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Question

The pattern of arrangement of leaves on a stem is called .


A
venation
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B
whorls
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C
phyllotaxy
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D
placentation
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Solution

The correct option is C phyllotaxy
Phyllotaxy is the pattern of arrangement of leaves on the stem. It is of three types.
  1. Alternate: A single leaf arise at each node. E.g. China rose, sunflower, etc.
  2. Opposite: A pair of leaves arise at each node, opposite to each other. E.g. Calotropis, guava, etc.
  3. Whorled: More than two leaves arise at a node and forms a whorl. E.g. Alstonia, aloevera, etc.

Biology

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