Question

Given below are figures (A) and (B) showing open and closed stomatal apertures respectively.

Answer the questions that follow:

1. When do these stomata open (day/night)?
2. What is the condition of the guard cells when the stomata are open (turgid/flaccid)?
3. Name the gas taken in and released out through these pores during photosynthesis.
4. Name the cells of the lower epidermis that contain chloroplasts.
5. Write two characteristic features of both the inner and outer walls of the guard cells.

Answer 1

1. Stomata open during the day.
2. The guard cells become turgid when stomata are open.
3. During photosynthesis, the gas taken in through these pores is carbon dioxide, and the gas released is oxygen.
4. The cells of the lower epidermis that contain chloroplasts are the guard cells.
5. • Characteristic features of inner wall:
     1. They are thick.
     2. They are less elastic.
   • Characteristic features of outer wall:
     1. They are thin.
     2. They are more elastic.