Introduction:
Organisms that can produce their own food are known as autotrophs. They have the ability to convert sunlight, water, and carbon dioxide into organic compounds through the process of photosynthesis.

Explanation:
Out of the given options, only plants have the ability to produce food on their own. Plants are the primary producers in the food chain and provide a source of food for other organisms. They use the energy from sunlight to convert carbon dioxide and water into glucose, which is used as a source of energy for the plant. This process is known as photosynthesis.

Examples of autotrophs:
Apart from plants, there are other autotrophs that can produce their own food. Some examples of autotrophs are:

1. Algae - They are aquatic autotrophs that use photosynthesis to produce their own food.

2. Cyanobacteria - These are a group of bacteria that can carry out photosynthesis and produce their own food.

3. Some bacteria - Some bacteria can produce their own food through chemosynthesis, where they use chemicals instead of sunlight to produce organic compounds.

Conclusion:
In conclusion, only autotrophs like plants have the ability to produce food on their own through the process of photosynthesis. Other organisms like animals, birds, and fish are heterotrophs that depend on other organisms for their food.