GENERAL HISTOLOGY

Detailed explanation-1: -Some organisms, such as plants, capture the sun’s energy and then convert it into chemical energy for food. This process is called photosynthesis. Others use chemical energy present in their food molecules. This is called cellular respiration.

Detailed explanation-2: -Metabolism. Metabolism means taking in and using energy. All organisms (such as the California condor shown in Figure 6) use a source of energy for their metabolic activities. Some organisms capture energy from the Sun and convert it into chemical energy in food; others use chemical energy from molecules they take in.

Detailed explanation-3: -Living things take in oxygen and oxidise the food with the release of energy by the process of cellular respiration. The energy released by the respiration is used for the growth and development of the body. It helps to perform several functions like digestion, respiration etc.

Detailed explanation-4: -The process is carried out by plants, algae, and some types of bacteria, which capture energy from sunlight to produce oxygen (O2) and chemical energy stored in glucose (a sugar).

Detailed explanation-5: -Through photosynthesis, certain organisms convert solar energy (sunlight) into chemical energy, which is then used to build carbohydrate molecules. The energy used to hold these molecules together is released when an organism breaks down food. Cells then use this energy to perform work, such as cellular respiration.