Pappus helps in parachute mechanism in

Helianthus

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Colutea

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Alstonia

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Ecballium

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Solution

The correct option is A Helianthus
Pappus helps in parachute mechanism in Helianthus. In this mechanism, an individual parachute shows an umbrella-like, plumose crown of hairs (pappus) above a slender one-seeded fruit (called as an achene). These fragile units can become airborne with the slightest gust of wind, and can literally sail across valleys and over mountain slopes.
Therefore, the correct answer is option A.

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