This chapter explains how animals carry out essential processes such as digestion, respiration, circulation, and excretion. It highlights the role of the heart, lungs, kidneys, and blood in maintaining life. The following MCQs will help you revise key concepts and test your understanding of these processes.
MCQ Questions for Class 7 Science Chapter 9 Life Processes in Animals with Answers
Question 1: Which system in animals is responsible for transporting oxygen, nutrients, and waste products?
a) Digestive system
b) Circulatory system
c) Respiratory system
d) Nervous system
Answer:
b) Circulatory system — It transports oxygen, nutrients, and waste products throughout the body.
Question 2: The blood is pumped by which organ in animals?
a) Brain
b) Heart
c) Lungs
d) Kidneys
Answer:
b) Heart — The heart pumps blood throughout the body.
Question 3: Which blood vessels carry blood away from the heart?
a) Veins
b) Arteries
c) Capillaries
d) Venules
Answer:
b) Arteries — They carry blood away from the heart.
Question 4: Which component of blood carries oxygen?
a) Plasma
b) Platelets
c) Red blood cells
d) White blood cells
Answer:
c) Red blood cells — They contain hemoglobin that carries oxygen.
Question 5: Which of the following is the main function of platelets?
a) Transporting oxygen
b) Blood clotting
c) Fighting infection
d) Carrying nutrients
Answer:
b) Blood clotting — Platelets help in clotting blood.
Question 6: What is the function of white blood cells?
a) Carry oxygen
b) Carry carbon dioxide
c) Fight infections
d) Help in clotting
Answer:
c) Fight infections — WBCs defend the body against pathogens.
Question 7: The liquid portion of blood is called?
a) Plasma
b) Hemoglobin
c) Serum
d) Platelets
Answer:
a) Plasma — It is the liquid medium of blood.
Question 8: Which chamber of the heart pumps oxygenated blood to the body?
a) Right atrium
b) Right ventricle
c) Left atrium
d) Left ventricle
Answer:
d) Left ventricle — It pumps oxygenated blood into the aorta.
Question 9: Which organ in humans filters nitrogenous waste from blood?
a) Heart
b) Lungs
c) Kidneys
d) Liver
Answer:
c) Kidneys — They filter nitrogenous waste and form urine.
Question 10: The functional unit of the kidney is called?
a) Neuron
b) Nephron
c) Alveoli
d) Glomerulus
Answer:
b) Nephron — It filters blood and removes waste.
Question 11: Which gas is exhaled in respiration?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer:
b) Carbon dioxide — It is released during respiration.
Question 12: In humans, exchange of gases takes place in?
a) Bronchi
b) Alveoli
c) Trachea
d) Larynx
Answer:
b) Alveoli — They allow oxygen and carbon dioxide exchange.
Question 13: The rhythmic contraction and relaxation of heart muscles is called?
a) Circulation
b) Heartbeat
c) Pulse
d) Respiration
Answer:
b) Heartbeat — It results from contraction and relaxation of heart muscles.
Question 14: Which blood vessel returns blood to the heart?
a) Arteries
b) Veins
c) Capillaries
d) Aorta
Answer:
b) Veins — They carry blood back to the heart.
Question 15: Which organ stores bile?
a) Liver
b) Gall bladder
c) Pancreas
d) Stomach
Answer:
b) Gall bladder — It stores bile produced by the liver.
Question 16: Which part of the digestive system absorbs most nutrients?
a) Stomach
b) Large intestine
c) Small intestine
d) Pancreas
Answer:
c) Small intestine — It absorbs most of the nutrients.
Question 17: Which organ secretes digestive enzymes and insulin?
a) Liver
b) Stomach
c) Pancreas
d) Kidney
Answer:
c) Pancreas — It secretes digestive enzymes and insulin.
Question 18: Which type of respiration occurs in the absence of oxygen?
a) Aerobic respiration
b) Anaerobic respiration
c) Cellular respiration
d) Pulmonary respiration
Answer:
b) Anaerobic respiration — It occurs without oxygen.
Question 19: In which form is oxygen carried in the blood?
a) Dissolved in plasma
b) Bound to hemoglobin
c) Bound to platelets
d) In white blood cells
Answer:
b) Bound to hemoglobin — Hemoglobin carries oxygen.
Question 20: Which part of the brain controls involuntary actions like breathing?
a) Cerebrum
b) Cerebellum
c) Medulla oblongata
d) Hypothalamus
Answer:
c) Medulla oblongata — It controls involuntary actions.
