NEET 2018 · BiologyRoot layersPrevious Year Question
Casparian strips occur in
Answer: (D) Endodermis. Answer: (D) Endodermis.
- A.Cortex
- B.Pericycle
- C.Epidermis
- D.Endodermis✓
Correct Answer
(D) Endodermis
Solution & Explanation
Answer: (D) Endodermis. Solution: The innermost layer of the cortex of the root is the endodermis, a single layer of barrel-shaped cells whose tangential and radial walls bear a deposition of the water-impermeable, waxy substance suberin in the form of Casparian strips. These strips block the apoplastic pathway and force water and minerals through the cell membrane (symplast). The cortex, pericycle and epidermis lack Casparian strips. NCERT Reference: NCERT Class XI, Ch 6 Anatomy of Flowering Plants, p.74, line ~10: "...waxy material suberin in the form of casparian strips." (deposited in the endodermal cell walls).
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