Which of the following exhibits the highest rate of respiration?
A
Growing shoot apex
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B
Germinating seed
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C
Root tip
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D
Leaf bud
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Solution
The correct option is B Germinating seed
Different tissues and organs respire at different rates. A useful
rule of thumb is that the greater the overall metabolic activity of
given tissue, the higher its respiration rate. Germinating seeds exhibit
the highest rate of respiration. Developing buds usually show very high
rates of respiration and respiration rates of vegetative tissues
usually decrease from the point of growth to more differentiated
regions. When a plant tissue has reached maturity, its respiration rate
will either remain roughly constant or decrease slowly as the tissue
ages and ultimately senescence.