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Complex Permanent Tissue

The dead elem...

Question

The dead element present in the phloem is ___.
(A) companion cell
(B) phloem fibre
(C) phloem parenchyma
(D) sieve tube

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Solution

Answer: (B) phloem fibre
Phloem consists of four elements: Sieve tubes, companion cells, phloem parenchyma and phloem fibres. Except for phloem fibres, all other elements are living. Phloem fibres are thick-walled, elongated spindle-shaped dead cells which possess narrow lumen. They provide mechanical support to the plant.

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Q. while writing about phloem in last class, we wrote about sieve tube, companion cell and phloem parenchyma but not about phloem fibre. am i right?

Q. The dead element present in the phloem is

a. companion cells
b. phloem fibres
c. phloem parenchyma
d. sieve tubes

Q. Match the following.

A. Sieve tubes	1. Sclerenchymatous
B. Companion cells	2. Perforated end walls
C. Phloem parenchyma	3. Connected to sieve tubes
D. Phloem fibres	4. Dense cytoplasm

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. Consider the following statements
(a) Xylem transports water and minerals
(b) Gymnosperms lack sieve tubes and companion cells in phloem
(c) First formed primary xylem is called metaxylem
(d) Phloem fibres (bast fibres) are made of collenchyma
Of these statements

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