Viruses usually infect the whole plant except the

Stem apex

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Cortex

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Pith

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Phloem

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Solution

The correct option is A Stem apex
Viruses usually infect the whole plant except the stem apex, because in the apex of shoot i.e., shoot meristems are regularly dividing. So virus cannot grow at stem apex due to high mitotic activity.
So, the correct answer is option A.

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