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Question
Callose is a characteristic of
Callose is a characteristic of
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Solution
The correct option is A Old sieve tube
Callose, a β-1-3-glucan, is a carbohydrate which is also deposited at the sieve plate in response to injury. However, there is some question as to whether the callose is deposited immediately in response to injury or if it is a secondary response to the manipulation required to view a sieve element microscopically.
Accumulation of callose also occurs in an old, non-functional sieve elements and likely seals the old elements closed to keep the phloem translocation stream active. So, callose is a characteristic of old sieve tubes and not of tracheid, sclerenchyma and companion cells.
Thus, the correct answer is option A.
Callose, a β-1-3-glucan, is a carbohydrate which is also deposited at the sieve plate in response to injury. However, there is some question as to whether the callose is deposited immediately in response to injury or if it is a secondary response to the manipulation required to view a sieve element microscopically.
Accumulation of callose also occurs in an old, non-functional sieve elements and likely seals the old elements closed to keep the phloem translocation stream active. So, callose is a characteristic of old sieve tubes and not of tracheid, sclerenchyma and companion cells.
Thus, the correct answer is option A.
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