Define phyllotaxy. Explain with suitable examples the different types

1.	Define phyllotaxy. Explain with suitable examples the different types of phyllotaxy.
Answer» The pattern of arrangement of leaves on the stem or branch are called Phyllotaxy. Phyllotaxy is of three types : (i) Alternate: In alternate phyllotaxy, a single leaf arises at each node in alternate manner, as in China rose, mustard and sunflower plants. (ii) Opposite: In opposite type of phyllotaxy, a pair of leaves arise at each node and lie opposite to each other as in Calotropis and guava plants. It is two types: (i) Opposite Superposed: e.g., Quisqualis. (ii) Opposite Decussate: e.g., Calotropis. (iii) Whorled: If more than two leaves arise at each node and form a whorl, it is called as whorled, as in Alstonia.

Define phyllotaxy. Explain with suitable examples the different types of phyllotaxy.

Answer»

The pattern of arrangement of leaves on the stem or branch are called Phyllotaxy.

Phyllotaxy is of three types :

(i) Alternate: In alternate phyllotaxy, a single leaf arises at each node in alternate manner, as in China rose, mustard and sunflower plants.

(ii) Opposite: In opposite type of phyllotaxy, a pair of leaves arise at each node and lie opposite to each other as in Calotropis and guava plants.

It is two types: (i) Opposite Superposed: e.g., Quisqualis.

(ii) Opposite Decussate: e.g., Calotropis.

(iii) Whorled: If more than two leaves arise at each node and form a whorl, it is called as whorled, as in Alstonia.

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