Assertion :Mass or bulk flow is the movement of substances in bulk from source to sink as a result of pressure differences. Reason: Water, minerals and food are generally moved by mass flow.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Mass or bulk flow is the movement of substances in bulk from source to sink as a result of pressure differences. Fluids (water, minerals, and food) are generally moved by mass flow.
The reason for bulk flow is usually pressure or temperature gradient.
Examples of mass flow include blood circulation and transport of water in vascular plant tissues. Mass flow is not to be confused with diffusion which depends on concentration gradients within a medium rather than pressure gradients of the medium itself.
So the correct option is B.

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