Question
Where is most water absorbed in the alimentary canal?
(A) large intestine
(B) oesophagus
(C) small intestine
(D) stomach
▶️Answer/Explanation
Ans : C
The correct answer is C, because :
Water is absorbed in small intestine and large intestine.
Whereas, most water is absorbed in small intestine, but water doesn’t gets absorbed in oesophagus and stomach.
Question
Biological washing powders can remove stains from clothes.
What must a washing powder contain, to remove an oil stain from a t-shirt?
(A) amylase
(B) lipase
(C) pectinase
(D) protease
▶️Answer/Explanation
Ans: B
The correct answer is B, because :
Lipase acts on oil stains by breaking down lipid molecules into small pieces, which are easily gets attached to surfactant molecules and these forms micelli and these are removed from cloth stains.
- amylase acts on starch molecules
- pectinase acts on pectin
- protease acts on proteins
Question
Which organ secretes hydrochloric acid?
▶️Answer/Explanation
Ans: C
The correct answer is C, because :
In the depicted image, labelling is as
- A – Gall bladder (It produces bile juice, helping in digestion)
- B – lungs (helps in breathing)
- C – stomach (produces HCl helping in digestion)
- D – large intestine (respondiblr for absorption and passage of undigested waste)
Question
What is the definition of chemical digestion?
(A) Large insoluble molecules are changed into smaller soluble molecules.
(B) Large soluble molecules are changed into smaller soluble molecules.
(C) Small insoluble molecules and ions are passed through the wall of the small intestine.
(D) Small soluble molecules and ions are passed through the wall of the small intestine.
▶️Answer/Explanation
Ans A
The correct answer is A, because :
The digestion is divided into physical digestion and chemical digestion .
Chemical digestion is digestion of large insoluble molecules into smaller soluble molecules with help of enzymes.
Physical digestion is breakdown of complex food substances into smaller substances enabling them for absorption.