This chapter discusses how materials are transported within organisms. These Class 9 Biology Chapter 9 MCQs help you understand key concepts like transport in plants and animals, components of blood, heart structure, blood vessels, and the lymphatic system.
1. Which part of the human body is responsible for pumping blood?
- A. Lungs
- B. Heart ✅
- C. Liver
- D. Kidney
Explanation: The heart pumps blood throughout the body to transport nutrients and oxygen.
2. What are the vessels that carry blood away from the heart?
- A. Veins
- B. Arteries ✅
- C. Capillaries
- D. Lymph vessels
Explanation: Arteries transport oxygenated blood away from the heart to the body.
3. Which blood component helps in clotting?
- A. Red blood cells
- B. Platelets ✅
- C. Plasma
- D. White blood cells
Explanation: Platelets (thrombocytes) assist in blood clotting to prevent excessive bleeding.
4. Which part of the plant is mainly responsible for water transport?
- A. Phloem
- B. Xylem ✅
- C. Cortex
- D. Epidermis
Explanation: Xylem transports water and minerals from roots to other parts of the plant.
5. The process by which water is lost from leaves is called:
- A. Absorption
- B. Transpiration ✅
- C. Photosynthesis
- D. Respiration
Explanation: Transpiration is the loss of water vapor through stomata in leaves.
6. What is the main function of phloem in plants?
- A. Water transport
- B. Structural support
- C. Transport of food ✅
- D. Absorption of minerals
Explanation: Phloem carries the food produced in leaves to other plant parts.
7. Which blood vessels connect arteries and veins?
- A. Aorta
- B. Pulmonary vessels
- C. Capillaries ✅
- D. Coronary arteries
Explanation: Capillaries are tiny blood vessels where exchange of materials occurs between blood and tissues.
8. Which part of the blood transports oxygen?
- A. Plasma
- B. Platelets
- C. Red blood cells ✅
- D. White blood cells
Explanation: RBCs contain hemoglobin which binds and carries oxygen to body tissues.
9. What is the function of valves in veins?
- A. Increase blood pressure
- B. Prevent backflow of blood ✅
- C. Absorb nutrients
- D. Connect to arteries
Explanation: Valves ensure blood flows in one direction toward the heart.
10. Lymph is part of which body system?
- A. Excretory system
- B. Lymphatic system ✅
- C. Digestive system
- D. Endocrine system
Explanation: Lymph is part of the lymphatic system which returns fluid to the circulatory system and helps in immunity.
11. Which structure prevents mixing of oxygenated and deoxygenated blood in humans?
- A. Heart valves
- B. Septum ✅
- C. Capillaries
- D. Atrium
Explanation: The septum divides the heart into left and right sides, preventing mixing of oxygen-rich and oxygen-poor blood.
12. What causes blood to circulate through the body?
- A. Muscular movement
- B. Pumping action of heart ✅
- C. Gravity
- D. Breathing
Explanation: The heart pumps blood, creating pressure that circulates blood through vessels.
13. What is the main role of white blood cells?
- A. Carry oxygen
- B. Fight infections ✅
- C. Clot blood
- D. Transport waste
Explanation: White blood cells defend the body against pathogens and infections.
14. Which part of the heart receives oxygenated blood from lungs?
- A. Right atrium
- B. Left atrium ✅
- C. Right ventricle
- D. Left ventricle
Explanation: The left atrium receives oxygen-rich blood from the lungs via pulmonary veins.
15. Which tissue in plants is responsible for food transport?
- A. Xylem
- B. Phloem ✅
- C. Cambium
- D. Parenchyma
Explanation: Phloem distributes the food produced in leaves to the rest of the plant body.