Question

Q. 95. Protophloem differs from metaphloem as the former lacks
a) Sieve tubes
b) Companion cells
c) Bast fibers
d) Phloem parenchyma ​

Answer 1

Explanation:

Phloem parenchyma

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Answer 2

Answer:

Protophloem differs from meta-phloem as the former lacks b) Companion cells

Explanation:

• Phloem refers to one of the permanent complex tissue, responsible for the transportation of food materials from the source to the sink in plants.

• Also called the bast that is composed of

1. slender-tube like sieve tubes,

2. specialised parenchymatous companion cells,

3. thin-walled living phloem parenchyma and

4. elongated sclerenchymatous phloem fibres.

• This complex vascular tissue undergoes primary and secondary growth.
• Procambium differentiation during primary growth results in primary phloem i.e. protophloem and metaphloem.
• Protophloem is the primarily formed phloem.
• Both these primary phloems possess all the components except companion cells in the protophloem.

Hence option b) Companion cells is correct.