Question

Stomata tend to close during hot period and open during cooler hours in
A. Potato type
B. Barley type
C. Cereal type
D. Lucerne type

Answer 1

Hint: Stomata are specialized epidermal cells which are essential for the survival of plants. It has two guard cells and a pore i.e stoma. This stoma allows the exchange of \[C{O_2}\] and \[{O_2}\] which is an essential product in the process of photosynthesis. This restricts the loss of water loss thus less transpiration.

Complete answer:
The guard cells around the stomatal opening have the tendency to evaluate the temperature and Environmental changes which control the stomatal aperture opening. This also regulates the gas exchange. This opening and closing further regulates the water loss from the plant cells. Abscisic acid is the stress hormone that regulates the closure of stomata. Jasmonic acid and nitric acid also stimulate closure in drought like conditions. Stomata are specialized epidermal cells which are essential for the survival of plants. It has two guard cells and a pore i.e stoma. This stoma allows the exchange of carbon dioxide and oxygen which is an essential product in the process of photosynthesis. This restricts the loss of water loss thus less transpiration. In case of cereal or barley, stomata remain open only for a few hours in the day time and are closed for the remaining day. In potato type, stomata remain open day and night except for some hours in the evening. In case of lucerne, stomata tend to close during the hot day period and open during the cooler hours.

So the correct answer is D.

Note:
In case of cereal or barley, stomata remain open only for a few hours in the day time and are closed for the remaining day. In potato type, stomata remain open day and night except for some hours in the evening. In case of lucerne, stomata tend to close during the hot day period and open during the cooler hours.