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  4. Winged pollen grains are found in :

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Q. Winged pollen grains are found in :

BHUBHU 2003

Solution:

Winged pollen grains are found in Pinus. Mature microspore or pollen grain has twro wall layers-the outer thick exine and inner thin intine. The outer exine is expanded on the sides to form ballon like wings. These wings help in transportation of pollen grain from one place to another place.
Microspore or pollen grain of Cycas is non-winged structure.
Pollen grains are absent in Pteris and Selaginella.