Which of the following tissues affected by defoliators are least important to tree growth?

A) Old foliage late in the season

B) New foliage early in the season

C) Old foliage early in the season

D) Shade leaves

E) New foliage late in the season

Question

Which of the following tissues affected by defoliators are least important to tree growth?

A) Old foliage late in the season

B) New foliage early in the season

C) Old foliage early in the season

D) Shade leaves

E) New foliage late in the season

BlackTom AI · Accepted Answer

To analyze which tissues affected by defoliators are least important to tree growth, we need to consider the role and timing of each tissue in the tree's physiology.
Option D: Shade leaves. These leaves, though not primary production sites like new leaves, still contribute to photosynthesis, especially under lower light conditions; removing shade leaves can reduce the tree’s overall carbon gain, so this tissue is relatively important.
Option E: New foliage late in the season. New leaves late in the season may not have much time to contribute to photosynthesis before the season ends, but they can store carbohydrates and help with next year’s growth; however, they still participate in growth processes, so they are more important than mere old senescent tissue.
Option C: Old foliage early in the season. Old leaves at the start of the season may still photosynthesize during their early life and provide resources for growth, meaning they have a nontrivial role, though less critical than actively expanding tissues later.
Option A: Old foliage late in the season. Leaves that are old and late in the season are largely nearing senescence and contribute little to current photosynthetic output; their removal or loss during defoliation tends to have a smaller impact on immediate growth compared with tissues that are actively expanding or photosynthesizing earlier in the season.
Option B: New foliage early in the season. Young leaves early in the season are typically high in photosynthetic capacity and drive a large portion of the tree’s early-season growth and carbon gain, making them highly important for growth.
In summary, tissues that are actively growing or photosynthesizing—such as new leaves early in the season, shade leaves, or possibly old foliage early in the season—tend to contribute more to current growth than old foliage late in the season, which is waning in its contribution by that point in time. Therefore, among the listed options, old foliage late in the season is the least critical to supporting ongoing growth during the growing period.

Which of the following tissues affected by defoliators are least important to tree growth? A) Old foliage late in the season B) New foliage early in the season C) Old foliage early in the season D) Shade leaves E) New foliage late in the season单项选择题

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