AP BIOLOGY

Detailed explanation-1: -Plants can be divided into two groups: flowering plants, for example, sunflowers, orchids, and most types of tree. The other group is nonflowering plants, which includes mosses and ferns. All plants make their own food, taking energy from sunlight.

Detailed explanation-2: -Answers: Based on the system of classification proposed by A. W. Eichler (1875-78), the plant kingdom is divided into two subkingdoms Cryptogamae and Phanerogamae. The cryptogams are flowerless (non-flowering) and seedless, spore-bearing plants. Phanerogams are flower bearing, seed producing tracheophytes.

Detailed explanation-3: -Based on whether plants have well-differentiated body (root, stem and leaves). Presence or absence of specialized vascular tissues. Presence or absence of seeds, flowers and seeds.

Detailed explanation-4: -The two main groups of land plants are vascular plants (division Tracheophyta) and non-vascular plants (the bryophytes). Vascular plants have true leaves, stems and roots, while bryophytes are more rudimentary in their form.