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Winged pollen grains are present in Pinus. Each pollen grain has two wing-like structures which enables it to float in air, as an adaptation for dispersal by the wind.

1. Winged pollen grains are absent in Pinus.
2. Winged pollen grains are present in Cycas.
3. Winged pollen grains are present in Pinus.
4. Winged pollen grains are present in Gnetum.

Correct answer: Winged pollen grains are present in Pinus.

Solution

Pinus pollen grains have two wing-like air sacs that aid wind dispersal, a classic adaptation in this genus. This feature is characteristic of Pinus among the given options.

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