The technique of communication by signs made with the fingers is called

Answer: Option A

Explanation:

The study of effect of environment on workers is called Ergonomy.

The science of improving a human population by controlled breeding to increase the occurrence of desirable heritable characteristics is called Eugenics.

The study of heredity and the variation of inherited characteristics is called Genetics.

Answer: Option A

Explanation:

The study of sound is called Acoustics.
The science or art of flight is called Aeronautics.
The philosophy of fine arts Aesthetics.
The science of soil management is called Agronomy.

Answer: Option A

Explanation:

The scientific study of birds is called Ornithology.

The correct or accepted pronunciation of words is called Orthoepy.

The method and practice of teaching, esp. as an academic subject or theoretical concept is called Pedagogy.

Answer: Option B

Explanation:

The science dealing with the structure of animals, plants or human body is called Anatomy.

The study of history of a list of books on a subject is called Bibliography.

The science that deals with the origin, physical and cultural development of mankind is called Anthropology.

Answer: Option C

Explanation:

The study of human races is called Ethnology.

The study of animal behaviour is called Ethology.

The study of origin and history of words is called Etymology.