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Download CLASS XI (DIG AND BREATH)
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Class - XI TEST ID BIO001 ANSWER KEY BIOLOGY PART MOCK TEST - 1 Question 1 : Suggested Marks Question 1 :Which is the largest gland of the body? Suggested Answers Part Answer1 Liver is the largest gland of the human body. Question 2 : Suggested Marks Question 2 :What is carbamino-haemoglobin? Suggested Answers Part Answer1 Carbamino-haemoglobin is formed by combination of CO2 with amino groups of globin protein of haemoglobin of RBCs. About 23% of CO2 is transported from body cells to lung alveoli in this form. Question 3 : Question 3 :Mention any two functions of hydrochloric acid in gastric juice? Suggested Answers Part Answer1 Hydrocloric acid activates the pepsinogen and prorennin and provides acidic medium for action of pepsin. Question 4 : Suggested Marks Question 4 :How is fat digested in the humans? Suggested Answers 1 of 6 Powered by Part Answer1 No digestion of fat occurs in buccal cavity while very little digestion of fat occurs in stomach.About two third of fat is step-wise digested by pancreatic lipase enzyme in samll intestine while remaining fat is digested by intestinal lipase . But digestion of fat is never completed. Part Answer2 Lipase Lipase Lipase Triglyceride Diglyceride Monoglyceride Glycerol+Fatty Acid + + Fatty Acid Fatty Acid Question 5 : Suggested Marks Question 5 :What is the role of carbonic anhydrase? Where is it operative? Suggested Answers Part Answer1 Carbonic anhydrase operates inside the RBCs of blood. It favours the dissolution of CO2 in water to form carbonic acid. Question 6 : Suggested Marks Question 6 :Name the organs which secrete carboxypeptidases and aminopeptidases respectively. Give the functions performed by these enzymes. Suggested Answers Part Answer1 Carboxypeptidases is secreted by pancreas. It separates amino acids from C-terminus of a polypeptide. Part Answer2 Aminopeptidase is secreated by intestinal glands. It separates amino acids from N-terminus of a polypeptide. Question 7 : Suggested Marks Question 7 :How are respiratory gases transported in the human blood? Suggested Answers 2 of 6 Powered by Part Answer1 Respiratory gases are transported in the human blood as followsBlood Transports 1 to 3 % of O2 in dissolved form in the blood plasma and 97% to 99% of O2 as oxyhaemoglobin formed by combination of oxygen and haemoglobin of RBCs. Part Answer2 Blood transports 7% of CO2 as carbonic acid, 70 % of CO2 as sodium and potassium bicarbonates and 23% of CO2 as carbaminohaemoglobin. Question 8 : Suggested Marks Question 8 :What is biological significance of E.coli in the alimentary canal? Suggested Answers Part Answer1 These bacterria synthesize certain B-complex vitamins , example B1, B2, Biotin and Folic acid and Vitamin-K. Question 9 : Suggested Marks Question 9 :Where is carbonic anhydrase in the transport of gases? Suggested Answers Part Answer1 Carbonic anhydrase is located inside the RBCs.It favours the dissolution of CO2 in water to form carbonic acid. Question 10 : Question 10 :Explain the term thecodont and diphyodont. Suggested Answers Part Answer1 Thecodont is the condition in which teeth are present in the sockets called alveloli, of the jaw bones.Such type of teeth are found in mammals and crocodiles. Part Answer2 Diphyodont is the condition in which teeth appear in two setsMilk Teeth and Permanent Teeth. Milk Teeth are weaker, temporary and start erupting after some period of birth and are replaced by permanent teeth. In human being, there are 20 teeth in milk set while 32 teeth in permanent set of teeth. 3 of 6 Powered by Item Id: -1066505407 Suggested Marks Question 11 :What are major transport mechanisms for CO2? Explain. Suggested Answers Part Answer1 Nearly 20 to 25% of CO2 is transported by RBCs whereas 70% of it is carried as bicarbonate.About 7% of CO2 is carried in a dissolved state through plasma. Part Answer2 CO2 is carried by haemoglobin as carbamino-haemoglobin.This binding is related to the partial pressure of CO2.70% of CO2 is converted into bicarbonate by enzyme carbonic anhydrase present in RBCs with very high concentration and also in in plasma with minute quantity. Part Answer3 This enzymer facilitates the reaction in both directions.At the tissue site where partial pressure of CO2 is high due to catabolism, CO2 diffuses into blood (RBCs and plasma and forms HCO3- and H+.At the alvelolar site where direction leading to the formation of CO2 and H2O. Question 12 : Suggested Marks Question 12 :Describe the digestive role of chymotrypsin.Which two other digestive enzymes of the same category are secreted by its source gland? Suggested Answers Part Answer1 Chymotrypsin is a proteolytic enzyme present in pancreatic juice of pancreas. It hydrolyses the proteases and peptones into peptides. Part Answer2 Chymptrypsin Peptones and Proteases Peptides Part Answer3 Other proteolytic enzymes of pancreatic juice are- Trypsin and Carboxypeptidase. Question 13 : Suggested Marks Question 13 :Define vital capacity.What is its significance? Suggested Answers 4 of 6 Powered by Part Answer1 Vital capacity is defined as the maximum volume of air a person can breathe in after a forced expiration or the maximum volume of air a person can breathe out after a forced inspiration. Part Answer2 It represents the maximum amount of air one can renew in the respiratory system in a single respiration.Thus, greater the vital capacity more is the energy available to the body. Question 14 : Suggested Marks Question 14 :Explain the coagulation of milk in the alimentary canal. Suggested Answers Part Answer1 Milk is coagulated in stomach by Rennin enzyme in the following way- Part Answer2 Question 15 : Question 15 :Explain the process of inspiration under normal conditions. Suggested Answers Part Answer1 Inspiration is a process by which fresh air enters the lungs. The diaphragm, intercostal muscles of the diaphragm and abdominal muscles play an important role. 5 of 6 Powered by Part Answer2 The muscles of the diaphragm and external intercostal muscles are principle muscles of inspiration.Volume of thoracic cavity increases by contraction of diaphragm and external muscles. Part Answer3 During inspiration relaxation of abdominal muscles also occurs which allow compression of the abdominal organs by diaphragm. Part Answer4 Thus overall volume of the thoracic cavity increases and as a result there is a decrease of the air pressure in the lungs. The greater pressure outside the body now causes air to flow rapidly into the lungs. Part Answer5 The sequence of air flow isExternal Nares → Nasal Chambers → Internal Nares → Pharynx → Glottis → Larynx → Trachea → Bronchi → Bronchioles 6 of 6 Powered by
