Question

10. Assertion: Transpiration is a necessary evil. Reason: It causes water loss but helps in absorption and upward movement of water and minerals.

11. Assertion: The connecting wires are made of copper. Reason: The electrical resistivity of copper is high.

12. Assertion: Lungs always contain a residual volume of air. Reason: The presence of residual volume of air provides sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.
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Answer 1

Answer:

9)

Both Assertion and Reason are Correct and Reason is the correct explanation of Assertion

10)

Both Assertion and Reason are Correct and Reason is the correct explanation of Assertion

11)

Assertion is correct but reason is false

12)

Both Assertion and Reason are Correct and Reason is the correct explanation of Assertion

Explanation:

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Answer 2

Assertion: Transpiration is a necessary evil.  

True

 Reason: It causes water loss but helps in absorption and upward movement of water and minerals.

correct.

Assertion: The connecting wires are made of copper.

True

Reason: The electrical resistivity of copper is high.

correct.

Due to high electrical conductivity of copper, it conducts the current without offering much resistance. The copper being diamagnetic material does not get magnetised due to current through it and hence does not disturb the current in the circuit.

Copper is an excellent conductor of electricity, allowing electricity to flow freely through it. As a result, it's employed to form wire connections. Copper has an extremely low electrical resistance when used as a connecting wire.

Assertion: Lungs always contain a residual volume of air.

True

Reason: The presence of residual volume of air provides sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.

correct.