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Question

The healing of wounds of plants takes place due to the activity of


A
intercalary meristem
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B
secondary meristem
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C
promeristem
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D
apical meristem
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Solution

The correct option is B secondary meristem
If the cells of the meristem originated from cells that had differentiated and again resumed meristematic activity, the meristem is known as secondary meristem. It is responsible for the secondary growth of the plants which includes the increase in the girth of the plant.
When a plant gets injured, new tissues are formed by the activity of the secondary meristems. These normally include tissues such as parenchyma and collenchyma that gain the ability to divide by undergoing a phenomenon called dedifferentiation by which the permanent tissue becomes meristematic.

Intercalary meristems are named after the position of the meristematic tissue in the plants. The intercalary meristems are formed from the apical meristems as the latter continues to divide. The intercalary meristems help in increasing the length of the plant and is most commonly seen in monocots.

Promeristems or the embryonic meristems are the first formed meristematic tissues. They are short-lived and give rise to the primary meristems.

Apical meristems are found in the root and shoot apex and are responsible for the increase in the length of the plant axis.

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