- ALateral
- BApical
- CIntercalary
- DSecondary
Explanation:
Secondary growth in dicot stem occurs by increase in lateral thickening which is also called as secondary thickening or secondary growth.
Vascular cambium initiates intrastelar secondary growth.
Hence, vascular cambium grows by division of lateral meristem.
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$A$. Lenticels are the lens-shaped openings permitting the exchange of gases.
$B$. Bark formed early in the season is called hard bark.
$C$. Bark is a technical term that refers to all tissues exterior to vascular cambium.
$D$. Bark refers to periderm and secondary phloem.
$E$. Phellogen is single-layered in thickness.
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