| Column-I | Column-II | ||
| A. | Formative | I. | Plastic extension through the enzymatic loosening of microfibrils |
| B. | Phase of enlargement | II. | Cell develops into special or particular type of cells. |
| C. | Phase of differentiation | III. | New cells are produced by mitosis |
A) A-I; B-II; C-III
B) A-I; B-III; C-II
C) A-III; B-II; C-I
D) A-III; B-I; C-II
Correct Answer: D
Solution :
[d] Plant growth takes place in three phases; (i) Formative phase: It is also called the phase of cell formation or cell division. New cells are produced by mitotic division of the pre- existing cells. Mitosis adds new cells to the body. (ii) Phase of enlargement: The newly formed cells in formative phase undergoes enlargement. Cell wall of enlarging cell shows plastic extension through enzymatic loosing or microfilament and deposition of new material called intussusception. (iii) Phase of differentiation: The enlarged cells develop into special or particular type of cells by undergoing structural and physiological differentiation.
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