Assertion (A): Circulatory system of arthropods and molluscs is mainly open type.
Reason (R): Blood pumped out by the heart is circulated through a series of blood vessels in them.
Assertion (A): Circulatory system of arthropods and molluscs is mainly open type.
Reason (R): Blood pumped out by the heart is circulated through a series of blood vessels in them.
Show Hint
- Both A and R are true. R is the correct explanation for A
- Both A and R are true. But R is not the correct explanation for A
- A is true. But R is false
- A is incorrect but R is true
The Correct Option is C
Solution and Explanation
To solve this problem, we need to evaluate the assertion and reason provided and determine whether they are correct and if the reason correctly explains the assertion.
1. Understanding the Assertion [A]:
The assertion states that the circulatory system of arthropods and mollusks is mainly of the open type. This is correct. Arthropods and mollusks have an open circulatory system where the blood is not confined to blood vessels but instead flows freely in the body cavity.
2. Understanding the Reason [R]:
The reason states that blood pumped out by the heart is circulated through a series of blood vessels. This is not accurate for arthropods and mollusks, as their blood is not fully confined to vessels and circulates in a body cavity. In an open circulatory system, blood is pumped into the body cavity (hemocoel) and does not circulate strictly through vessels like in closed circulatory systems.
3. Conclusion:
While the assertion is correct, the reason is not a valid explanation of the assertion. The reason describes characteristics of a closed circulatory system, which is not applicable to arthropods and mollusks.
Final Answer:
The correct answer is Option C: A is true. But R is false.
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