Imp Questions For All Chapters – General Science Class 8
Short Questions
1. What is the function of the heart?
- The heart pumps blood to all parts of the body.
2. What are the components of blood?
- Blood has plasma, red blood cells (RBCs), white blood cells (WBCs), and platelets.
3. What is the function of red blood cells (RBCs)?
- RBCs carry oxygen to the body and remove carbon dioxide.
4. What is the function of white blood cells (WBCs)?
- WBCs fight infections and protect the body from diseases.
5. What is the role of platelets in blood?
- Platelets help in blood clotting to stop bleeding.
6. What is the normal human body temperature?
- 37°C (98.6°F).
7. What is the function of the circulatory system?
- It transports oxygen, nutrients, and waste throughout the body.
8. Which organs are part of the respiratory system?
- Nose, trachea (windpipe), lungs, and diaphragm.
9. What is the function of the diaphragm?
- The diaphragm helps in breathing by moving up and down.
10. Which blood group is called the universal donor?
- O-negative blood group is the universal donor.
11. Which blood group is called the universal recipient?
- AB-positive blood group is the universal recipient.
12. What is the function of the kidneys?
- Kidneys filter waste from blood and produce urine.
13. What is the pH of oxygenated blood?
- The pH of oxygenated blood is 7.4 (slightly alkaline).
14. Which part of the body produces RBCs?
- RBCs are produced in the red bone marrow.
15. What is hypertension?
- Hypertension is high blood pressure.
16. Why should salt intake be limited?
- Too much salt can cause high blood pressure and heart disease.
17. What is the main function of the lungs?
- The lungs help in breathing and gas exchange.
18. Which gas do we inhale and exhale?
- We inhale oxygen (O₂) and exhale carbon dioxide (CO₂).
19. What is respiration?
- Respiration is the process of taking in oxygen and releasing carbon dioxide.
20. What is blood donation?
- Blood donation is the process of giving blood to help people in need.
Long Questions
1. How does the circulatory system work with the respiratory system?
- The circulatory system carries oxygen from the lungs to all body cells and removes carbon dioxide. The respiratory system helps in breathing, allowing gas exchange in the lungs.
2. What is the role of blood in the human body?
- Blood transports oxygen, nutrients, and hormones to different parts of the body. It also removes waste materials and fights infections to keep the body healthy.
3. Why is blood donation important?
- Blood donation saves lives in emergencies like accidents, surgeries, and illnesses. It ensures that hospitals always have enough blood available for patients in need.
4. How does the heart pump blood?
- The heart contracts to push oxygen-rich blood through arteries to body parts. It also pumps oxygen-poor blood to the lungs for purification before circulating again.
5. What happens when blood pressure is too high?
- High blood pressure (hypertension) damages blood vessels and increases the risk of heart attacks. It can also lead to kidney disease and strokes if not controlled.
6. How does the body remove waste?
- The kidneys filter waste from the blood and remove it as urine. The lungs remove carbon dioxide, and the skin removes waste through sweat.
7. What is the function of the diaphragm in breathing?
- The diaphragm moves down during inhalation to allow air into the lungs. During exhalation, it moves up, helping push air out of the lungs.
8. Why is the ‘O’ blood group called a universal donor?
- People with O-negative blood can donate to any blood group because it has no antigens. This prevents harmful reactions when transfused into different patients.
9. How does the circulatory system work with the digestive system?
- The digestive system breaks food into nutrients, which the circulatory system carries to all body cells. These nutrients provide energy for growth and activities.
10. How can we keep our heart healthy?
- A healthy diet, regular exercise, and reducing salt intake help maintain heart health. Avoiding smoking, alcohol, and stress also prevents heart diseases.
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