Question

Select the correct pattern of arrangement of reproductive structures for gymnosperms.
A) Spores- Sporophylls- Sporangia-Strobill
B) Spores- Sporangia-Sporophylls-Strobili
C) Sporangia- Sporophylls-Spores-Strobili
D) Spores-Sporangia-Strobilus-Sporophylls

Answer 1

The cones are unisexual, namely the male cones constitute microsporangiate (pollen cones) while megasporangiate (seed cones) constitute the female cones.

Complete answer:
First we should know about gymnosperms to answer this question. Gymnosperms are a category of plants that produce seeds inside an ovary or fruit that are not enclosed. The seeds are exposed to the breeze and pollination directly fertilises them. On the layer of scales and leaves, which also grow to create cone or stalk forms, gymnosperms cultivate their seeds, contrasted with the features of angiosperms, flowering plants that enclose their seeds inside an ovary.
Now, let us find the solution from the options-
- Gymnosperms seem to be heterosporous, which means that the male (microspores) as well as the female (megaspores) produce two different types of spores.
-Inside the sporangia, the spores are carried.
-Particular leaf-like shapes called microsporophylls (stamens) as well as megasporophylls (carpels) are raised on the two kinds of sporangia (microsporangia as well as megasporangia).
- In the shape of dense structures known cones and strobili, the sporophylls are generally aggregated.

Thus, the correct option is option (B) Spores- Sporangia-Sporophylls-Strobili.

Note: The non-encased state of gymnosperm seeds compares with the flowering plant seeds or ovules (angiosperms) that are sealed within the ovary. On the layer of scales and leaves, gymnosperm seeds grow, which are also modified to create cones.