Understanding life processes is an important part of biology. These processes—such as nutrition, respiration, transportation, and excretion—help living organisms survive, grow, and adapt. Whether you are a school student preparing for exams or someone revising basic biology concepts, multiple-choice questions (MCQs) make learning easier and more effective.
In this blog, we bring you 100 well-structured MCQs on life processes, covering every major topic in a simple and beginner-friendly way. These questions are designed to strengthen your understanding, improve recall, and help you practice for school tests, competitive exams, and quick revision.
Section 1: MCQs on Nutrition (1–25)
- Which of the following is a life process?
a) Sleeping
b) Respiration
c) Speaking
d) Jumping
Answer: b - The process of taking in food and using it is called:
a) Digestion
b) Nutrition
c) Absorption
d) Assimilation
Answer: b - Plants prepare food by:
a) Respiration
b) Photolysis
c) Photosynthesis
d) Fermentation
Answer: c - The green pigment in plants responsible for absorbing sunlight is:
a) Haemoglobin
b) Chlorophyll
c) Xanthophyll
d) Carotene
Answer: b - Heterotrophic nutrition is seen in:
a) All plants
b) Cactus
c) Animals
d) Algae
Answer: c - The openings in leaves for gaseous exchange are:
a) Lenticels
b) Stomata
c) Xylem
d) Phloem
Answer: b - The site of photosynthesis in a plant cell is:
a) Mitochondria
b) Ribosome
c) Chloroplast
d) Nucleus
Answer: c - Which mode of nutrition do fungi follow?
a) Autotrophic
b) Parasitic
c) Saprotrophic
d) Holozoic
Answer: c - Digestion in humans begins in the:
a) Stomach
b) Mouth
c) Small intestine
d) Liver
Answer: b - Which enzyme breaks down starch?
a) Lipase
b) Trypsin
c) Amylase
d) Pepsin
Answer: c - The organ that produces bile juice is:
a) Pancreas
b) Liver
c) Kidney
d) Spleen
Answer: b - Bile helps in the digestion of:
a) Proteins
b) Fats
c) Vitamins
d) Carbohydrates
Answer: b - The finger-like projections in the small intestine are called:
a) Villi
b) Alveoli
c) Nephrons
d) Lymph
Answer: a - Which organism shows holozoic nutrition?
a) Amoeba
b) Mushroom
c) Algae
d) Yeast
Answer: a - The food pipe is also called:
a) Trachea
b) Oesophagus
c) Larynx
d) Ureter
Answer: b - The process of breaking complex food into simpler substances is:
a) Absorption
b) Digestion
c) Assimilation
d) Egestion
Answer: b - Protein digestion starts in the:
a) Mouth
b) Stomach
c) Liver
d) Large intestine
Answer: b - Pancreatic juice contains enzymes to digest:
a) Fats only
b) Carbohydrates only
c) Proteins only
d) All of the above
Answer: d - Herbivores eat:
a) Meat
b) Only plants
c) Both plants and animals
d) Insects
Answer: b - The basic requirement for photosynthesis is:
a) Light
b) Water
c) CO₂
d) All of the above
Answer: d - Complete digestion of food occurs in:
a) Mouth
b) Stomach
c) Small intestine
d) Large intestine
Answer: c - The movement of food through the alimentary canal is called:
a) Diffusion
b) Peristalsis
c) Filtration
d) Ingestion
Answer: b - A parasitic plant is:
a) Neem
b) Mushroom
c) Cuscuta
d) Tulsi
Answer: c - The largest gland in the human body is:
a) Liver
b) Pancreas
c) Kidney
d) Thyroid
Answer: a - The organ that stores bile is:
a) Liver
b) Stomach
c) Gall bladder
d) Pancreas
Answer: c
Section 2: MCQs on Respiration (26–50)
- Respiration releases:
a) Water
b) Oxygen
c) Energy
d) Nitrogen
Answer: c - Aerobic respiration occurs in the presence of:
a) Sunlight
b) Water
c) Oxygen
d) CO₂
Answer: c - Anaerobic respiration produces:
a) More energy
b) Alcohol
c) Oxygen
d) Chlorophyll
Answer: b - The respiratory organ in fish is:
a) Lungs
b) Skin
c) Gills
d) Spiracles
Answer: c - Exchange of gases in humans occurs in:
a) Bronchi
b) Alveoli
c) Trachea
d) Nostrils
Answer: b - The dome-shaped muscular structure helping in breathing is:
a) Ribs
b) Diaphragm
c) Heart
d) Pelvis
Answer: b - Plants give out oxygen during:
a) Respiration
b) Transpiration
c) Photosynthesis
d) Osmosis
Answer: c - Which fuel do cells use for respiration?
