Question

Passage cell occur in
A. Monocot root
B. Dicot root
C. Monocot stem
D. Aerial root

Answer 1

Hint: Passage cells are found in the endodermis of vascular plants, these cells are present opposite to the protoxylem strands also called as transfusion cells. These cells provide a low resistance area for water movement.

Complete answer:
Passage cells occur in the form of short cells. Endodermal cells without the casparian strips are known as passage cells. These cells are found in the dicot and monocot root. This question has multiple correct options.

> Option A - Monocot root: Passage cells are found in the endodermis of a root, found opposite to the protoxylem element. These are unthickened that helps in the transverse action of fluids through it.

> Option B - Dicot root: The passage cells are found in the endodermis of dicot roots. Innermost layer of the plant cortex is called endodermis. These passage cells allow passage between vascular tissue and the cortex.

> Option C - Monocot stem: Passage cells are present in monocot root not the monocot stem so this is not the correct option.

> Option D - Aerial root: These are roots that are above the ground like mangroves, banyan figs etc. Passage cells are not present in the aerial roots.

Hence, the correct answer is option A and B.

Note: Passage cells occur in endodermis and exodermis but these are not ubiquitous in any of the layers. Passage cells of endodermis and exodermis play essential roles in the plant root system. These cells provide an area of low resistance for passage and help in the passage of other substances also.