The colourful part of the Sunflower or Marigold plant is

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Flower

Inflorescence

Fruit

Seed

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This question was previously asked in

UPSC NDA-1 – 2017

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The colourful part of the Sunflower or Marigold plant is an inflorescence.

Plants like Sunflower (Helianthus annuus) and Marigold (Tagetes spp.) belong to the family Asteraceae (also known as Compositae). Their characteristic flower structure is a capitulum or head, which is a type of inflorescence. What appears to be a single flower is actually a composite structure made up of many smaller individual flowers called florets. The outer, colourful “petals” are typically ray florets, while the central part consists of numerous disc florets.

A single flower is a reproductive structure. An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or complicated arrangement of branches. Fruits develop from flowers (or inflorescences in some cases), and seeds are contained within the fruit, developing from ovules.

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