Which is responsible for secondary growth of root and stem ?

Cambium

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Apical meristem

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Intercalary meristem

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Xylem and phloem

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Solution

The correct option is B Cambium
Cambium is the layer of actively dividing cells between xylem and phloem tissues that is responsible for the secondary growth of stems and roots. The cambium produces new layers of phloem on the outside and of xylem on the inside, thus increasing the diameter of the stem. Apical and intercalary meristems involve in primary growth. Xylem and phloem involve in the transport of water and nutrients in plants and does not involve in growth. So, option A is correct.

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Q. The growth of the root and stem in length with the help of apical meristem is called _________

Q. Which of the following meristems is responsible for extra stellar secondary growth in dicotyledonous stem?

Q. Which meristem is responsible for the growth of the length of the stems and roots?

Find the correct sets from the following.
$\begin{matrix} Type of meristematic tissue & Location & Function i. Apical meristem & Tip of stem and roots & Increase in length ii. Lateral meristem & Laterally placed inside stem and root & Increase in girth iii. Intercalary meristem & Base of leaves and internodes & Growth of leaves and stem \end{matrix}$

Q. Match List-I with List-II and select the correct answer.

List-I(Meristem)	List-II(structure)
a. Apical Meristem	$1$ . Cambium
b. Lateral Meristem	$2$ . Internodes
c. Intercalary Meristem	$3$ . Root apex
d. Secondary Meristem	$4$ . Cork cambium

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