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  • The flowers in the spike are arranged Option: 1  Acropetally Option: 2 &nbsp

The flowers in the spike are arranged 

Option: 1

 Acropetally 


Option: 2

 Basipetally 


Option: 3

Centrifugally 


Option: 4

 centripetally 


Answers (1)

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Racemose Inflorescence and Its Types - Category A

Racemose Inflorescence:

  • It is also called an indeterminate or indefinite inflorescence.
  • The main axis continues to grow and never ends in a flower.
  • The flowers occur acropetally, that is, oldest flower towards the base and gradually the youngest flowers the apex.
  • The flowers can also occur centripetally, that is,  the oldest flower towards the margin and the youngest one at the center.

Category A: Main axis elongated

 Spike:

  • The main axis is elongated.
  • The flowers are sessile and are borne on the main axis direction.
  • Examples - Amaranthus, Bottlebrush, etc
  • A small spike with a few small bracteate flowers is called the spikelet.
  • Examples - Oats and grasses.
  • A compound spike is the one in which the main axis is branched and the branches bear spikes or spikelets.
  • It is called the spike of spikelets.
  • Example - Wheat

The flowers in racemose inflorescence occur acropetally, that is, oldest flower towards the base and gradually the youngest flowers the apex. Spike is a type of racemose inflorescence. 
 

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