Energy,Growth and Repair.
Animal cells don't have chloroplasts. Only plant cells do. Plant cells use chloroplasts in photosynthesis. They catch light energy that is essential for them to make food. Animals don't use photosynthesis to make food, so they can't get energy from something they don't have.
Nutrition.
Food.
Food has various nutrients such as Carbohydrates, Fats, Proteins, Minerals,Vitamins.Each Nutrient contains energy,growth and many more.So for energy and growth and also for protection against diseases we need FOOD
All Organism need Food to promote growth and for energy.
body needs food for growth, energy and repair
So that they will have energy to use for their growth and development.
Assimilation
In food, there are many macro molecules. Among them, the main contribution towards the energy is given by the carbohydrates and fats. For the development, growth and repair our cell needs proteins and other micro nutrients like vitamins and minerals.
Mitochondria uses energy from food to make high energy compounds that the cell can use to power growth, development, and movement. Chloroplasts use energy from sunlight to make energy rich food.
metabolism