Which of the following cells helps in ma...

Which of the following cells helps in maintaining the pressure gradient in the sieve tubes?

A

Pholem parenchyma

B

Bast fibre

C

Companion cells

D

Wood fibre

Text Solution

Verified by Experts

The correct Answer is:

C

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Assertion: The companion cells help in maintaining the pressue gradient in sieve tube Reasons: The companion cells are specialished parenchymatous cells which are closely associated with sieve tube elements

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Knowledge Check

Select true statements - (A) Bast fibres are made up of sclerenchymatous cells. (B) The companion cells help in maintaining the pressure gradient in the sieve tubes. (C) Phloem parenchyma is absent in Zea mays stem

A

Only A and B

B

Only B & C

C

Only C

D

All A, B, and C

Assertion :- Companion cells are essential for functioning of sieve tubes. Reason :- The companion cells help in maintaining the pressure gradient in sieve tubes.

A

If both Assertion & Reason are True & Reason is a correct explanation of the Assertion.

B

If both Assertion & Reason are True but the Reason is a correct explanation of the Assertion.

C

If Assertion is True but the Reason is False.

D

If both Assertion & Reason are false.

Consider the following statements 1. Xylem vessels are semi-permeable 2. Sieve tubes translocate only solutes 3. Xylem vessels do not have a turgor pressure 4. Companion cells help in maintaining pressure gradient in the sieve tubes . Which of the statements given above are correct ?

A

1 and 2

B

2 and 3

C

1 and 3

D

2 and 4

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Sieve tube is -

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