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During secondary growth, the interfascicular cambium develops from the parenchyma of medullary rays. Together with the intrafascicular cambium (originating from cambium cells located between xylem and phloem), they form a continuous cambium ring. This ring produces new cells in both directions, contributing to secondary growth in most dicot plants. What is the source of interfascicular cambium?

1. a) It arises exclusively from xylem tissue.
2. b) It arises exclusively from phloem tissue.
3. c) It arises from both xylem and phloem tissues.
4. d) It arises from the parenchyma of medullary rays.

Correct answer: d) It arises from the parenchyma of medullary rays.

Solution

The interfascicular cambium is formed by the dedifferentiation of parenchymatous medullary rays, which, along with the intrafascicular cambium, forms a continuous cambium ring responsible for secondary growth in dicotyledonous plants.

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