Question

question 8. the diagram below shows a cross - section of a plant leaf. how does the structure marked x contribute to the survival of the plant? a. it allows the intake of sunlight necessary for atp production. b. it allows the intake of gases necessary for photosynthesis. c. it allows the intake of sugars necessary for plant reproduction. d. it allows the intake of minerals necessary for plant growth.

Explanation:

The structure marked X is a stoma. Stomata are pores on the leaf surface that allow for gas exchange. In photosynthesis, plants take in carbon dioxide (\(CO_2\)) and release oxygen (\(O_2\)). This gas exchange is essential for the process of photosynthesis to occur.

• Option A: Sunlight intake is not related to stomata. Chlorophyll in the leaf cells is responsible for absorbing sunlight.
• Option B: Sugars are produced through photosynthesis (using \(CO_2\), water, and sunlight) and transported through phloem, not related to the function of stomata in gas exchange.
• Option C: Stomata allow the intake of \(CO_2\) (a gas) which is necessary for photosynthesis (\(6CO_2 + 6H_2O

ightarrow C_6H_{12}O_6+6O_2\)).

• Option D: Minerals are absorbed by the roots from the soil, not through stomata.

Answer:

C. It allows the intake of gases necessary for photosynthesis.