Give three ways in which phloem tubes differs from the xylem vessels.

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Solution

PHLOEM TUBES XYLEM VESSELS
It is a part of phloem tissue.
It is a part of xylem tissue.
It is a long distance channel made up of living cells and vacuolated cytoplasm.
It is a long distance channel made up of a number of dead cells with a hollow lumen.
It conducts food or organic nutrients.
It conducts water and mineral salts.
The wall is unlignified and thin.
The wall is lignified and thick.
The end walls are perforated to form sieve plates.
The end walls are dissolved completely.
It does not provide any mechanical strength.
It provides mechanical strength.

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Mature sieve tubes differ from xylem vessels in:

What substance/substances are transported in plants by :
(a) xylem vessels and tracheids ?
(b) sieve tubes (or phloem) ?

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?

Q. Arteries, veins, capillaries, xylem vessels, and phloem tubes are all tubes used for transporting substances in mammals and flowering plants. Describe how each of these tubes is adapted for its particular function.

Which of the following statements are correct?

(i) Companion cells are present in phloem.
(ii) Xylem transports water and minerals from roots to other parts of the plant.
(iii) Vessels of xylem are present in all plants.
(iv) Both xylem parenchyma and phloem parenchyma have nucleus.

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PHLOEM TUBES	XYLEM VESSELS
It is a part of phloem tissue.	It is a part of xylem tissue.
It is a long distance channel made up of living cells and vacuolated cytoplasm.	It is a long distance channel made up of a number of dead cells with a hollow lumen.
It conducts food or organic nutrients.	It conducts water and mineral salts.
The wall is unlignified and thin.	The wall is lignified and thick.
The end walls are perforated to form sieve plates.	The end walls are dissolved completely.
It does not provide any mechanical strength.	It provides mechanical strength.