Nokea
Number of teeth which are monophyodont in man is-
- A. 4
- B. 22
- C. 32
- D. 12
Correct Answer: D
Rationale: Humans have 12 monophyodont teeth (premolars and molars), which erupt only once, unlike diphyodont teeth (incisors, canines) that replace milk teeth.
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Match: Villi
- A. projections in the small intestine that absorb nutrients
- B. storage structures
- C. enzyme producers
- D. muscular layers
Correct Answer: A
Rationale: Villi are finger-like projections in the small intestine that increase surface area for efficient nutrient absorption.
Why is pepsin not secreted into the stomach?
- A. Because it would digest the stomach
- B. It is secreted into the stomach
- C. Because it would be inactivated by the acid in the stomach
- D. It is secreted into the intestine
Correct Answer: B
Rationale: Pepsin is secreted into the stomach as pepsinogen by chief cells and activated by stomach acid. It does not digest the stomach due to the protective mucus layer.
Surface mucous cells show the following EXCEPT:
- A. Found in the isthmus of the fundic glands.
- B. Contain PAS +ve secretory granules.
- C. Secrete acidic mucous.
- D. Continuous with the covering epith of the stomach
Correct Answer: C
Rationale: Surface mucous cells secrete neutral to alkaline mucus, not acidic mucus, to protect the gastric mucosa.
Optimum pH for salivary amylase
- A. 1.8
- B. 7.8
- C. 6.8
- D. 3.4
Correct Answer: C
Rationale: Salivary amylase (ptyalin) works optimally at a pH of around 6.8, close to neutral.
Besides your urinary system, what other organs in your body help in excretion?
- A. lungs
- B. skin
- C. skin and lungs
- D. none of the above
Correct Answer: C
Rationale: Both the lungs (excreting carbon dioxide) and skin (excreting sweat) aid in excretion.