Select the option that can be used as a one-word substitute for the underlined group of words.

My mother gifted me a book on the study of plants.

Correct option is B

The correct one-word for the given group of words is botany.

Botany is the scientific study of plants including their structure, properties, and biochemical processes. (पेड़-पौधों का अध्ययन)
Example: She pursued botany in college to learn more about medicinal plants.

Meanings of the given other options:
· (a) Zoology: Study of animals (जानवरों का अध्ययन)
· (c) Geology: Study of the Earth, rocks, and minerals (पृथ्वी विज्ञान)
· (d) Physics: Study of matter, energy, and physical laws (भौतिकी)