CBSE Class 11 Biology Digestion and Absorption Assignments

Solve the MCQ questions below

Question. Assertion :- Food is one of the basic requirement of all living organisms.
Reason :- Food provides energy and organic materials for growth and repair of tissue.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- The digestion is an essential events before absorption of food substances.
Reason :- This is process of conversion of complex food substance into simple absorbable form.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Human has thecodont teeth.
Reason :- All teeth are embedded in the socket of jaw bone.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Enamel is the hardest subtance of human body.
Reason :- Enamel is originated from ectodermal ameloblast cells.
(a) A
(b) B
(c) C
(d) D
Answer: B

Question. Assertion :- Most part of pharynx is lined by non-keratinised squamous stratified epithelium.
Reason :- The pharynx serves as a common passage for food and air.
(a) A
(b) B
(c) C
(d) D
Answer: B

Question. Assertion :- A cartilaginous flap called epiglottis prevents the entery of food in to gullet.
Reason :- It's movement controlled by hormonal reflex.
(a) A
(b) B
(c) C
(d) D
Answer: D

Question. Assertion :- The sub-lingual salivary gland situated just outside the buccal cavity.
Reason :- These glands secrete salivary juice into the buccal cavity.
(a) A
(b) B
(c) C
(d) D
Answer: B

Question. Assertion :- The hepatic cells are the structural and functional unit of liver.
Reason :- The bile secreted by the hepatic cells and collected by hepatic duct.
(a) A
(b) B
(c) C
(d) D
Answer: D

Question. Assertion :- Buccal cavity performs two major functions, mastication and fascilitation of swallowing.
Reason :- Mucus in saliva helps in lubricating and adhering the masticaticated food particles in a bolus.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Saliva also contains antibacterial properties.
Reason :- It contains electrolytes (\( \text{Na}^+ \), \( \text{K}^+ \) \( \text{Cl}^– \), \( \text{HCO}_3^– \), thiocynate (\( \text{SCN}^– \)), Lysozyme.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- About 70% of starch is hydrolysed in buccal cavity
Reason :- Salivary amylase is a strongest \( \alpha \)-amylase at which acts on pH 1.8.
(a) A
(b) B
(c) C
(d) D
Answer: D

Question. Assertion :- The stomach stores food for 4-5 hours.
Reason :- The food mixed thoroughly with acidic gastric juice of the stomach by the churing movement.
(a) A
(b) B
(c) C
(d) D
Answer: B

Question. Assertion :- A small amount of lipid can digest in stomach.
Reason :- Small amounts of lipase are also secreted by gastric glands.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- HCl provides the acidic pH(pH 1.8) optimal for pepsin.
Reason :- Oxyntic cells of gastric glands secrets highly concentrated hydrochloric acid.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Bile juice play a very important role in digestion of lipid.
Reason :- Bile contains strongest lipase whcih is activated by bile salts.
(a) A
(b) B
(c) C
(d) D
Answer: C

Question. Assertion :- Proteoses and peptones are partially hydrolysed proteins which are formed by action of pepsin upon protein.
Reason :- Pepsin is an endopeptidase, which acts on specific internal peptide bond of denatured protein.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- The faeces enters into the caecum of the large intestine through ileo-caecal valve.
Reason :- Ileo-caecal valve prevents the back flow of the faecal matter.
(a) A
(b) B
(c) C
(d) D
Answer: B

Question. Assertion :- The sight, smell and for the presence of food in the oral cavity can stimulate the secretion of saliva as well as gastric juice.
Reason :- The secretion of saliva and gastric juice is controlled by reflex action.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Small amount of monosaccharide like glucose, amino acids and some of electrolytes like chloride ions are generally absorbed by simple diffusion.
Reason :- The passage of these substances into the blood depends upon the concentration gradients.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Various nutrients like amino acids, monosaccharides like glucose, electrolytes like \( \text{Na}^+ \) are absorbed in to blood by active transport.
Reason :- Active transport occurs against the concentration gradient
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Maximum absorption occurs in the small intestine.
Reason :- Small intestine is the longest part of gut, here complex biomolecule’s are changed in absorbable forms.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Rugae appears in mucosa of stomach.
Reason :- Mucosa in empty stomach shows small rough appearance.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Parietal cells secrete Hydrogen ions (\( \text{H}^+ \)) and chloride ions (\( \text{Cl}^– \)) separately into the stomach lumen the net effect is secretion of hydrochloric acid (HCl).
Reason :- Proton pumps powered by \( \text{H}^+/\text{K}^+ \) ATPase actively transport \( \text{H}^+ \) into the lumen while bringing potassium ions (\( \text{K}^+ \)) into the cell.
(a) A
(b) B
(c) C
(d) D
Answer: B

Question. Assertion :- Excess intake of saturated fats, often leads to cardiac disorder.
Reason :- Butter, Ghee, vegetable oils, red meat, eggs, etc. often leads to hypercholesterolemia.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Very high intakes of minerals and fat soluble vitamins (obtained from food sources alone) can be toxic.
Reason :- They are stored in the body.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Rate of absorption of galactose is highest.
Reason :- Galactose is actively consumed during glycolysis.
(a) A
(b) B
(c) C
(d) D
Answer: C

Question. Assertion :- The product of fat digestion - monoglyceride, fatty acids and glycerols are first absorbed by enterocyte and reconstructed to triglycerides.
Reason :- These products are water solube can be easily transported through blood and lymphatic circulation.
(a) A
(b) B
(c) C
(d) D
Answer: C

Question. Assertion :- Chylomicrons are water soluble, and protein coated droplets.
Reason :- Chylomicrons are synthesised in the lymph capillaries.
(a) A
(b) B
(c) C
(d) D
Answer: D

