Identify the incorrect statement regarding gymnosperms.

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All gymnosperms are heterosporous.

All gymnosperms have vascular tissues.

All gymnosperms have male and female cones on the same plant.

In all gymnosperms diploid sporophytic stage is dominant.

answer is C.

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Detailed Solution

No, not all gymnosperms have male and female cones on the same plant. In gymnosperms, the reproductive structures are typically borne on separate male and female cones, but they may be found on the same plant (monoecious) or on different plants (dioecious), depending on the species.

For example, in some conifers like pines, male cones and female cones are usually found on the same tree but are located on different branches. This arrangement is referred to as monoecious. However, in other gymnosperms like some species of junipers or cycads, male and female cones are found on separate plants, making them dioecious.

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