10 questions with answers and explanations
Multiple-choice questions at NCERT Class 11 level, written as sample content for the Quizly demo course — not past NEET paper questions. Try each one, then open Show answer for the correct option and a one-line explanation.
Answer: B. Ptyalin (salivary amylase)
Ptyalin hydrolyses about 30% of dietary starch into maltose in the buccal cavity, working best at a near-neutral pH of about 6.8.
Answer: B. Gall bladder
Bile is secreted continuously by hepatocytes, concentrated and stored in the gall bladder, and released into the duodenum through the bile duct.
Answer: B. Stomach
Gastric glands in the stomach mucosa contain peptic (chief) cells secreting pepsinogen and parietal (oxyntic) cells secreting HCl.
Answer: C. Ileum
The ileum carries the densest villi and microvilli, giving the largest surface area; the colon absorbs mainly water and some minerals.
Answer: B. Enterokinase
Enterokinase (enteropeptidase), secreted by the intestinal mucosa, activates trypsinogen; trypsin then activates the other pancreatic proenzymes.
Answer: B. Diaphragm
Contraction of the diaphragm flattens it and increases the vertical volume of the thoracic chamber, accounting for roughly 75% of quiet inspiration.
Answer: A. 500 mL
Tidal volume is the air inspired or expired in one normal breath — about 500 mL, i.e. roughly 6000–8000 mL per minute.
Answer: B. ERV + TV + IRV
Vital capacity is the maximum volume that can be breathed out after a maximum inspiration. Residual volume is never included in it.
Answer: C. Bicarbonate ions
About 70% of CO2 travels as HCO3- ions, roughly 20–25% as carbamino-haemoglobin and only about 7% dissolved in plasma.
Answer: B. Red blood cells
Carbonic anhydrase inside erythrocytes catalyses CO2 + H2O <-> H2CO3 in both directions, which is what makes bicarbonate transport fast enough.
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