Find the odd one (inflorescence axis elongation).

Umbel

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Spike

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Raceme

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Catkin

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Solution

The correct option is C Umbel
There are two types of inflorescence, namely racemose and cymose. In racemose, the youngest flower is present near the apex and older flower is present towards the base. Racemose inflorescence is of 3 types with respect to axis elongation. These are elongated main axis, shortened main axis and flattened main axis. Examples of inflorescence in which axis is elongated include raceme, spike, catkin, spadix. Examples of inflorescence in which axis is shortened include corymb, umbel. Examples of inflorescence in which axis is flattened include capitulum.
Thus, the correct answer is 'Umbel.'

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