Q.

Casparian strips are present in

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a

stem endodermis

b

root endodermis

c

stem pericycle

d

soot pericycle

answer is B.

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Detailed Solution

Explanation:

Casparian strips are specialized bands made of suberin and lignin located in the cell walls of the endodermal cells in roots. They regulate the movement of water and dissolved substances by forcing them through the cell membrane rather than the cell wall, ensuring selective absorption and preventing backflow. This structure is absent in stems and pericycles.

Final Answer

Casparian strips are present in the root endodermis.

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