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Why do internodal segments of sugarcane ...

Why do internodal segments of sugarcane fail to propagate vegetatively even when they are in contact with damp soil ?

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The site of origin of plantlets is node which when come in contact with damp soil, produce roots and new plants. New plants do not arise from the internodes or internodal segments of sugarcane
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TRUEMAN BIOLOGY-REPRODUCTION-SECTION-D
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