NEET BIOLOGY

Detailed explanation-1: -Gymnosperms were the first seed plants to have evolved. The earliest seedlike bodies are found in rocks of the Upper Devonian Series (about 382.7 million to 358.9 million years ago). During the course of the evolution of the seed habit, a number of morphological modifications were necessary.

Detailed explanation-2: -Gymnosperms, the earliest seed plants, also first appeared in the fossil record during the Devonian. Seedless vascular plants had previously colonized land, and the wet Devonian climate allowed the seedless plants to proliferate quickly.

Detailed explanation-3: -The Ginkgoales, a group of gymnosperms with only one surviving species, the Gingko biloba, were the first gymnosperms to appear during the lower Jurassic. Gymnosperms expanded in the Mesozoic era (about 240 million years ago), supplanting ferns in the landscape, and reaching their greatest diversity during this time.

Detailed explanation-4: -Fossil record and experimental evidence strongly suggests that liverworts are among the first plants that colonized terrestrial environments, and they have thus been considered as living laboratories in which to evaluate morphological adaptation associated with the transition to life on land 1, 4, 6, 7, 8.

Detailed explanation-5: -The gymnosperms originated about 319 million years ago, in the late Carboniferous. It is a diverse cluster of plants, containing cycads, ginkgos and the shrub Mormon tea.