Question

The droplets of water arranged at the edges of leaves of roses in the morning are:

• A. Water drops condensed from the atmosphere during night at low temperature.
• B. Water transpired from the stomata and lenticels.
• C. Water produced on the leaves from the reaction of hydrogen and atmospheric oxygen.
• D. None of the above.

Answer 1

The correct option is B Water transpired from the stomata and lenticels.

Transpiration is the evaporative loss of water by plant. When the soil is too wet, water penetrates the plant through its roots and this creates pressure that forces the water to exit the plant in the form of droplets.

This process doesn’t occur during the day, because the leaf’s stomata are open at that time.

It occurs when the stomata close down, i.e. at night and water pressure begins to build up.

Therefore, the droplets can be noticed when the sun comes up in the morning, before the drops evaporate.

So, the correct answer is B.