Life Processes in Animals - Class 7 Science Free MCQ Test with solutions

The diaphragm is a muscle that moves up and down when you breathe. When it contracts (moves down), it lets air into the lungs. When it relaxes (moves up), it helps push the air out of the lungs.

The circulatory system moves important substances like oxygen and nutrients throughout the body. It includes the heart and blood vessels, which help keep the body functioning properly.

Fish use gills to take oxygen from water. Gills are special organs that let fish breathe underwater, unlike land animals that use lungs.

Gas exchange happens in the alveoli, which are tiny sacs in the lungs. They help oxygen enter the blood and remove carbon dioxide.

Respiration is a process inside cells where food is broken down to produce energy, while breathing is just the movement of air in and out of the lungs.

Saliva contains enzymes that start breaking down carbohydrates (like starch) into simpler sugars when you chew.

The alimentary canal is a tube that helps break down food and absorb the nutrients the body needs.

The large intestine absorbs water from undigested food to prevent dehydration and form solid waste.

Rumination is when animals like cows bring up food they’ve already eaten to chew it again. This helps break down tough plant food.

The small intestine is where most of the food is absorbed into the blood to give the body energy and nutrients.

Peristalsis is the muscle movement that pushes food through the digestive system. It happens automatically.

Ruminants like cows chew their food twice. First, they swallow it, then bring it back up to chew it more to break it down properly.