Q10 of 36 Page 1

Veins are thin walled and have valves. Justify

Veins have thin walls because the blood is no longer under pressure in them as they merely collect blood from the body to transport it to the heart. Valves are present in veins to ensure blood flow in one direction.


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Draw the magnetic field lines around a straight current carrying conductor.

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Two unequal resistances are connected in parallel. If you are not provided with any other parameters (eg. numerical values of I and R), what can be said about the voltage drop across the two resistors?

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OR


Give reason why a food chain cannot have more than four trophic levels.