AP BIOLOGY

Detailed explanation-1: -Annuals take a single year to complete a full life cycle. Most are planted in the spring, bloom in the summer, and die in the fall. A few, known as winter annuals, germinate in the later summer and autumn, are dormant during the winter, and grow during the next spring and summer.

Detailed explanation-2: -An annual, such as a zinnia, completes its life cycle in one year. Annuals are said to go from seed to seed in one year or growing season. During this period, they grow, mature, bloom, produce seeds and die.

Detailed explanation-3: -Definition. Annual plants complete their life cycle in one growing season. Biennial plants are planted in one year, grow through the year, grow on and flower during the next year. Perennial plants grow strong year after year. Examples.

Detailed explanation-4: -Biennials. The life cycle of biennial plants is completed over two growing seasons. During the first season, they produce only leaves-usually in a rosette. Following a winter cold period, they flower in the second growing season, produce seeds, and then die.

Detailed explanation-5: -Phenology and growth cycle Seasonal growth is driven by day length and temperature, and alternates with winter dormancy. The transition from dormancy to active growth in spring is marked by bleeding of xylem sap from pruning wounds due to root pressure.