What are evergreen plants and deciduous plants? Why do leaves drop off seasonally? [3 MARKS]

Each point: 1 Mark

1. Evergreen plants are plants that have leaves throughout the year, always green.
2. Deciduous plants are plants which completely lose their leaves during the winter or dry season.
3. The leaves drop off seasonally as they stop producing auxins, which normally prevents the formation of abscission zone that cuts off nutrients and water supply to leaves. Leaves also produce abscisic acid which promotes wilting and falling of leaves.