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Question:

Which of the following is true?

Umbel is a racemose inflorescence where all stalked flower aggregate on the flat receptacle.

Raceme is a racemose inflorescence having main axis shortened flower born acropetally.

Spadix is a racemose inflorescence having pendulous spike with main axis much flattened.

Spike is a racemose inflorescence having sessile flowers.

Solution:

The correct option is D. Spike is a racemose inflorescence having sessile flowers. Spike is a racemose inflorescence that bears sessile flowers in an acropetal fashion e.g., chaff flower (Achyranthes), bottle brush (Callistemon), Adhatoda vasica, Amaranthus.