FREE NEET Biology Practice MCQ Test: Digestion And Absorption Exercise 4 Questions Answers With Detailed Explanations [PDF]

Answer: (c)

Answer: (b)

Tetanus is a medical condition characterised by a prolonged contraction of the skeletal muscle fibres. This disorder is not associated with the digestive system.

Diarrhoea is the unusual frequency of bowel movement and increased liquidity of the faecal discharge. The absorption of food is highly reduced in diarrhoea.

Jaundice represents one of the symptoms of liver malfunctioning in which bile is not excreted properly. Skin and eyes turn yellow due to the excess accumulation of bile pigments in the blood.

Dysentery is the inflammatory disorder of intestine, especially the colon, resulting in severe diarrhoea containing blood and mucus in the faeces, abdominal pain and fever.

Answer: (d)

Answer: (a)

Liver does not produce any digestive enzymes. They secrete alkaline bile juice.

Answer: (b)

Boy aged two years will have milk teeth. Milk teeth of man include 8 incisors, 4 canines, 8 molar. Premolars are absent.

Answer: (d)

The mucus produced by the stomach prevents damage that might be caused by exposure to acids, food and water dilute gastric juices, the stomach lining is quick to repair itself, and the release of gastric juices is controlled to avoid too high a concentration. Therefore all the options serve to protect the stomach from damaging itself with its acidic contents.

Answer: (d)

Answer: (b)

HCl does not directly help in digestion. HCl of gastric juice inactivates ptyalin and activates pepsin. It converts proenzyme prorennin and pepsinogen into active rennin and pepsin respectively by lowering the pH of stomach between 1.5 - 2.5. HCl acidifies the food and stops the action of ptyalin.

Answer: (a)

Contraction of gall bladder is induced by Cholecystokinin.

Answer: (d)

Answer: (b)

Answer: (b)

Most of the chemical digestion of food in humans is completed in the small intestine. Small intestine is the place where most of the digestive enzymes are secreted by the pancreas, and enter the small intestine via the pancreatic duct. The three major classes of nutrients that undergo digestion are proteins, lipids and carbohydrates.

Answer: (b)

Vitamin B complex is a group of water soluble vitamins that characteristically serve as components of coenzymes. Plants and many microorganisms can manufacture B-vitamins but dietary sources are essential for most animals. Heat and light tend to destroy B vitamins. The vitamin B complex consists of 8 different components - $B_1, B_2, B_3$, pantothenic acid, $B_6$, folic acid, biotin and $B_{12}$. Pantothenic acid functions as a part of coenzyme A in cell respiration while folic acid functions as part of coenzymes in protein and nucleic acid metabolism.

Answer: (a)

Answer: (d)

Answer: (d)

Marasmus is common in infants under one year of age. It develops due to deficiency of proteins and calories. It can be cured by providing adequate proteins, fats and carbohydrates.

Answer: (a)

End product of protein digestion is amino acid. Amino acids are organic acids that combine to form proteins. Both amino acids and proteins are the building blocks of life. When proteins are digested or broken down, amino acids are left. The human body uses amino acids to make proteins to help the body, like - breakdown of food, growth, repair of body tissue and many other body functions.

Answer: (d)

Answer: (a)

Continued consumption of fat rich diet causes hypercholesterolemia. Hypercholesterolemia is the presence of high levels of cholesterol in the blood. High cholesterol raises risk for heart disease, heart attack, and stroke. Kidney stones are solid mass made up of tiny crystals. There are different types of kidney stones. The exact cause depends on the type of stone like, calcium stones, uric acid stone etc. Vitamin A toxicity or hypervitaminosis A is having too much of vitamin A in the body. Ketonuria is condition in which ketone bodies are present in urine. Body products excess ketone bodies as an alternate source of energy during starvation or diabetes mellitus (type 1).

Answer: (d)