PLANT PHYSIOLOGY
PLANT GROWTH
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Primary growth is the increase in girth of axis due to activity of Apical meristem
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Secondary growth is the increase in girth due to activity of lateral meristem (vascular cambium & cork cambium)
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Elongation of plant is the primary growth
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b and c
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Detailed explanation-1: -So, the correct option is ‘Secondary growth’.
Detailed explanation-2: -Lateral meristem is responsible for the increase in the girth of the stem. It is found beneath the bark (called cork cambium) and in vascular bundles of dicot roots and stems (called vascular cambium) as thin layers. It is composed of such initials which divide mainly in one plane and increases the girth of the stem.
Detailed explanation-3: -Primary growth results in the increase in length of the primary plant body. Primary growth occurs at the apical meristem (a meristem located at the tip of a stem). A meristem is a region of undifferentiated cells from which new cells arise through cellular division.
Detailed explanation-4: -The increase in length of the shoot and the root is referred to as primary growth, and is the result of cell division in the shoot apical meristem. Secondary growth is characterized by an increase in thickness or girth of the plant, and is caused by cell division in the lateral meristem.
Detailed explanation-5: -Secondary growth is characterized by an increase in thickness or girth of the plant. It is caused by cell division in the lateral meristem. Herbaceous plants mostly undergo primary growth, with little secondary growth or increase in thickness.