Transportation and Excretion 7 th Biology William Harvey was an English physician was the first to give the details of blood circulation, the properties of blood and the pumping of blood by the heart . Q1. Why is color of blood red? Ans. . Blood has a Pigment known as hemoglobin that gives red color to it. Q2. What does blood consist of? Ans . Blood consists of Red blood cells, white blood cells, platelets and plasma. Q3. What is removed along with water as sweat? Ans . Extra salts are removed along with water as sweat. Q4. What is the function of stethoscope? Ans . Stethoscope is used by doctors to amplify heart beat so that it can be analysed properly. Q5. What is pulse? Ans . Throbbing that occurs in arteries due to flowing of blood is called pulse. Q6. Why is transport of materials necessary in a plant or in an animal? Ans . All organisms need food, water and oxygen for survival. They need to transport all these to various ...