Question

19. End walls of sieve tubes are
perforated and are called
Companion cells
Fibres Sieve plates​

Answer 1

Answer:

The end walls of sieve tubes are perforated to form sieve plates. A mature sieve element has a peripheral cytoplasm and a large vacuole but no nucleus. The nucleus of the companion cell controls the function of sieve element. Companion Cells: These are specialized parenchymatous cells.

Step-by-step explanation:

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