Discussion
Consider the following statements :
(i) Dr. Beaumont is the person who on the basis of his experiments found many secrets about digestion of food.
(ii) He found that a stomach churns the food to digest it with the help of digestive juices secreted by it.
(iii) He also found that the juice in our stomach is basic.
(iv) Dr. Beaumont did experiments on the stomach of the same person for nineteen years.
The correct statements are :
Answer: D
The correct statements are (i) and (ii).
William Beaumont, an American army surgeon, studied digestion through a wound in the stomach of Alexis St. Martin that never fully closed after a gunshot accident in 1822. Through it he observed that the stomach churns food and digests it with juices it secretes, so (i) and (ii) are true. This story appears in the NCERT Class V EVS book.
Statement (iii) is false: Beaumont found that the gastric juice is acidic, not basic; it contains hydrochloric acid. Statement (iv) overstates the time: his experiments ran from 1825 to 1833, well under ten years, not nineteen. Every option including (iii) or (iv) is therefore wrong.
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