharks have an internal salt concentration much lower than that of seawater.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Assertion: Euryhaline Salmon fish osmoregulate in fresh water like other freshwater fishes.
Reason: In fresh water, salmon increases cortisol secretion which increases the number and size of salt-secreting chloride cells.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Assertion: The kidneys of camel are very efficient at reabsorbing water.
Reason: Camels' kidneys have a 1:4 cortex to medulla ratio.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason 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. |
Assertion: Endotherms produce more nitrogenous wastes than ectotherms.
Reason: All endotherms are predators and derive more energy from protein.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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. |
Assertion: In the freshwater flatworms, protonephridia serve chiefly in osmoregulation rather than in excretion.
Reason: Most metabolic wastes in freshwater flatworms diffuse out of the animal across the body surface or are eliminated into the gastrovascular cavity.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
| 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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