Which of the following is living but non-nucleated ? a) phloem cell b) sieve tube c) companion cell d) phloem parenchyma

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Solution

Sieve tube

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Question 22
The dead element present in the phloem is

(a) companion cells
(b) phloem fibres
(c) phloem parenchyma
(d) sieve tubes

Q. During phloem transportation sugar is moved in form of sucrose in to the companion cells and them into the living phloem sieve tube cells by -

Q. Read the following statements:

(i) The sieve tube elements and companion cells are connected by pit fields present between their common longitudinal walls.
(ii) Phloem parenchyma is made of elongated non-tapering cylindrical cells that have a scanty cytoplasm.
(iii) Phloem fibers are made of parenchymatous cells.
(iv) Companion cells help in maintaining the pressure gradient in the sieve tube.
(v) The phloem parenchyma stores food material and other substances like resins, latex, and mucilage.

How many of the given statements are correct?

Q. Assertion :Death of companion cell leads to the death of sieve cells also. Reason: Both companion and sieve are phloem cells.

Both phloem sieve tube cells and xylem vessel cells are derived from same kind of precursor cells but at maturity they are different. What feature is unique to phloem sieve tube cells?

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