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Question

Is Sunflower a flower? 


Solution

Sunflower is not a flower rather a bunch of flowers. In fact, what appears to be a single flower is in fact a group or bunch of very small flowers called an inflorescence. These flowers are aestived on a receptacle in a special arrangement. This type of inflorescence is called capitulum. Following are the key features of capitulum. 
$$*$$ Receptacle is flattened. 
$$*$$ Many small and sessile florets are present on the receptacle. 
$$*$$ The youngest florets are at the centre while the oldest are at the periphery. 
$$*$$ There are two kinds of florets in sunflower, viz. ray florets and disc florets. 
$$*$$ Ray florets are on the rim of the receptacle. These are of yellow colour. 
$$*$$ Disc florets are in the centre. They are bisexual and actinomorphic. The above features show that sunflower is not a flower but an inflorescence. 

Biology

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