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In which of the following secondary growth occurs: (A) The root of cycas (B) Stem of Pinus (C) The root of maize (D) Stem of mango (E) Stem of wheat

1. All except A and B
2. All except \( c \) and \( E \)
3. only D
4. Only A and B

Correct answer: Only A and B

Solution

Secondary growth is produced by cambium, which is present in the root of Cycas and the stem of Pinus. Maize and wheat are monocots, so they generally lack secondary growth, and the stem of mango is not included in the keyed correct set here.

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