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  4. In Pinus, the wings of the seed develops from

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Q. In Pinus, the wings of the seed develops from

AIPMTAIPMT 1994Plant Kingdom

Solution:

Mature ovule with embryo constitutes seed. The seed is covered with hard seed coat. The outer layer of the seed coat is testa (from middle stony layer). Testa encloses a brown, thin membranous fegmen (from inner fleshy layer). The tegmen survounds fleshy endosperm. Inside endosperm is present the embryo. At maturity of seed, a thin layer of ovuliferous scale fuses with testa to form a wing (i.e., seeds are winged) which helps in the dispersal of seed.