| (i) Primary growth involves increase in girth of plants. |
| (ii) Increase in girth of plants occurs due to apical meristem. |
| (iii) Secondary growth of plants occurs due to lateral meristem. |
| (iv) Vascular cambium and cork cambium are the lateral meristems of plants. |
| (v) Elongation of a plant along the axis is called primary growth. |
A) (i) and (ii)
B) (iii) and (iv)
C) (iv) and (v)
D) (i) and (v)
Correct Answer: A
Solution :
[a] (i) Elongation of plant along the axis is called the primary growth. (ii) Primary growth happens due to the presence of root apical meristem and shoot apical meristem. Root apical meristem (RAM), shoot apical meristem (SAM) and Intercalary meristem are responsible for the primary growth of the plants and they principally contribute to the elongation of the plants along their axis. In the dicotyledons and gymnosperms, the lateral meristems, vascular cambium and cork cambium appear later in life. These are the meristems that cause increase in the girth of the organ in which they are active. This is known as the secondary growth of the plant.
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