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Important Questions for Class 11 Biological science Chapter 16 Digestion and Absorption are provided here for students to help in their exam preparation. They must exercise these questions to comprehend all the of import topics of this affiliate. Students volition become thoroughly prepared then that they can answers any type of question asked from this chapter.

Important Questions for Class 11 Biological science Chapter 16 Digestion and Absorption

Food is ane of the most fundamental requirements for living entities to survive. In humans, the digestive system consists of the digestive glands and the alimentary canal. Food provides all the minerals, vitamins and organic compounds that are required to grow and repair the body. Water plays a vital office in the digestion procedure and prevents the torso from entering a state of dehydration. Biomolecules in food cannot be utilized by our body and hence need to exist cleaved down into simpler substances in the digestive organization. This process is known as digestion.

Very Curt Answer Type Questions

Q.one. What is the food called when food blends completely with acidic gastric juices of the stomach by the churning movements of the muscular wall.

A.1. The food stays in the stomach for 4-5 hours during which it gets composite completely with the acidic gastric juice nowadays in the stomach through churning movements of the muscular walls. At this point, the food is referred to as chyme.

Q.2. Proper noun the tissue or cells that secrete the enzyme enterokinase, which activates Trypsinogen. How is information technology activated?

A.2. The enzyme enterokinase activates trypsinogen to trypsin. The enzyme is secreted past the intestinal mucosa.

Q.three. Where in the alimentary canal, absorption of h2o, alcohol and uncomplicated sugars have identify?

A.3. In the wall of the tum.

Q.4. List the enzymes that are involved in the breakup of nucleotides into bases and sugars.

A.4. Nucleotidases and nucleosidases.

Q.5. What is digestion?

A.5. Digestion is the process of converting complex food substances into simpler substances that tin be absorbed through mechanical and biochemical methods.

Q.6. Name the type of teeth-attachment to the jawbones wherein each molar is embedded in a socket of jawbones.

A.half-dozen. The type of teeth is called Codont.

Q.viii. Which glands are associated with the gastrointestinal tract?

A.8. The salivary glands, the liver and the pancreas, are the lists of glands, associated with the alimentary culvert.

Q.ix. What is the Pancreas?

A.9. The pancreas is an abdominal organ located in the stomach,  backside the abdomen and surrounded by spleen, liver and small intestine. It is a vital office of the human digestive organization and is responsible for regulating blood carbohydrate levels.

Q.10. What is the Liver?

A.x. The liver is the largest organ located in the correct upper quadrant of the belly and below the diaphragm. Information technology plays a vital role in the digestion of fats, metabolism of carbohydrates and formation of bile.

Q.11.What are the functions of bile?

A.eleven.Bile is a dark yellowish-greenish or brown colour fluid produced past the liver and stored within the gallbladder. Information technology comprises organic molecules such equally bile acids, slats, bilirubin and cholesterol, and water.

Q.12.Describe the process of elimination.

A.12.Elimination is a concluding procedure of digestion. In this process, the food residues that cannot exist digested or captivated are excreted or egested from the body as semi-solid faeces.

Q.13.What is constipation?

A.xiii.Constipation is defined as the digestive disorders, associated with the irregular and difficult bowel movement characterized past hardened faeces.

Q.14. Where does the procedure of digestion take place?

A.14.The process of digestion begins from the mouth and is then carried on to the breadbasket, to the small intestine, big intestine and then to the anus.

Q.xv. What is the Alimentary canal?

A.15.The gastrointestinal tract is the pathway by which food enters our body. It is a tube-like construction, which starts from the mouth and ends at the big intestine.

Brusque Answer Type Questions

Q.1. What is the pancreas? What are the main secretions of the pancreas,which aids in digestion?

