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Standard IX
Biology
Transportation in Plants
What is compa...
Question
What are companion cell and phloem fibers?
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Solution
Phloem:
It is the vascular tissue in plants.
Food supplies are transported via phloem from leaves to other plant sections.
Phloem comprises companion cells, sieve tube elements, phloem fibres, and phloem parenchyma.
Companion cells:
Companion cells are parenchymatous cells with specialized functions.
Pit fields connect the sieve tube elements and companion cells between their common longitudinal walls.
They aid in maintaining the sieve tubes' pressure gradient.
Phloem fibres:
Sclerenchymatous cells make up phloem fibres.
These are long and unbranched, with sharp, needle-like apices.
Phloem fibres have a very thick cell wall.
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Q.
Phloem fibers are
Q.
Phloem fibers are made up of which type of tissue?
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.
Companion cells in phloem are found in______
Q.
Assertion :Death of companion cell leads to the death of sieve cells also. Reason: Both companion and sieve are phloem cells.
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