Histology- It is the branch of biology concerned with the microscopic study of composition and structure of tissues in relation to their specific functions.
Ecology-Ecology is the branch of biology that deals with the inter-relationship amongst organisms and interactions between organisms and their environment. Term ecology was given by Ernst Haeckel.
Cytology-Cytology is a branch of biology that concerned with the study of structure and function of cells. Now it is replaced by cell biology.
Pathology-Pathology is the branch of biology that deals with the study of diseases of plants and animals and their effects and causes.