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Possible explanations for the age related decline in primary productivity of trees are:
P. As trees grow larger with age, they have more tissues that respire and lose energy and proportionately less leaf area to photosynthesize.
Q. Nutrient limitation by nitrogen due to reduced rate of woody litter decomposition as forest ages.
R. As trees become larger, water transport to the top canopy leaves becomes limited because of increased hydraulic resistance. This results in reduced stomatal conductance and reduction in photosynthetic rate.
Which of the above is/are correct?
P, Q and R
Only P
Only P and R
Only Q and R
Answers (1)
As trees grow larger with age, they generally have more leaf area available for photosynthesis, not less. This is because the increase in tree size often corresponds to an increase in canopy size and foliage. Therefore, the proportion of leaf area available for photosynthesis usually increases with tree age. The increase in respiratory activity with age may still be a factor, but it is not directly related to a decrease in leaf area for photosynthesis.
Therefore, statement P is wrong. Hence, the correct answer is option 4.
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