A.i. The pancreas is a gland that has endocrine and exocrine parts required in producing hormones and digestive enzymes. The inactive enzymes involved in digestion and secreted by pancreas are as follows:

1. Lipases
2. Amylases
3. Nucleases
4. Trypsinogen
5. Chymotrypsinogen
6. Procarboxypeptidases

Q.2. Write the organs of the human alimentary canal. Mention the major digestive glands along with their locations

A.2. The alimentary canal consists of the anterior opening – the pharynx, buccal cavity, mouth, oesophagus, stomach, pocket-size intestine, large intestine, and anus.

The digestive glands are -:

1. Salivary glands – Saliva is produced by iii pairs of salivary glands, which are – the parotids (cheek), the submandibular/sub-maxillary(lower jaw) and the sublingual (nether the tongue).
2. The pancreas – Information technology is located between the limbs of the C-shaped duodenum.
3. The liver – Information technology is located in the intestinal cavity, beneath the diaphragm.

Q.3. What is the significance of the gall float? Write the consequence if it stops performance or is removed.

A.3. The gall bladder is a pear-shaped sac-like composition, which is continued to the dorsal surface of the liver via connective tissue. The hepatic cells of the liver secrete bile, which moves through the hepatic ducts gets accumulated in the gall bladder.

If the gall is removed or turns non-functional, the bile would continuously run from the liver into the intestine, without existence concentrated enough as the bile originated in the gall bladder. A low-fat diet is suggested fifty-fifty though the torso adapts as the digestion of fat is seemingly decreased after gall bladder is removed.

Q.4. Write the three major types of cells present in the gastric glands. Listing their secretions.

A.4. Gastric glands are present in the mucosa of the stomach. The three major cells are:

Cell Type	Secretions
Mucous neck cells	Mucus
Chief or peptic cells	Proenzyme pepsinogen
Oxyntic or parietal cells	HC1 and intrinsic factor

Q.5. How is the abdominal mucosa guarded against the acidic food entering from the stomach?

A.five. The highly concentrated hydrochloric acid rich food is prevented from excoriation considering of the fungus secreted past the goblet cells forth with the bicarbonates, which are pregnant in lubrication and protection of the mucosal epithelium.

Q6. What is the divergence between digestion and absorption?

A.6. Digestion is the process of burdensome or digesting large and insoluble food molecules into smaller and soluble molecules for easy absorption into the bloodstream.

Absorption is the mechanical and digestive processes of arresting or assimilation of substances into the cells or across the tissues and organs through the process of diffusion or osmosis.

Q.7. What is the process of digestion and absorption of carbohydrates?

A.seven. Carbohydrates consist of monosaccharides, disaccharides and complex carbohydrates, including starch, glycogen, and fibre. The digestion and assimilation of carbohydrates begin with the breakdown of disaccharides and complex carbohydrates into monosaccharides for absorption, and the process begins from the in the rima oris via the process of chewing and with the release of enzyme amylase from the salivary glands. The digestion and absorption of carbohydrates are completed in the small intestine, with the help of amylase secreted past the pancreas.

The below diagram explains the process and the different enzymes involved in the digestion and absorption of carbohydrates.

Q.8. What is digestion, mechanical digestion and chemical digestion?

A.8.

Digestion –It is the process of converting big insoluble food molecules into small, soluble and absorbable forms. The complete procedure of digestion occurs in a sequential mode by a spousal relationship of both methods:

1. Mechanical digestion –In this process of digestion, the nutrient is completely cleaved down into smaller fragments through the physical procedure. This physical process begins from mouth to the stomach via the deed of chewing in the mouth, churning in the breadbasket and segmentation in the small intestine.
2. Chemical digestion – In this process of digestion, the food is broken down by the action of chemical agents – such as acids, bile and enzymes.

Q.ix. What are enzymes?

A.9.Enzymes can be divers as the biological molecules or biological catalysts, which significantly speed up the charge per unit of digestion past lowering the activation energy. Enzymes also facilitate the digestion of sure molecules to occur independently, in distinct locations, at body temperatures and at sufficient speeds.

Q.10. What is indigestion?

