Assertion :Realised natality is always less than potential natality. Reason: Their ratio determines the normal growth rate of population.

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 C Assertion is correct but Reason is incorrect
Natality is the number of death taking place in the population. The potential natality is always considered to be slightly higher than the realised natality because it is just an estimation of the number of deaths.

This death to birth ratio determine the normal growth of a population and is an important development of statistics but not just the natality ration.

So, the correct option is 'Assertion is correct but Reason is incorrect'

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If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

Assertion: Be and Al have similar properties.

Reason: $B e^{2 +}$ and $A l^{3 +}$ have nearly the same charge/volume ratios and similar polarising power.

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