Online Test — Life Processes
15 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 15
Which of these is NOT a life process?
Nutrition
Respiration
Excretion
Rusting
Explanation: Rusting is a chemical change in metals, not a life process.
Question 2 of 15
Organisms that prepare their own food are called:
Heterotrophs
Autotrophs
Parasites
Saprotrophs
Explanation: Autotrophs, like green plants, make their own food.
Question 3 of 15
The raw materials for photosynthesis are:
Oxygen and glucose
Carbon dioxide and water
Urea and water
Nitrogen and oxygen
Explanation: Photosynthesis uses carbon dioxide and water (with sunlight and chlorophyll).
Question 4 of 15
Gaseous exchange in a leaf takes place through the:
Stomata
Xylem
Phloem
Nephron
Explanation: Stomata are pores for gas exchange, controlled by guard cells.
Question 5 of 15
Salivary amylase begins the digestion of:
Proteins
Fats
Starch
Vitamins
Explanation: Salivary amylase breaks down starch into sugar in the mouth.
Question 6 of 15
The enzyme pepsin, which digests proteins, acts in the:
Mouth
Stomach
Large intestine
Liver
Explanation: Pepsin acts in the acidic medium of the stomach to digest proteins.
Question 7 of 15
Bile, which helps digest fats by emulsification, is produced by the:
Pancreas
Liver
Stomach
Kidney
Explanation: Bile is produced by the liver and emulsifies fats.
Question 8 of 15
The finger-like projections that increase surface area for absorption in the small intestine are:
Alveoli
Nephrons
Villi
Neurons
Explanation: Villi increase the surface area for absorption of digested food.
Question 9 of 15
Aerobic respiration takes place in the:
Nucleus
Mitochondria
Cell wall
Vacuole
Explanation: Mitochondria are the site of aerobic respiration.
Question 10 of 15
Anaerobic respiration in yeast produces ethanol and:
Lactic acid
Carbon dioxide
Oxygen
Urea
Explanation: In yeast, glucose breaks down into ethanol and carbon dioxide (fermentation).
Question 11 of 15
Exchange of gases in the lungs occurs in the:
Trachea
Bronchi
Alveoli
Bronchioles
Explanation: The thin-walled alveoli are the site of gas exchange.
Question 12 of 15
The human heart has how many chambers?
Two
Three
Four
One
Explanation: The human heart has four chambers: two atria and two ventricles.
Question 13 of 15
In plants, food prepared in the leaves is transported by the:
Xylem
Phloem
Stomata
Roots only
Explanation: Phloem transports food (translocation); xylem carries water and minerals.
Question 14 of 15
The basic filtering unit of the kidney is the:
Nephron
Neuron
Villus
Alveolus
Explanation: The nephron is the kidney's filtering unit.
Question 15 of 15
The main nitrogenous waste excreted in human urine is:
Glucose
Urea
Protein
Starch
Explanation: Urea is the main nitrogenous waste removed by the kidneys.