Gymnosperms

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Gymnosperms are distinguished from angiosperms by a feature of their reproductive biology in which the ovules display which particular condition?

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The defining reproductive trait of gymnosperms, given in NCERT Class 11, Chapter 3 (Plant Kingdom), is that the ovules are not enclosed by any ovary wall and remain exposed both before and after fertilisation, so the seeds that develop from them are likewise naked. The very name gymnosperm means naked seed. Hence the correct condition is that the ovules remain naked and uncovered by an ovary. The option stating ovules are enclosed in a ripened ovary describes angiosperms, where the ovary matures into a fruit enclosing the seeds, which is the opposite of gymnosperm biology. The claim that ovules develop only after double fertilisation is incorrect, because double fertilisation leading to a triploid endosperm is a hallmark of angiosperms, not gymnosperms. Fusion of ovules into a syncarpous pistil again refers to a closed carpel arrangement found only in flowering plants. Pinus, Cycas, Ginkgo and Cedrus are familiar gymnosperms, often bearing their ovules on the surface of cone scales. A consistency check confirms the answer: if the seeds of gymnosperms are described as naked, then logically the ovules giving rise to them must also have been exposed, lacking any enclosing ovary wall.

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