Question

A food chain starts with

• A. Nitrogen fixation organisms
• B. Photosynthesising organisms
• C. Respiration
• D. Decomposers

Answer 1

The correct option is B Photosynthesising organisms

A food chain starts with the primary energy source, usually the sun or boiling-hot deep sea vents. The next link in the chain is an organism, that make its own food from the primary energy source - an example is photosynthetic plants, that make their own food from sunlight (using photosynthesis) and chemosynthetic bacteria, that make their food energy from chemicals in hydrothermal vents. These are called as autotrophs or primary producers

So, the correct answer is 'Photosynthesising organisms'