Class 10 Chapter 5 Mcqs Science Ncert

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Extra 40 multiple-choice questions (MCQs) with answers on Chapter:5 Life Processes for Class 10 CBSE Science:

MCQs

Which of the following is NOT a type of heterotrophic nutrition?

a) Parasitic

b) Autotrophic

c) Saprophytic

d) Holozoic

Ans:

b) Autotrophic

The process of intake of food and its utilization in the body is called:

a) Excretion

b) Nutrition

c) Digestion

d) Circulation

Ans:

b) Nutrition

Which pigment is responsible for photosynthesis?

Haemoglobin

b) Chlorophyll

c) Carotene

d) Myoglobin

Ans:

b) Chlorophyll

Which gas is released during photosynthesis?

a) Oxygen

b) Carbon dioxide

c) Hydrogen

d) Nitrogen

Ans:

a) Oxygen

In plants, stomata help in:

a) Respiration

b) Transpiration

c) Photosynthesis

d) All of the above

Ans:

d) All of the above

Which of the following is the end product of digestion of carbohydrates?

a) Amino acids

b) Glucose

c) Fatty acids

d) Water

Ans:

b) Glucose

Which part of the human digestive system secretes hydrochloric acid?

a) Mouth

b) Stomach

c) Small intestine

d) Liver

Ans:

b) Stomach

The enzyme present in saliva is:

a) Pepsin

b) Amylase

c) Trypsin

d) Lipase

Ans:

b) Amylase

Bile is produced by which organ?

a) Liver

b) Stomach

c) Pancreas

d) Small intestine

Ans:

a) Liver

What is the function of bile juice?

a) Digest carbohydrates

b) Digest proteins

c) Emulsification of fats

d) Produce hydrochloric acid

Ans:

c) Emulsification of fats

The process of breaking down food to release energy is called:

a) Digestion

b) Excretion

c) Respiration

d) Circulation

Ans:

c) Respiration

Which of the following is the site of respiration in a cell?

a) Nucleus

b) Mitochondria

c) Chloroplast

d) Ribosome

Ans:

b) Mitochondria

The energy released during respiration is stored in the form of:

a) DNA

b) RNA

c) ATP

d) Glucose

Ans:

c) ATP

What is the by-product of anaerobic respiration in yeast?

a) Lactic acid

b) Ethanol and CO₂

c) Glucose

d) Oxygen

Ans:

b) Ethanol and CO₂

Which type of respiration occurs in humans?

a) Aerobic

b) Anaerobic

c) Both a and b

d) None of these

Ans:

c) Both a and b

The windpipe is also known as:

Oesophagus

b) Trachea

c) Larynx

d) Alveoli

Ans:

b) Trachea

The structure where gas exchange occurs in the lungs is:

a) Bronchi

b) Alveoli

c) Trachea

d) Bronchioles

Ans:

b) Alveoli

What is the normal breathing rate in humans per minute?

a) 5-10 times

b) 12-20 times

c) 30-40 times

d) 50-60 times

Ans:

b) 12-20 times

In which part of the human body is oxygenated and deoxygenated blood mixed?

a) Liver

b) Heart

c) Lungs

d) None of the above

Ans:

d) None of the above

Which pigment helps in oxygen transport in blood?

Haemoglobin

b) Chlorophyll

c) Myosin

d) Myoglobin

Ans:

Haemoglobin

The human heart has how many chambers?

a) Two

b) Three

c) Four

d) Five

Ans:

c) Four

Which artery carries deoxygenated blood?

a) Pulmonary artery

b) Aorta

c) Pulmonary vein

d) Coronary artery

Ans:

a) Pulmonary artery

The largest artery in the human body is:

a) Pulmonary artery

b) Coronary artery

c) Aorta

d) Vena cava

Ans:

c) Aorta

The liquid part of blood is called:

a) Plasma

b) Platelets

c) RBC

d) WBC

Ans:

a) Plasma

Which blood cells fight against infections?

a) RBC

b) WBC

c) Platelets

d) None of these

Ans:

b) WBC

What is the main function of platelets?

a) Oxygen transport

b) Blood clotting

c) Fighting infections

d) Digesting food

Ans:

b) Blood clotting

The heart pumps blood to the lungs through:

a) Pulmonary vein

b) Pulmonary artery

c) Aorta

d) Vena cava

Ans:

b) Pulmonary artery

The structural and functional unit of the kidney is:

a) Nephron

b) Neuron

c) Alveolus

d) Glomerulus

Ans:

a) Nephron

The process of removal of waste from the body is called:

a) Circulation

b) Excretion

c) Respiration

d) Photosynthesis

Ans:

b) Excretion

The primary excretory product in humans is:

a) Urea

b) Ammonia

c) Uric acid

d) Glucose

Ans:

a) Urea

What is the basic filtration unit in kidneys?

a) Alveoli

b) Nephron

c) Neuron

d) Platelets

Ans:

b) Nephron

Which organ removes urea from the blood?

a) Liver

b) Kidney

c) Heart

d) Lungs

Ans:

b) Kidney

Which organ removes CO₂ from the body?

a) Lungs

b) Liver

c) Kidney

d) Skin

Ans:

a) Lungs

The main function of sweat glands is to:

a) Control body temperature

b) Excrete urea

c) Excrete water

d) All of the above

Ans:

d) All of the above

In which organ does most of the absorption of digested food occur?

a) Stomach

b) Large intestine

c) Small intestine

d) Liver

Ans:

c) Small intestine

Which enzyme is responsible for protein digestion in the stomach?

a) Trypsin

b) Pepsin

c) Lipase

d) Amylase

Ans:

b) Pepsin

The part of the brain that controls involuntary actions like heartbeat and breathing is:

a) Cerebrum

b) Cerebellum

c) Medulla oblongata

d) Hypothalamus

Ans:

c) Medulla oblongata

Which blood vessel carries oxygenated blood from the lungs to the heart?

a) Pulmonary artery

b) Pulmonary vein

c) Vena cava

d) Aorta

Ans:

b) Pulmonary vein

The excretory organ in

planaria

is called:

a) Nephron

b) Flame cells

c) Malpighian tubules

d) Kidney

Ans:

b) Flame cells

Which of the following is NOT a function of the human stomach?

a) Secretion of bile

b) Secretion of gastric juices

c) Mechanical churning of food

d) Initiation of protein digestion

Answer: a) Secretion of bile