How do living organisms obtain energy for their activities?
Answers
Answer:
Living organisms obtain energy from food for their activities.
Organisms like humans obtain our energy by breaking down molecules and utilizing their chemical energy. Specifically, we rely on oxidation of these molecules to obtain electrons which drive the chemical reactions in our body. Such organisms are known as chemotrophs. Chemotrophs that have to ingest organic matter (us) are called chemoheterotrophs. Chemotrophs that can make everything they need from carbon dioxide rely only on inorganic matter and are called chemoautotrophs (certain types of bacteria).Plants, on the other hand, obtain their energy by converting solar light energy into chemical energy. Light and the oxidation of water provide energy to synthesize organic molecules from carbon dioxide. These organisms are known as phototrophs.