Question

Which of the following have sunken stomata?
A. Nerium
B. Mangifera
C. Hydrilla
D. Zea mays

Answer 1

Hint: In a small pit a sunken stomata is a stomata, which protects the escaping water vapour from air currents, decreasing water loss from the leaf. In arid environments one of their adaptations to preserve water sunken stomata are commonly found in plants.

Complete Answer:
Let’s discuss the question and find the correct answer.

Option A: Nerium is a xerophyte it has sunken stomata to curtail the water loss by transpiration. To reduce water loss through transpiration Xerophytic plants such as Nerium have sunken stomata. Therefore, this is the correct option.

Option B: In Mangifera there are very stomata and the plant is hypostomatic. The stomata present are not sunken. Therefore, this is the incorrect option.

Option C: Hydrilla are the small, white to yellowish, and do not contain any stomata as it is a submerged aquatic plant. Therefore, this is the incorrect option.

Option D: The stomata of Zea mays is made up of two pore forming guard cells and it has two adjacent subsidiary cells. It does not have sunken stomata. Therefore, this is the incorrect option.

Thus, the correct option is A) Nerium.

Note: Function of stomata are as follows,
- It opens and closes the pores in the leaves for an exchange of gases.
- It allows the plant to take in carbon dioxide and give out oxygen for photosynthesis.
- Depending on the weather conditions, it closes or opens its pores to keep the moisture content developed.