Question

If more than one leaf is borne on same node arranged in a whorl, then the phyllotaxy is said to be___________.

• A. Opposite
• B. Alternate
• C. Whorled
• D. None of the above

Answer 1

Leaves arise from the node of the stem. They develop from the shoot apical meristems. Leaves have axillary buds that develop into branches. Phyllotaxy is the term used to describe the arrangement of leaves around the stem. The proper arrangement of leaves is important for providing sunlight and photosynthesis.

The three main types of leaf arrangement are:

1. Alternate – In this type of phyllotaxy, a single leaf originates at each node and leaves are arranged in an alternate fashion. E.g. mustard, china rose, sunflower, etc.
2. Opposite – In this type of arrangement, two leaves arise at each node and they lie opposite each other. E.g. guava, Calotropis, etc.
3. Whorled – In this type of phyllotaxy, more than two leaves arise at each node and form a whorl. This type of arrangement is found in Alstonia.

So, the correct answer is option D. Whorled