Question

ch03.09
plants respire ______.
a. through roots only
b. through their leaves
c. 24 hours a day
d. only in poorly drained soil

Explanation:

To determine how plants respire, we analyze each option:

• Option a: Plants do not respire only through roots. They have other structures (like leaves, stems) involved in gas exchange for respiration.
• Option b: Respiration isn't limited to leaves. Roots, stems, etc., also respire.
• Option c: Respiration is a continuous process in plants, occurring 24 hours a day (as it's needed for energy production, unlike photosynthesis which needs light).
• Option d: Plants respire in all soil types (well - drained or poorly drained), as long as there is sufficient oxygen for cellular respiration. So the correct answer is based on the fact that respiration is a constant metabolic process in plants.

Answer:

c. 24 hours a day