Explanation

The scientific study of different aspects of plants is called botany

plant biology or phytology, is the science of plant life and a branch of biology.

Additional information:

study of soil is called  pedology

study of grasses is called agrostology

study of food is called bromatology

study of cells is called cytology

study of animals is called zoology

study of skin is called dermatology

study of insects is called entomology

study of eggs is called oology

study of earthquakes is called seismology

study of viruses is called virology

study of bacteria is called bacteriology

study of the heart is called cardiology 

study of fermentation is called zymology