Which of the following is responsible for the growth in circumference or girth of stem and root in plants (in crucifers)?

Xylem

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Phloem

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Cortex

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Cambium (meristematic tissue)

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Solution

The correct option is D Cambium (meristematic tissue)
The increase in lateral thickening is called as secondary thickening or secondary growth. This growth occurs in stem and root in dicotyledons. This development takes place in stele (interstellar secondary growth) and also in the cortex (extra stellar secondary growth). Both interfascicular and intrafascicular cambiums join to form a complete ring of cambium called as vascular cambium, which initiates interstellar secondary growth.

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\begin{matrix} T y p e o f m e r i s t e m a t i c t i s s u e & L o c a t i o n & F u n c t i o n i . A p i c a l m e r i s t e m & T i p o f s t e m a n d r o o t s & I n c r e a s e i n l e n g t h i i . L a t e r a l m e r i s t e m & L a t e r a l l y p l a c e d i n s i d e s t e m a n d r o o t & I n c r e a s e i n g i r t h i i i . I n t e r c a l a r y m e r i s t e m & B a s e o f l e a v e s a n d i n t e r n o d e s & G r o w t h o f l e a v e s a n d s t e m \end{matrix}

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