_______ is an autotrophic mode of nutrition.

Explanation

This Biology question is asking for an example of an autotrophic mode of nutrition. Autotrophic nutrition refers to the process by which organisms make their own food using energy from sunlight or inorganic compounds. The options given are chemosynthesis, saprophytism, parasitism, and symbiosis. Chemosynthesis is the correct answer because it is an autotrophic mode of nutrition in which energy from inorganic compounds is used to produce organic compounds. This process is commonly found in bacteria and other microorganisms that live in extreme environments such as deep-sea hydrothermal vents. Saprophytism, parasitism, and symbiosis are not examples of autotrophic nutrition. Saprophytism is a type of heterotrophic nutrition in which organisms obtain nutrients by decomposing dead organic matter. Parasitism is a type of heterotrophic nutrition in which organisms obtain nutrients from a host organism, often causing harm to the host. Symbiosis refers to a close and long-term interaction between two different species, and can involve both autotrophic and heterotrophic nutrition. Understanding different types of nutrition is important in Biology as it helps us understand how different organisms obtain energy and nutrients to survive.