The term Phyllotaxy refers to the pattern of :

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arrangement of leaves.

branching in stem.

flower formation on branch.

arrangement of flowers.

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UPSC CDS-2 – 2023

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Phyllotaxy is a botanical term that refers specifically to the pattern of arrangement of leaves on the stem of a plant. These patterns are often species-specific and can follow mathematical sequences like the Fibonacci sequence.

Common phyllotaxy patterns include alternate (one leaf per node, alternating sides), opposite (two leaves per node on opposite sides), and whorled (three or more leaves per node).

Branching in stem (option B) refers to the architecture of the stem system. Flower formation on a branch (option C) and arrangement of flowers (option D) relate to the inflorescence, which is the arrangement of flowers on a plant. Phyllotaxy is distinct from these terms.

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