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The development of a leaf primordium into a mature leaf blade involves initial growth through the apical meristem, followed by expansion via marginal meristems.

1. Growth through apical meristem only
2. Growth through marginal meristem only
3. Growth through both apical and marginal meristems
4. Growth without the involvement of any meristem

Correct answer: Growth through both apical and marginal meristems

Solution

The growth of a leaf primordium into a mature leaf involves the activity of the apical meristem initially, followed by the marginal meristems for lateral expansion.

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