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B
Germinating seeds
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C
Tip of stem
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D
Adult organs
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Solution
The correct option is D
Adult organs
The correct option is (D):
Explanation of the correct option:
Adult organs like stem, leaves, and roots respire at a slower pace than other plant parts.
They exchange gases and fulfill their energy requirements separately; stem by lenticels, leaves by stomata and roots by air gaps/spaces found between the soil particles.
As they are fully matured, their energy requirements are not high and show lower rates of respiration.
Explanation of the incorrect options: Option (A):
Vegetative buds are growing parts and need more energy to divide and develop into leafy shoots.
Therefore, they respire at a faster rate.
Option (B):
The embryos of germinating seeds require more energy to develop into a new plant.
Hence, they show higher rates of respiration.
Option (C):
The growing tip of the stem consists of meristematic cells which need more energy to increase the plant length.