DENDROLOGY

Detailed explanation-1: -Most autotrophs use a process called photosynthesis to make their food. In photosynthesis, autotrophs use energy from the sun to convert water from the soil and carbon dioxide from the air into a nutrient called glucose. Glucose is a type of sugar. The glucose gives plants energy.

Detailed explanation-2: -Autotrophs depend on photosynthesis to get the energy(ATP & NADPH) by converting light energy from the sun into chemical energy in the form of organic compounds, which they need to survive. Heterotrophs can only obtain that energy by consuming an autotroph; which depends on photosynthesis.

Detailed explanation-3: -Photosynthesis is the process in which light energy is converted to chemical energy in the form of sugars. In a process driven by light energy, glucose molecules (or other sugars) are constructed from water and carbon dioxide, and oxygen is released as a byproduct.

Detailed explanation-4: -During the process of photosynthesis, oxygen is released into the environment, which is utilised by all living organisms. Carbon dioxide is released during respiration and not photosynthesis.