EVERYDAY SCIENCE

Detailed explanation-1: -Animals take in oxygen through the lungs by internal and cellular respiration. It takes place inside the animal body and releases carbon dioxide. Plants photosynthesize their glucose. Animals obtain their glucose by the breakdown of carbohydrate molecules.

Detailed explanation-2: -Plants form glucose by photosynthesis and animals get glucose by breaking down the food they eat. During cellular respiration, glucose combines with oxygen to release energy and to form carbon dioxide and water.

Detailed explanation-3: -Animals depend on plants for food and oxygen. As heterotrophic organisms, animals are unable to manufacture their own food. Glucose is essential in the synthesis of energy-rich adenosine triphosphate (ATP) molecules.

Detailed explanation-4: -As with photosynthesis, plants get oxygen from the air through the stomata. Respiration takes place in the mitochondria of the cell in the presence of oxygen, which is called “aerobic respiration".

Detailed explanation-5: -Cellular respiration is the process by which cells in plants and animals break down sugar and turn it into energy, which is then used to perform work at the cellular level. The purpose of cellular respiration is simple: it provides cells with the energy they need to function.