Question

Refer the given figure and select the correct option regarding it.

• A. P are dead sclerenchyma fibres that provide mechanical strength.
• B. Q helps in maintaining pressure gradient.
• C. R is the main conducting part of the phloem formed of cylindrical cells.
• D. S is living parenchyma cell that stores food.

Answer 1

The correct option is B Q helps in maintaining pressure gradient.

The given figure is of phloem tissue. Here P are sieve tubes. These are elongated tubular conducting channels which are placed end to end. Q represents companion cell which is thin walled living cell. Companion cells help in maintaining a proper pressure gradient in the sieve tube elements. R is phloem parenchyma which stores food, resins, latex, etc. S depicts sieve plate that connects the protoplast of adjacent sieve tube members.

So, the correct answer is 'Q helps in maintaining pressure gradient'.