Digestive System — Set 5
Biology · पाचन तंत्र · Questions 41–50 of 50
Which vitamin is synthesized by bacteria present in the human large intestine?
Correct Answer: B. Vitamin K
Symbiotic bacteria like E. coli in the colon produce Vitamin K and some B vitamins as metabolic byproducts. Vitamin K is essential for the process of blood clotting. This represents a mutually beneficial relationship between humans and microbes.
The yellowish pigment in bile, which can cause jaundice if present in excess, is?
Correct Answer: B. Bilirubin
Bilirubin is a waste product formed from the breakdown of old red blood cells in the liver. It is normally excreted in bile and gives feces their typical brown color. If the liver cannot process it, the skin and eyes may turn yellow.
Which part of the digestive system connects the ileum to the colon?
Correct Answer: A. Ileocaecal valve
The ileocaecal valve prevents the waste material in the large intestine from moving back into the small intestine. It is a one-way valve located at the end of the small intestine. It opens periodically to allow small amounts of waste into the caecum.
Which organ in the body acts as a 'chemical factory' for processing nutrients?
Correct Answer: B. Liver
The liver processes almost everything that enters the bloodstream from the digestive tract. It stores vitamins, regulates blood sugar, and converts toxic ammonia into urea. It is central to the body's overall metabolism.
What is the total number of incisors in a set of permanent human teeth?
Correct Answer: B. 8
There are four incisors in the upper jaw and four in the lower jaw, totaling eight. They are the chisel-shaped front teeth used for cutting and biting food. They are the first teeth to erupt in a child's mouth.
Which enzyme converts starch into maltose in the small intestine?
Correct Answer: D. Pancreatic Amylase
Pancreatic amylase is secreted into the duodenum to continue the carbohydrate digestion started by saliva. It works in an alkaline environment created by pancreatic juice. This ensures that almost all starch is converted into simpler sugars.
The final part of the digestive system where feces are stored before egestion is the?
Correct Answer: A. Rectum
The rectum is a straight chamber that connects the colon to the anus. It triggers nerves when it is full to signal the need for a bowel movement. It acts as a temporary holding area for waste material.
Which hormone stimulates the release of bile from the gallbladder?
Correct Answer: D. Cholecystokinin
Cholecystokinin (CCK) is produced by the small intestine in response to the presence of fats. It signals the gallbladder to contract and the pancreas to release enzymes. This hormonal control ensures that digestive juices are available exactly when needed.
What is the role of 'Lysozyme' found in human saliva?
Correct Answer: A. Killing bacteria
Lysozyme is an antimicrobial enzyme that damages the cell walls of certain bacteria. It acts as a first line of defense against oral infections. It is also found in other body fluids like tears and mucus.
The dental condition commonly known as 'Wisdom teeth' refers to the?
Correct Answer: A. Third molars
Wisdom teeth are the last set of molars to emerge, usually between the ages of 17 and 25. Many people do not have enough space in their jaws for these teeth, leading to impaction. In such cases, they often need to be surgically removed.