Question

which of the following are included under phloem
A)Sieve cells
B)Sieve tubes
C)Companion cells
D)all of these

Answer 1

Answer:

sieve tubes and companion cells...

Answer 2

Option D is the correct answer.

• Phloem is accountable for the transfer of nutrition.
• Phloem comprises four categories of cells i.e. sieve tubes, companion cells, phloem fibre, and phloem parenchyma.
• Phloem parenchyma has thick cytoplasm and a nucleus.
• Sieve tubes possess peripheral cytoplasm and huge vacuole but the scarcity of a nucleus.
• Phloem companion cells are parenchymatous and these possess a nucleus.
• companion cells are also the living cells of phloem. Phloem fibres are deceased. It possesses a heavy fence and requires a cytoplasm.
• Sieve tubes have an inadequacy of the nucleus. The purpose of the sieve tube is governed by the nucleus of companion cells. Sieve tubs possess the purpose for translocation of nutrition in plants for this tension gradient is conserved by companion cells so the companion cell assists sieve tubes in the translocation of food.

Hence, option D is the correct answer.

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