Fill in the blanks with the keywords provided below.

---

[oxygen] • [gaseous exchange] • [water loss] • [respiration] • [transpiration] • [stomata] • [night] • [water vapour]

---

a) What are the tiny openings on the surface of the leaf called? What are the gases moving in and out through these openings during the day?

Answer:

. They enable the plant to take in carbon dioxide and to give out in order to carry out photosynthesis.

b) What other gases are given out by the plant through the stomata?

Answer:

moves out through the stomata. This process is known as .
During the , the plant releases carbon dioxide through the stomata.

c) Most stomata are found on the underside of leaves. Explain why this is beneficial to plants.

Answer:

Compared to the upper surface, the underside of a leaf has a lower temperature since it is not exposed to direct sunlight.
This will reduce the rate of transpiration, thus reducing .

d) Explain why the water lily has stomata on the upper surface of its leaves.

Answer:

The leaves of the water lily float on the water surface. The bottom part is exposed to water while the top surface is exposed to the air.
The stomata on the upper surface of the leaves allow the water lily to carry out for photosynthesis and .