Question

Sieve tubes and companion cells are present in (a) xylem (b) phloem (c) cork (d) cambium

Answer 1

Sieve tubes and companion cells are a part of phloem(b).

Answer 2

Sieve tubes and companion cells are present in (b) phloem.

• Xylem and phloem are conducting tissues.
• Xylem transport water and minerals while phloem transports food material to the plant parts such as stems, roots and leaves.
• Xylem transport is mainly through transpiration pull.
• Xylem elements include a vessel, tracheids, xylem fibres and xylem parenchyma.
• Phloem elements include sieve elements, companion cells phloem fibres and phloem parenchyma.
• Cork is dead and they don't have conductive tissues xylem and phloem. they have closely arranged cells.
• Secondary growth in plants takes place due to actively dividing cells of cambium. cambium is present between the xylem and phloem.