Phytotron is a facility to

Correct Option (c)

A phytotron is an enclosed research facility designed to cultivate plants under precisely controlled environmental parameters. These parameters include temperature, humidity, light intensity, photoperiod (duration of light exposure), and atmospheric composition (e.g., CO₂ levels). This controlled environment enables scientists to conduct experiments on plant growth and development, physiological responses to environmental stressors, and genetic studies by isolating specific variables.

Incorrect Options:

Options (a), (b), and (d) describe specific applications or outcomes that might be facilitated within a phytotron, but they do not define the fundamental nature or primary purpose of the facility itself. A phytotron is a tool for creating controlled conditions, which can then be utilized for various research objectives, including:

• Growing plants under disease-free conditions (a) by maintaining sterile environments.
• Conserving endangered species of plants (b) by providing optimal growth conditions for propagation.
• Inducing mutations (d) by exposing plants to specific mutagens within a controlled setting.

However, the core definition of a phytotron is its capacity to grow plants under controlled conditions, making (c) the most accurate and comprehensive description.