Both gymnosperms and angiosperms bear seeds, then why are they classified separately?
Both gymnosperms and angiosperms bear seeds, then why are they classified separately?
Gymnospermsand angiosperms are seed-producing plants with diplontic life cycles.
Ingymnosperms, the sporophylls are aggregatedto form compact cones. The microsporophylls are broad and are notdistinguished into filaments and anthers. The megasporophylls arewoody and lack the ovary, style, and stigma, because of which theovules lie exposed. The female gametophyte consists of archegonia.The fertilisation process involves the fusion of a male gamete withthe female gamete. Their endosperm is haploid. The produced seeds arenaked as there is no fruit formation.
Angiospermsare also known as flowering plants. They have sporophylls thataggregate to form flowers with the perianth. The microsporophyllsconsist of stamens containing pollen sacs. These sacs bear the malegametes called pollen grains. The megasporophylls are delicate androlled, forming carpels that contain the ovary, style, and stigma.The ovules are present inside the ovary. The archegonium is replacedby an egg apparatus. Two male gametes enter the egg apparatus at thetime of fertilisation. One male gamete fertilises the egg and theother fuses with the diploid secondary nucleus to form an endosperm.The resulting endosperm is thus triploid. In addition, inangiosperms, the development of seeds takes place inside the fruits.
Gymnospermsand angiosperms are seed-producing plants with diplontic life cycles.
Ingymnosperms, the sporophylls are aggregatedto form compact cones. The microsporophylls are broad and are notdistinguished into filaments and anthers. The megasporophylls arewoody and lack the ovary, style, and stigma, because of which theovules lie exposed. The female gametophyte consists of archegonia.The fertilisation process involves the fusion of a male gamete withthe female gamete. Their endosperm is haploid. The produced seeds arenaked as there is no fruit formation.
Angiospermsare also known as flowering plants. They have sporophylls thataggregate to form flowers with the perianth. The microsporophyllsconsist of stamens containing pollen sacs. These sacs bear the malegametes called pollen grains. The megasporophylls are delicate androlled, forming carpels that contain the ovary, style, and stigma.The ovules are present inside the ovary. The archegonium is replacedby an egg apparatus. Two male gametes enter the egg apparatus at thetime of fertilisation. One male gamete fertilises the egg and theother fuses with the diploid secondary nucleus to form an endosperm.The resulting endosperm is thus triploid. In addition, inangiosperms, the development of seeds takes place inside the fruits.
