AP BIOLOGY

Detailed explanation-1: -The plant world is conveniently separated into two major groups: nonvascular plants and vascular plants. The nonvascular plants include the bryophytes, while the vascular plants include the ferns, gymnosperms, and angiosperms (see Chapter 19).

Detailed explanation-2: -Nonvascular plants (often referred to collectively as the bryophytes) include three groups: the mosses (Bryophyta), approximately 15, 000 species; liverworts (Hepaticophyta), approximately 7500 species; and hornworts (Anthocerophyta), approximately 250 species (Table 1).

Detailed explanation-3: -Explanations of Classifications (beginning with “Class") Class divides plants into the two large groups, Dicots and Monocots.

Detailed explanation-4: -The two primary vascular tissues are xylem, which transports water and dissolved minerals from the roots to the leaves, and phloem, which conducts food from the leaves to all parts of the plant.

Detailed explanation-5: -Both vascular and nonvascular plants have chloroplasts in their cells. This means that the plants have the ability to conduct photosynthesis and produce food by using carbon dioxide and the sun.