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Organisation of stem apex into corpus and tunica is determined mainly by

1. planes of cell division
2. regions of meristematic activity
3. rate of cell growth
4. rate of shoot tip growth

Correct answer: planes of cell division

Solution

The corpus-tunica organization is based on the orientation of cell divisions in the shoot apical meristem. Tunica layers divide mainly anticlinally, while the corpus divides in multiple planes, so the key factor is the planes of cell division.

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