AP BIOLOGY

Detailed explanation-1: -What are angiosperms? Angiosperms are plants that produce flowers and bear their seeds in fruits. They are the largest and most diverse group within the kingdom Plantae, with about 300, 000 species.

Detailed explanation-2: -Flowering plants are called angiosperms (angio = cov-ered, sperm = seed), plants that have seeds enclosed in a fruit that develops from an ovary. There are two classes: Magnoliopsida, the dicots (embryos with two seed leaves-dicotyledons), and Liliopsida, the mono-cots (embryos with one seed leaf-monocotyledons).

Detailed explanation-3: -Flowering plants are often classified on the basis of their flower color. Sometimes it is useful to have several layers in a classification. Woody plants could be divided into trees and shrubs. Trees could be divided into trees that lose their leaves into winter and those that do not.

Detailed explanation-4: -Final answer: The flowering plants are classified according to their size into herbs, shrubs and trees. Herbs are short-sized plant with green, tender and non-woody stems, whereas shrubs and trees are woody plants. Trees have single main stem which grows for some distance above the ground before branching.

Detailed explanation-5: -The principal purpose of a flower is the reproduction of the individual and the species. All flowering plants are heterosporous, that is, every individual plant produces two types of spores. Microspores are produced by meiosis inside anthers and megaspores are produced inside ovules that are within an ovary.