A.10.Indigestion, also known equally dyspepsia, is a medical term, which describes the hurting and discomfort in the upper belly. It is a type of a functional disorder, caused past the aberrant functioning of the digestive system or gastrointestinal organs.

Long Answer Type Questions

Q.1. Write the changes occurring in the passage through the alimentary canal when a person has ingested roti and dal as part of his repast.

A.1. The following are the changes:

• The teeth in the mouth masticate the food substances, wherein the carbs in the food are digested through the activeness of the enzyme secreted by the salivary gland – salivary amylase
• The food at this stage is partially digested and reaches the stomach. Here it is treated with acidic HCl. The proteins in the food are digested through the proteolytic enzymes.
• The gall float secrets the bile to digest the lipids present in the food
• The semi-digested nutrient is finally digested in the duodenum of the minor intestine by the action of digestive enzymes in the pancreatic and abdominal juices.
• The small-scale intestine thus absorbs the disintegrated food in the form of glycerol, amino acids, starch, etc after digestion
• The food that is not digested in finally eliminated from the system through the anus.

Q.2. Write the mechanism of assimilation.

A.2. Information technology is the phenomenon through, which the end products of digestion pass via the intestinal mucosa into the lymph or blood, which is carried out through active, passive or facilitated transport ways. Through elementary diffusion, little quantities of monosaccharides such as amino acids, glucose and few electrolytes such equally chloride ions are absorbed. The concentration gradients decide the passage of these substances into the blood. But amino acids and glucose are absorbed with the aid of carrier proteins and is referred to equally facilitated transport. Water transport is dependant on the osmotic gradient. Active transport requires energy as information technology takes place confronting the concentration gradient. Through this mechanism, several monosaccharides such equally glucose, nutrients such as amino acids, electrolytes such as Na+ are absorbed into the claret.

Q.iii. What is the significance of hepato-pancreatic circuitous in digesting protein, sugar and fat components of food?

A.3. The pancreatic and bile duct secretes bile and pancreatic juices into the duodenum through the common duct – the hepato-pancreatic duct, which is shielded past a sphincter of Oddi. The pancreatic juice includes inactive enzymes –

• Chymotrypsinogen
• Trypsinogen
• Procarboxypeptidases
• Lipases
• Amylases
• Nucleases

The outcome of hepato-pancreatic secretion on the digestion of fats, proteins, and carbohydrates are as follows:

• Hydrolysis of carbohydrates in the chyme into disaccharides by pancreatic amylase
• Fats are disintegrated into diglycerides and monoglycerides by lipases along with the aid of bile
• Proteolytic enzymes of the pancreatic juice act upon the proteins in the chyme that reach the intestine to produce proteases.

Q.4. How does digestion occur in the buccal cavity? Explain with the arrangement of teeth.

A.4. The buccal cavity has 2 important functions –

• Masticates food
• Facilitates swallowing

The tongue and the teeth with assistance of saliva, masticate and alloy the food completely. The mucus present in saliva helps in lubricating and holding the masticated food particles into a bolus. The bolus is further passed into the throat and downwardly the oesophagus past deglutition or swallowing. The bolus moves through successive waves of contractions of the muscles downwardly the oesophagus, this motility is known as peristalsis.

Q.5. Define the following terms – Bolus, Mastication and Digestive Enzymes.

A.5.

Bolus – It is round, ball-shaped and a mixture of a chewed nutrient formed by the combination of food and saliva in the oral cavity or gastrointestinal tract.

Mastication – It is the act of chewing the food. In this process, the food particles are broken downwardly into smaller and soluble particles for ease of swallowing. This procedure occurs inside the oral cavity, including the teeth, natural language and the cheek.

Digestive Enzyme – They are the group of enzymes found in the digestive tracts and are secreted predominantly by the pancreas and other organs including the salivary gland, stomach and in the lining of the gastrointestinal tract. Digestive Enzymes play a key role in the process of chemical digestion.

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