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Which is/are correct statement/s?...

Which is/are correct statement/s?

A

In flowering plants, tracheids and vessels are the main water transporting elements.

B

In gymnosperms, tracheids are the chief water transporting elements

C

The companion cells play an important role in the maintenance of a pressure gradient in the sieve tubes

D

All of these

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The correct Answer is:
D
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