a) Starch
b) Glucose
c) Fat
d) Protein
Answer: b - Human lungs are located in the:
a) Abdominal cavity
b) Thoracic cavity
c) Pelvic cavity
d) Vertebral column
Answer: b - The windpipe is also called:
a) Larynx
b) Trachea
c) Bronchi
d) Oesophagus
Answer: b - Respiration is essential for:
a) Food production
b) Growth and repair
c) Water storage
d) Excretion
Answer: b - Yeast respires anaerobically to produce:
a) Lactic acid
b) Alcohol and CO₂
c) Oxygen
d) Vitamin C
Answer: b - In human beings, respiration is a:
a) Physical process
b) Chemical process
c) Mechanical process
d) None
Answer: b - Breathing rate increases during exercise because:
a) We get hungry
b) More oxygen is needed
c) More digestion occurs
d) Body cools down
Answer: b - The number of alveoli in human lungs is about:
a) Thousands
b) Millions
c) Hundreds
d) Four
Answer: b - The flap that prevents food from entering the windpipe is:
a) Uvula
b) Epiglottis
c) Bronchi
d) Tonsils
Answer: b - Respiration that does not use oxygen is called:
a) Internal respiration
b) External respiration
c) Anaerobic respiration
d) Aerobic respiration
Answer: c - In humans, oxygen is carried mainly by:
a) Plasma
b) Haemoglobin
c) WBC
d) Platelets
Answer: b - Respiration in plants occurs:
a) Only during day
b) Only at night
c) Day and night
d) Never
Answer: c - The chemical equation for aerobic respiration involves:
a) Glucose + O₂
b) Starch + CO₂
c) Water + Chlorophyll
d) Nitrogen + Protein
Answer: a - Human respiration is controlled by:
a) Brain
b) Heart
c) Lungs
d) Kidney
Answer: a - Lactic acid is produced in muscle cells during:
a) Aerobic respiration
b) Anaerobic respiration
c) Digestion
d) Blood circulation
Answer: b - The main function of the respiratory system is:
a) Transport nutrients
b) Exchange gases
c) Remove urine
d) Pump blood
Answer: b - Insects breathe through:
a) Lungs
b) Gills
c) Spiracles
d) Skin
Answer: c - Respiration in amphibians occurs through:
a) Skin
b) Lungs
c) Gills (in larvae)
d) All of the above
Answer: d
Section 3: MCQs on Transportation (51–75)
- The fluid that transports substances in human bodies is:
a) Water
b) Blood
c) Saliva
d) Sweat
Answer: b - The red colour of blood is due to:
a) Plasma
b) DNA
c) Haemoglobin
d) WBC
Answer: c - Which blood cells fight infections?
a) RBC
b) WBC
c) Platelets
d) Plasma
Answer: b - The organ that pumps blood is:
a) Lung
b) Brain
c) Heart
d) Kidney
Answer: c - Blood vessels carrying blood away from heart are:
a) Veins
b) Arteries
c) Capillaries
d) Lymph vessels
Answer: b - The smallest blood vessels are:
a) Arteries
b) Veins
c) Capillaries
d) Valves
Answer: c - Which blood cells help in clotting?
a) RBC
b) WBC
c) Platelets
d) Plasma
Answer: c - The liquid portion of blood is:
a) Protein
b) Plasma
c) Haemoglobin
d) Platelets
Answer: b - The main organ responsible for circulating blood is:
a) Brain
b) Diaphragm
c) Heart
d) Stomach
Answer: c - Plants transport water using:
a) Phloem
b) Xylem
c) Stomata
d) Lenticels
Answer: b - The food in plants is transported through:
a) Xylem
b) Phloem
c) Root hairs
d) Bark
Answer: b - Lymph is a:
a) Blood pigment
b) Tissue fluid
c) Digestive juice
d) Enzyme
Answer: b - Which side of the heart carries deoxygenated blood?
a) Left
b) Right
c) Both
d) None
Answer: b - The heart has how many chambers?
