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B
Wind
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C
Water
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D
Animals
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Solution
The correct option is B Mechanical means In Asteraceae, the fruit is cypsela which is a dry single-seeded fruit formed from a double ovary of which the only one develops into a seed. In cypsela, the pericarp is free from the testa. It develops from an inferior bicarpellary ovary. The fruit dispersal in Asteraceae occurs by mechanical means.