Long tube like cells which are the main cells of the phloem are ______________.

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Solution

Phloem:
Phloem is a conducting vascular tissue.
It conducts the food materials from leaves to various parts of the plant.
It consists of sieve tubes, companion cells ,phloem parenchyma and phloem fibres.
Sieve tubes are formed by the elongated living cells with porous end plates.
Final answer: Long tube like cells which are the main cells of the phloem are sieve tubes.

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The human body contains a large number of cells A which are very long and branched, and look like electric wires. The longest branch of this cell is B whereas there are many small branches C. Any two A cells do not join to one another completely in the human body. There is a microscopic gap D between every pair of adjacent A cells through which electric impulses can pass by the release of a chemical substance.

(a) What are cells A ?

(b) What is the name of (i) branch B, and (ii) branches C ?

(d) What is the function of cells like A in the human body ?

(e) The cells A are of three types. Name the three types.

Question 2

They are pipe-like, consisting of a group of specialised cells. They transport substances and form a two-way traffic in plants. Which of the following terms qualify for the features mentioned above?

(a) Xylem tissue

(b) Vascular tissue

(d) Phloem tissue

Long tube like cells which are the main cells of phloem are ____.

Sucrose enters a phloem sieve-tube cell because of

Q. The human body contains a large number of cells A which are very long and branched, and look like electric wires. The longest branch of this cell is B whereas there are many small branches C. Any two A cells do not join to one another completely in the human body. There is a microscopic gap D between every pair of adjacent A cells through which electric impulses can pass by the release of a chemical substance.
(a) What are cells A?

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