MCQ
Thickness of stem increase due to activity of:
- ACambium
- BXylem
- CPhloem
- DShoot apex
Explanation:
Secondary growth refers to the growth that results from cell division in the cambium or lateral meristems and that causes the stems and roots to thicken, while primary growth is growth that occurs as a result of cell division at the tips of stems and roots, causing them to elongate and gives rise to primary tissue.
Secondary growth occurs in most seed plants, but monocots usually lack secondary growth.
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$I.$ $O_{2}$ helps in releasing metabolic energy, which is essential for growth
$II.$ Nutrients are required by plants for the synthesis of protoplasm
$III.$ Change in temperature could be the detrimental for the survival of an organism
$IV$. Light and gravity don't affect the stages of growth
Choose the correct option