NEET BIOLOGY

Detailed explanation-1: -In many vascular plants, secondary growth is the result of the activity of the two lateral meristems, the cork cambium and vascular cambium.

Detailed explanation-2: -The secondary growth of plants increase in stem thickness and it is due to the activity of the lateral meristems, which are absent in herbs or herbaceous plants. There are two types of lateral tissues involved in secondary growth, namely, vascular cambium and cork cambium.

Detailed explanation-3: -Secondary growth occurs at the lateral meristems. The cells at the meristems undergo cellular division, where each cell multiplies into two daughter cells and add to the cellular material collectively called tissue. Secondary growth in plants produces secondary phloem and xylem.

Detailed explanation-4: -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 axis.

Detailed explanation-5: -As mentioned earlier, secondary growth occurs due to the lateral meristems that divide similar to the apical meristems. The cells of the lateral meristems divide rapidly and grow outwards laterally rather than apically as in case of primary growth. The lateral meristems that cause secondary growth are known as cambium.