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A leaf primordium grows into the adult leaf lamina by means of

1. apical meristem
2. lateral meristem
3. marginal meristems
4. at first by apical meristem and later largely by marginal meristems

Correct answer: at first by apical meristem and later largely by marginal meristems

Solution

A leaf primordium first elongates through apical growth, establishing the initial leaf axis. As the lamina develops, marginal meristems contribute most of the blade expansion, so the adult leaf is formed by both stages.

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