Assertion The lenticel is meant for gaeous exchange .
Reason Lenticel checks excessive evaporation of water.

The questions given below consist of an assertion and the reason. Use the following key to choose the appropriate answer. (a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. (b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.(c) Assertion is is CORRECT but reason is INCORRECT. (d) If assertion is INCORRECT but reason is CORRECT. (e)If both assertion and reason are INCORRECT. Assertion: In ZnO the excess Zn^(2+) ions are present interstitial sites. REason: Metal excess crystals have either missing cation or anin in intertitial site.

Which of the following processes are chemical changes? Give reasons. Evaporation of water.

Why plants have no specialised organs for gaseous exchange but they have stomata and lenticels for this purpose?

Assertion: Presence of large amounts of nutrients in water body causes excessive growth of planktonic algae. Reason : It is due to biomagnifications

Assertion: Presence of large amounts of nutrients in water body causes excessive growth of planktonic algae. Reason : It is due to biomagnifications

Assertion : van Arkel method is used for refining of Zinc. Reason : In this method impure is evaporated to obtain the pure metal as distillate .

Assertion : van Arkel method is used for refining of Zinc. Reason : In this method impure is evaporated to obtain the pure metal as distillate .

Assertion : When the ambient temperature is high and soil contains excess of water, the plants tend to lose water in the form of droplets from lenticels. Reason : Root pressure regulates the rate of loss of water form lenticels.