a) Two
b) Three
c) Four
d) Five
Answer: c - The process by which water moves up in plants is:
a) Transpiration
b) Diffusion
c) Digestion
d) Respiration
Answer: a - Capillaries connect:
a) Arteries to veins
b) Arteries to heart
c) Veins to heart
d) Lungs to kidney
Answer: a - Blood pressure is measured in:
a) cm
b) mmHg
c) mg
d) grams
Answer: b - The pumping sound of the heart is due to:
a) Opening of valves
b) Closing of valves
c) Movement of blood
d) Lung expansion
Answer: b - Transport system in plants is simpler because:
a) They don’t move
b) They don’t need water
c) They grow slower
d) Their organs need less energy
Answer: a - The largest artery is:
a) Pulmonary vein
b) Aorta
c) Vena cava
d) Renal artery
Answer: b - The blood vessel carrying oxygen-rich blood to the heart is:
a) Pulmonary artery
b) Pulmonary vein
c) Aorta
d) Vena cava
Answer: b - The watery fluid that leaks from blood capillaries is:
a) Lymph
b) Plasma
c) Mucus
d) Saliva
Answer: a - Platelets live for about:
a) 10 days
b) 100 days
c) 1 day
d) 120 days
Answer: a - The heart is protected by:
a) Rib cage
b) Skull
c) Pelvis
d) Spine
Answer: a - Which component carries food in plants?
a) Xylem
b) Phloem
c) Roots
d) Lenticels
Answer: b
Section 4: MCQs on Excretion (76–100)
- The process of removing waste from the body is:
a) Digestion
b) Respiration
c) Excretion
d) Circulation
Answer: c - The excretory organ in humans is:
a) Heart
b) Kidney
c) Liver
d) Lungs
Answer: b - The basic filtration unit of the kidney is:
a) Neuron
b) Nephron
c) Alveolus
d) Villi
Answer: b - Urine is stored in the:
a) Urethra
b) Bladder
c) Kidney
d) Liver
Answer: b - Sweating helps in:
a) Digestion
b) Temperature control
c) Blood production
d) Breathing
Answer: b - The excretory product of plants is:
a) Carbon dioxide
b) Urine
c) Urea
d) Sweat
Answer: a - The tube connecting kidney to bladder is:
a) Ureter
b) Urethra
c) Artery
d) Vein
Answer: a - Which of the following is not an excretory product?
a) Urea
b) Sweating
c) Oxygen
d) CO₂
Answer: c - The skin removes waste through:
a) Mucus
b) Sweat
c) Tears
d) Wax
Answer: b - Kidney failure is treated by:
a) Dialysis
b) Insulin
c) Vaccination
d) Heart transplant
Answer: a - Plants excrete waste through:
a) Stomata
b) Roots
c) Bark
d) All of the above
Answer: d - The organ that converts harmful substances into harmless forms:
a) Heart
b) Liver
c) Lung
d) Kidney
Answer: b - Water loss in plants occurs mainly through:
a) Roots
b) Stem
c) Transpiration
d) Photosynthesis
Answer: c - The major nitrogenous waste in humans is:
a) Uric acid
b) Ammonia
c) Urea
d) Salt
Answer: c - CO₂ in humans is excreted by:
a) Kidney
b) Liver
c) Lungs
d) Skin
Answer: c - Excess water in the body is removed through:
a) Urine
b) Blood
c) Teeth
d) Brain
Answer: a - The part of nephron where filtration occurs:
a) Glomerulus
b) Tubule
c) Bowman’s capsule
d) Ureter
Answer: a - The urine-forming organ is:
a) Kidney
b) Bladder
c) Heart
d) Lung
Answer: a - The pigment that colours urine yellow is:
a) Bilirubin
b) Urochrome
c) Melanin
d) Haemoglobin
Answer: b - Liver removes:
a) Urea
b) Bile pigments
c) Oxygen
d) Glucose
Answer: b - Plants sometimes store waste as:
a) Latex
b) Resin
c) Gum
d) All of the above
Answer: d - The excretory structure in amoeba is:
a) Nephron
b) Contractile vacuole
c) Kidney
d) Trachea
Answer: b - Kidneys regulate the balance of:
a) Proteins
b) Salts and water
c) Vitamins
d) Hormones
Answer: b - Urine passes out of the body through the:
a) Urethra
b) Ureter
c) Vena cava
d) Larynx
Answer: a - Which is not a function of the kidney?
a) Remove urea
b) Maintain water balance
c) Produce oxygen
d) Filter blood
Answer: c
Life processes are the foundation of biology, and understanding them helps us appreciate how living organisms function every day. Through these 100 MCQs, you have revised all major topics—nutrition, respiration, transportation, and excretion—in a quick and effective way. Such practice questions not only strengthen your basics but also prepare you well for school exams and competitive tests. Keep revising regularly, attempt more quizzes, and continue exploring the amazing world of life science. The more you practice, the stronger your understanding becomes.
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