Question 21: Which organ produces urea?
a) Kidney
b) Liver
c) Lungs
d) Pancreas
Answer:
b) Liver — It produces urea as a waste product.
Question 22: Which is the largest artery in the human body?
a) Pulmonary artery
b) Aorta
c) Coronary artery
d) Carotid artery
Answer:
b) Aorta — It is the largest artery in the body.
Question 23: What is the main role of the diaphragm in breathing?
a) Pump blood
b) Absorb oxygen
c) Contract and expand lungs
d) Store air
Answer:
c) Contract and expand lungs — It helps in inhalation and exhalation.
Question 24: Which organ removes carbon dioxide from blood?
a) Kidney
b) Lungs
c) Liver
d) Heart
Answer:
b) Lungs — They remove carbon dioxide during exhalation.
Question 25: Which blood group is known as the universal donor?
a) A
b) B
c) AB
d) O
Answer:
d) O — People with O group can donate blood to all groups.
Question 26: Which blood group is the universal recipient?
a) A
b) B
c) AB
d) O
Answer:
c) AB — People with AB group can receive blood from all groups.
Question 27: The process of breaking down food into simple substances is called?
a) Digestion
b) Respiration
c) Excretion
d) Circulation
Answer:
a) Digestion — It breaks food into simpler substances.
Question 28: The process of removal of waste products from the body is called?
a) Respiration
b) Circulation
c) Excretion
d) Absorption
Answer:
c) Excretion — It removes waste products from the body.
Question 29: What type of blood is carried by pulmonary arteries?
a) Oxygenated blood
b) Deoxygenated blood
c) Both oxygenated and deoxygenated blood
d) Nutrient-rich blood
Answer:
b) Deoxygenated blood — Pulmonary arteries carry blood low in oxygen.
Question 30: What type of blood is carried by pulmonary veins?
a) Oxygenated blood
b) Deoxygenated blood
c) Nutrient-rich blood
d) Carbon dioxide-rich blood
Answer:
a) Oxygenated blood — Pulmonary veins carry oxygen-rich blood.
Question 31: The smallest blood vessels in the body are?
a) Arteries
b) Veins
c) Capillaries
d) Venules
Answer:
c) Capillaries — They are the smallest blood vessels.
Question 32: Which organ detoxifies harmful substances in the blood?
a) Heart
b) Kidney
c) Liver
d) Lungs
Answer:
c) Liver — It detoxifies harmful substances.
Question 33: Which fluid transports digested fat in the body?
a) Blood
b) Plasma
c) Lymph
d) Serum
Answer:
c) Lymph — It helps transport fats.
Question 34: Which gas is essential for aerobic respiration?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Methane
Answer:
a) Oxygen — It is essential for aerobic respiration.
Question 35: What is the main role of hemoglobin?
a) Help in clotting
b) Carry oxygen
c) Fight infections
d) Carry nutrients
Answer:
b) Carry oxygen — Hemoglobin carries oxygen to body cells.
Fill in the Blanks Questions for Class 7 Science Chapter 9 Life Processes in Animals MCQ
1. The red pigment present in red blood cells that carries oxygen is called ___.
Answer:
Hemoglobin
2. The pumping organ of the circulatory system is the ___.
Answer:
Heart
3. The functional unit of the kidney is the ___.
Answer:
Nephron
4. Tiny air sacs in the lungs where exchange of gases takes place are called ___.
Answer:
Alveoli
5. Blood vessels that carry blood away from the heart are called ___.
Answer:
Arteries
6. Blood vessels that carry blood back to the heart are called ___.
Answer:
Veins
7. The liquid part of the blood that transports nutrients and hormones is called ___.
Answer:
Plasma
8. The blood cells responsible for fighting infections are called ___.
Answer:
White blood cells (WBCs)
9. The process of removal of waste products from the body is called ___.
Answer:
Excretion
10. The organ that stores bile secreted by the liver is the ___.
Answer:
Gall bladder
11. The main organ that filters blood and produces urine is the ___.
Answer:
Kidney
12. The contraction and relaxation of heart muscles is called ___.
Answer:
Heartbeat
13. The largest artery in the human body is the ___.
Answer:
Aorta
14. The process by which food is broken down into simpler substances is called ___.
Answer:
Digestion
15. The process of releasing energy from food using oxygen is called ___.
Answer:
Aerobic respiration
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