Assertion :
Gill-lamellae in aquatic animals help in exchange of gases.
Reason:
Each gill lamella carries many blood capillaries.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Gills are the main respiratory organs of aquatic animals. Each gill bears rows of comb-like, soft, thin gill-filament, each gill-filament bears many flat, parallel membrane-like gill-lamellae. Each gill lamella carries many blood capillaries. Water taken through the mouth, is made to flow from the pharynx in a single direction between the gill lamella. Blood flows in the capillaries of gill-lamella in a direction opposite to the flow of water over the lamellar surfaces. This greatly helps in the gaseous exchange across the lamellar membrane between the capillary blood and the flowing water.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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Assertion :Gill-lamellae in aquatic animals help in exchange of gases. Reason: Each gill lamella carries many blood capillaries.

Assertion :
Gill-lamellae in aquatic animals help in exchange of gases.
Reason:
Each gill lamella carries many blood capillaries.