Important Questions Test: Transportation in Animals & Plants - Class 7 MCQ

Blood is the main circulatory fluid in our body, responsible for transporting oxygen, nutrients, hormones, and waste products to and from the cells throughout the body. It is composed of plasma (the liquid part), red blood cells, white blood cells, and platelets. Blood circulates through the heart, arteries, veins, and capillaries, playing a crucial role in maintaining homeostasis and supporting life.

The kidneys are two bean-shaped organs in the renal system. They help the body pass waste as urine. They also help filter blood before sending it back to the heart.

Blood gets its red color from a special thing called haemoglobin. Haemoglobin helps carry oxygen to all parts of our body. This is why blood looks red, and it's very important for our body to work well.

• True! Animals need to transport oxygen to different parts of their body for survival and also need to transport waste to where it can be removed.
• Just like how we need to breathe in oxygen and take out waste from our body, animals have their ways to do the same thing.

The vessel that carries carbon dioxide-rich blood from the heart to the lungs is called the pulmonary artery. This special artery helps in taking the blood containing carbon dioxide back to the lungs for cleaning. 

A doctor uses a stethoscope to listen to the sound of your heart. It helps the doctor understand how your heart is working by listening to the thumping sounds it makes.

When plants release water through transpiration, it helps to cool the plant by evaporating water from the leaves, similar to how sweating cools our bodies.

The kidneys play a crucial role in the urinary system by filtering blood to remove waste products and excess substances, which are then excreted as urine. This process helps maintain the body's fluid and electrolyte balance, regulate blood pressure, and contribute to overall homeostasis.