Question. Assertion :- In the large intestine mainly water is absorbed.
Reason :- It is lined with simple squamous epithelium.
(a) A
(b) B
(c) C
(d) D
Answer: C

Question. Assertion :- Absorption of vitamin \( \text{B}_{12} \) (Cobalamine) in human required a glycoprotein, called Castles lntrinsic factor.
Reason :- Vitamin \( \text{B}_{12} \) can not be absorbed directly.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Failure of absorption of cobalamine can causes pernicious anaemia
Reason :- It is essential for RBC maturation.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Water, minerals and vitamins can be absorbed directly.
Reason :- These can be assimilated as such.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Starch, present in plants, needs its digestion.
Reason :- It is a complex substances that can not be absorbed as such.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- The structural simplification of vitamins and minerals is brought by the action of hydrolytic enzyme vitaminase.
Reason :- Vitamins can not be assimilated by all cells.
(a) A
(b) B
(c) C
(d) D
Answer: D

Question. Assertion :- The various part of alimentary canal can produces various hydrolytic enzymes.
Reason :- Alimentary canal is associated with digestion and absorption of nutrients.
(a) A
(b) B
(c) C
(d) D
Answer: B

Question. Assertion :- Salivary gland and pancreas can be considered as accessory digestive glands.
Reason :- These glands are presence outside the alimentary canal and help in digestion by pouring their secretions into the alimentary canal.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- The digestive organs are concerned in the mastication, deglutition, digestion and absorption of food and elimination of unabsorbed constituents of food.
Reason :- Digestive organs are resistant to action of digestive enzymes.
(a) A
(b) B
(c) C
(d) D
Answer: B

Question. Assertion :- Food is one of the basic requirements of all living organism.
Reason :- The major component of our food are vitamines and minerals.
(a) A
(b) B
(c) C
(d) D
Answer: C

Question. Assertion :- Biomacromolecules in food can be utilised by out body in their original form
Reason :- Our alimentany canal absorbed these molecules in as such form.
(a) A
(b) B
(c) C
(d) D
Answer: D

Question. Assertion :- Human have heterodont dentition
Reason :- In human four different types of teeth are present.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- The upper surface of the tongue has small projections called papillae.
Reason :- All papillae bear taste buds.
(a) A
(b) B
(c) C
(d) D
Answer: C

Question. Assertion :- The opening of the stomach into the duodenum is guarded by the pyloric sphincter.
Reason :- Pyloric sphincter is a weak sphincter than gastro-oesophageal sphincter.
(a) A
(b) B
(c) C
(d) D
Answer: C

Question. Assertion :- Caecum is a small blind sac which is a vestigial organ.
Reason :- Ileum open into small intestine.
(a) A
(b) B
(c) C
(d) D
Answer: D

Question. Assertion :- The wall of alimentary canal from oesophagus to rectum possesses four layers.
Reason :- Muscularis layer is formed by smooth muscles.
(a) A
(b) B
(c) C
(d) D
Answer: B

Question. Assertion :- The sub mucosal layer is formed by loose connective tissue
Reason :- Sub mucosal layer is without nerves, blood and lymph vessels.
(a) A
(b) B
(c) C
(d) D
Answer: C

Question. Assertion :- Liver is largest exocrine gland in human body.
Reason :- It is located in abdominal cavity.
(a) A
(b) B
(c) C
(d) D
Answer: B

Question. Assertion :- Saliva is mainly produced by three salivary gland.
Reason :- Saliva help in digestion of proteins.
(a) A
(b) B
(c) C
(d) D
Answer: D

Question. Assertion :- The hapatic lobules are structural and functional unit of liver.
Reason :- Bile juice secreted by hepatocytes.
(a) A
(b) B
(c) C
(d) D
Answer: B

Question. Assertion :- The chemical process of digestion is initiated in the oral cavity.
Reason :- Salivary amylase present in saliva.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- The exocrine portion of pancreas secretes an alkaline juice.
Reason :- Endocrine portion of pancreas secretes hormones.
(a) A
(b) B
(c) C
(d) D
Answer: B

Question. Assertion :- In buccal cavity bacteria can be killed.
Reason :- Lysozyme present in saliva.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- HCl in stomach help in digestion of proteins.
Reason :- At acidic pH proten denatured and HCl causes conversion of pepsinogen into pepsin.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- Damage of oryntic cells results into pernicious anaemia.
Reason :- Castle intrinsic fuctor not secreted.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- No siginficant digestive activity occurs in the large intestine.
Reason :- In mucosa layes of large intestine digestive enzyme secreating cells are absent.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- The activities of gastro-intestinal tract are under neural control only.
Reason :- Hormonal control activities of gastrointestinal tract is ineffective.
(a) A
(b) B
(c) C
(d) D
Answer: D

Question. Assertion :- Secretion of Brunner's glands help is protection of intestinal mucosa.
Reason :- Its secretion is alkaline in nature so neutralise the acidic chyme and provid alkaline medium.
(a) A
(b) B
(c) C
(d) D
Answer: A

Question. Assertion :- The abnormal frequency of bowel movement and decrease liquidity of faecal discharge is known as diarrhoea.
Reason :- It is the ejection of stomach contents through anus.
(a) A
(b) B
(c) C
(d) D
Answer: D

Question. Assertion :- Hormonal control of secretion of digestive juices is carried out by local hormones produced by mucosa of oesophagus and large intestine.
Reason :- Gastric juice is complete digestive juice.
(a) A
(b) B
(c) C
(d) D
Answer: D