What is primary meristem and secondary meristem? Explain in detail.

The primary meristem belongs to the embryonic cells hence they are involved in the cell division and growth of a plant. For example: apical meristem of shoot apex and root apex.

The secondary meristem is the meristematic tissue that arises from permanent tissues. It is responsible for the increase in thickness of the plant. For example: vascular cambium and cork cambium.

Both primary meristem and secondary meristem are parenchymatous cells. Their cells are closely packed, have prominent nucleus and granular cytoplasm.