Since you have not mentioned any board I am going with CBSE  which is prominent in many states.

Class 11 botany syllabus (CBSE)

1. Diversity in living world : The living world, Biological classification, plant kingdom animal kingdom.

2. Structural organization in plants and animals: Morphology of flowering and plants, Anatomy of flowering plants, Structural organization in animals.

3. Cell: structure and functions: Cell :the unit of life, Biomolecules, Cell cycle and cell division

4. Plant physiology: Photosynthesis in higher plants, Respiration in plants, Plant growth and development.

5. Human physiology

Class 12 botany syllabus (CBSE)

1. Reproduction: Reproduction in organisms, Sexual reproduction in flowering plants,Human reproduction, Reproductive health

2. Genetics and evolution: Principles of inheritance and variations, Molecular basis of inheritance, Evolution

3.Biology and human welfare:Human health and disease, Strategies for enhancement in food production, Microbes in human welfare

4. Biotechnology and its applications: Biotechnology principles and process, Biotechnology and its applications.

5. Ecology and environment: Organisms and population, Biodiversity and conservation, Ecosystem, Environmental issues.

Hello aspirant,
The Botany syllabus For classes 11 and 12 overs a range of topics related to plant biology. The exact syllabus might vary slightly depending on the educational board (like CBSE, ISC, etc.)

For class 11
1. Diversity in Living World
2. Plant Physiology
3. Structural Organization in Animals and Plants

For class 12:
1. Reproduction in Organisms
2. Genetics and Evolution
3. Biology and Human Welfare
4. Ecology and Environment

I hope this information is helpful to you.

Please mention your board name to know the syllabus of botany mostly the basic botany syllabus contains plants related studies like Pteridophytes, Gymnosperms, along with Angiosperms.Algae and Microbiology, Biomolecules and Cell Biolog.in case you are from want neet botany syllabus refer this link

https://medicine.careers360.com/articles/neet-botany-syllabus