Question

Which of the following plant parts can respire even in the absence of O₂?

• A. Seeds
• B. Roots
• C. Stems
• D. Leaves

Answer 1

The correct option is A

Seeds

The correct option is (A)

Explanation for the correct option:

1. Seeds can respire in the absence of oxygen i.e. in anaerobic conditions.
2. This is generally seen in germinating seeds as seed germination is an energy-driven process, seeds undergo anaerobic respiration to release energy in the absence of oxygen.

Explanation of incorrect options:

Option (B):

1. Roots respire in the presence of oxygen and root cells die in anaerobic conditions.

Option (C):

1. Stems are able to respire and exchange gases from the atmosphere due to the presence of stomata and lenticels.
2. However, in the absence of oxygen stem cells undergoes death.

Option (D):

1. Plant leaves cannot undergo anaerobic respiration and the leaf cells die in the absence of oxygen.

Final answer: Seeds can respire even in the absence of O₂.