Biology Chapter 21: Plant Response, Growth, and Disease

Vocabulary	Objectives
21:1  Plant Response	page 440
short-day plant long-day plant day-neutral plant tropism phototropism gravitropism thigmotropism	Explain how hormones affect plant growth. Compare the flowering times of short-day, long-day, and day-neutral plants. Distinguish among tropisms and other plant movement.
21:2 Growth Requirements	page 447
annual biennial perennial fertilizer	Compare annual, biennial, and perennial plants. List the growth requirements of plants.
21:3  Plant Diseases and Pests	page 452
(no new words)	Explain how bacteria and viruses affect plants. Describe how a fungus can kill a plant. Relate two ways that insects damage plants.