Tyloses thickening is seen in
collenchyma
phloem cells
ray parenchyma only
ray parenchyma and xylem cells
Tyloses are balloon like structures produced by the ray parenchyma and xylem.
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.
Assertion (A): Xylem is composed of different kinds of elements. Reason (R): Xylem parenchyma cells are living and thin walled. The main function of xylem parenchyma is to store starch and fatty substances.
Differentiate between cells of : (a) Parenchyma and collenchyma (b) Meristematic tissue and permanent tissue (c) Sclerenchyma and parenchyma (d) Cells of involuntary and voluntary muscle (e) Fibres of voluntary muscle and cardiac muscle.