Conduction of food materials does not take place in mature sieve tube elements because
Important Questions on Tissue and Tissue System
Identify the tissues based upon the following characters respectively:
| I) Large, colourless, empty cells along with leaf veins are used for absorption of water | A) Axillary bud |
| II) Cells much elongated, unbranched with pointed needle like apices and thick cell wall are dead at maturity | B) Phloem fibre |
| III) The cells are longitudinally arranged with perforated end walls | C) Bulliform cells |
| IV) Cells left behind from shoot apical meristem | D) Sieve tube elements |
Which of the following is an incorrect statement?
Which of the following are the characteristic features of phloem?
i) Gymnosperms have albuminous cells and sieve cells
ii) Presence of tracheids
iii) They store food materials in the form of starch or fat
iv) They have sieve tube elements that are long, tube-like structures
v) Their end walls are perforated in a sieve like manner
The correct combination is
I. Phloem transports the food materials usually from the leaves to other parts of the plant.
II. Phloem in the angiosperm is composed of sieve tube elements, companion cells, phloem parenchyma and phloem fibres.
Identify which of the following statement is correct and select the correct option.
