The correct answer is A. Photosynthesis.
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar. This process is essential for life on Earth, as it provides the oxygen that we breathe and the food that we eat.
Respiration is the process by which organisms break down food molecules to release energy. This process occurs in all living things, from plants to animals to humans.
Recycling is the process of converting waste materials into new materials and objects. This process helps to reduce the amount of waste that is sent to landfills and incinerators.
Productivity is the rate at which goods and services are produced. This is an important economic measure, as it indicates the level of economic activity in a country.
In conclusion, the correct answer to the question “Light energy is transformed into chemical energy by” is A. Photosynthesis.