Biology consists of two parts namely Botany & Zoology. The Important topics of Botany are stated below:

Diversity in the Living World
Structural Organisation in Plants-Morphology
Reproduction in Plants

Plant Systematic
Cell Structure, and Function, Internal
The organization of Plants,
Plant Ecology
Plant Physiology
Microbiology
Genetics
Molecular Biology
Biotechnology
Plants
Microbes and Human Welfare

The Important topics of Zoology are stated below:

Structural Organisation in Animals
Animal Diversity
Locomotion and Reproduction in Protozoa
Biology and Human Welfare
Type Study of Periplaneta Americana

Ecology & Environment,
Human Anatomy and Physiology
Human Organic Evolution

I hope this helps. Wish you a great eve!