NEET BIOLOGY

Detailed explanation-1: -In gymnosperms (plants with “naked seeds”-such as conifers, cycads, and ginkgo), the ovules are not enclosed in an ovary but lie exposed on leaflike structures, the megasporophylls.

Detailed explanation-2: -Most gymnosperms produce seeds in structures called cones or strobili (singular strobilus; Figure 8.1. 2). Cones evolved from modified leaves, and they can either be male cones that produce pollen, or female cones that produce ovules.

Detailed explanation-3: -Furthermore, gymnosperms produce two different types of cones, namely, large female cones and small male cones. Four groups of gymnosperms are known: CYCADOPHYTA: 100 cycad species (cycad, sago palm) GINKGOPHYTA: 1 plant species (ginkgo)

Detailed explanation-4: -By far the largest group of living gymnosperms are the conifers (pines, cypresses, and relatives), followed by cycads, gnetophytes (Gnetum, Ephedra and Welwitschia), and Ginkgo biloba (a single living species).