Q: Question 8Write the correct word for the items (i) to (viii).(i) A predator:GRIET\boxed{\text{GRIET}} \quadGRIET ...............(ii) Deficiency of Folic acid (B9) produces:MIAAAEN\boxed{\text{MIAAAEN}} \quadMIAAAEN ...............(iii) A digestive enzyme:ENPISP\boxed{\text{ENPISP}} \quadENPISP ...............(iv) A part of tooth:TEEDINN\boxed{\text{TEEDINN}} \quadTEEDINN ...............(v) Fatty acids are absorbed into:TACLELAS\boxed{\text{TACLELAS}} \quadTACLELAS ...............(vi) Maltase acts on:LESOMAT\boxed{\text{LESOMAT}} \quadLESOMAT ...............(vii) Excess amino acids are broken down in:RIVEL\boxed{\text{RIVEL}} \quadRIVEL ...............(viii) An enzyme which digest starch:YEALMAS\boxed{\text{YEALMAS}} \quadYEALMAS ...............

(i) A predator:GRIET\boxed{\text{GRIET}} \quadGRIET TIGER(ii) Deficiency of Folic acid (B9) produces:MIAAAEN\boxed{\text{MIAAAEN}} \quadMIAAAEN ANAEMIA(iii) A digestive enzyme:ENPISP\boxed{\text{ENPISP}} \quadENPISP PEPSIN(iv) A part of tooth:TEEDINN\boxed{\text{TEEDINN}} \quadTEEDINN DENTINE(v) Fatty acids are absorbed into:TACLELAS\boxed{\text{TACLELAS}} \quadTACLELAS LACTEALS(vi) Maltase acts on:LESOMAT\boxed{\text{LESOMAT}} \quadLESOMAT MALTOSE(vii) Excess amino acids are broken down in:RIVEL\boxed{\text{RIVEL}} \quadRIVEL LIVER(viii) An enzyme which digest starch:YEALMAS\boxed{\text{YEALMAS}} \quadYEALMAS AMYLASE

Question 1

Question 2Why is the small intestine the most important organ of the digestive system?

Accepted Answer

The small intestine serves two important functions of digestion and absorption. In the duodenum, it receives two digestive juices:The bileThe pancreatic juiceBoth the juices virtually complete the process of digestion of proteins, starch, carbohydrates etc. Once the food is broken down, the small intestine is responsible to absorb simple particles such as amino acids, glucose etc.

Question 2

Question 5You have been supplied with a sample of food. How will you perform tests for the presence of starch and proteins in it?

Accepted Answer

The following tests can be carried out:Test for starch:Aim — To detect the presence of starch in the sampleProcedure and Inference —Add some starch powder to a test tube containing water, shake well. Boil well to make a solution.Add some drops of iodine solutions when the solution cools down.Iodine solution can be prepared by dissolving 1g iodine with 1g potassium iodide in 100ml of distilled water, dilute this solution before using.The solution in the test tube would turn blur-black indicating the presence of starch.Test for proteins:Aim — To detect the presence of proteins in the given sampleProcedure and Inference—In a test tube add a few pieces of the sample (hard-boiled egg)Add a few drops of dilute nitric acid so as to seal the foodGently heat the test tube, rinsing off the acid with water, to this add ammonium hydroxideObserve the changes – from the initial white, color changes to yellowAfter adding ammonium hydroxide – the color changes from yellow to orange.

Question 3

Question 1(ix)Which of the following enzymes is not found in pancreatic juice ?SucraseTrypsinogenAmylopsinSteapsin

Accepted Answer

SucraseReason — Sucrase is present in intestinal juice.

Question 4

Question 1(x)The process of conversion of excess glucose into glycogen is termed as :GlycolysisGlycogenesisGlycogenolysisDefaecation

Accepted Answer

GlycogenesisReason — The excess glucose present in our body is converted into glycogen by liver.

Question 5

Question 1(xi)Name the salivary gland P, Q and R based on their location given below:Salivary glandLocationPBeneath the earsQBelow the tongueRBeneath the lower jawP — Parotid, Q — Submandibular, R — SublingualP — Sublingual, Q — Parotid, R — SubmandibularP — Submandibular, Q — Sublingual, R — ParotidP — Submandibular, Q — Parotid, R — Sublingual

Accepted Answer

P — Parotid, Q — Sublingual, R — SubmandibularReason — The saliva is secreted by three pairs of salivary glands :parotid glands located just in front of and beneath each ear,submandibular glands lying close to the inner side of the lower jaw on each side,sublingual glands below the tongue.

Question 6

Question 1(xii)A biology teacher asked her students to give two examples of enzymes which act on different forms of carbohydrates.Nishtha said: Amylopsin and invertase.Ankur said: Steapsin and Maltase.Prakriti said: Ptyalin and Amylopsin.Aakash said: Maltase and Erepsin.Who were correct?Ankur and AakashNishtha and PrakritiNishtha and AnkurNishtha and Aakash

Accepted Answer

Nishtha and PrakritiReasonStudentEnzymes NamedSubstrate TypeResultNishthaAmylopsin acts on starchInvertase acts on sucroseBoth are carbohydratesCorrectAnkurSteapsin acts on fatsMaltase acts on Maltose (carbohydrate)One enzyme does not act on carbohydrateIncorrectPrakritiPtyalin (salivary amylase) acts on starchAmylopsin acts on starchBoth are carbohydratesCorrectAakashMaltase acts on Maltose (carbohydrate)Erepsin acts on ProteinsOne enzyme does not act on carbohydrateIncorrectTherefore, only Nishtha and Prakriti supplied two enzymes that each act on some form of carbohydrate.

Question 7

Question 3Study the diagram given below and then answer the questions that follow:(a) Name the parts labeled 1, 2, 3, 4, 5 and 6.(b) Identify the tooth and give a reason to support your answer.(c) Describe the structure of the part labeled '3'.(d) Give the total number of the type of tooth mentioned in '1' above, in the mouth of an adult and state its function.

Accepted Answer

(a) The parts are-1 → Enamel2 → Dentine3 → Pulp4 → Gum5 → Crown6 → Cement(b) The type of teeth shown in the given figure has only one root. Hence it is a canine or incisor that is used to bite or pierce.(c) The part labelled '3'(Pulp) is a soft connective tissue present in the pulp cavity of the tooth. It consists of blood capillaries, lymph vessels and nerve fibres. From the crown of the tooth, the pulp opens through the pulp cavity at the base of the root.(d) The type of teeth mentioned in the figure and its function are as follows:Type of teethNumber of teethFunctionIncisors8Used to cut and biteCanines4Used to tear and hold foodPremolars8Used to grind and crush foodMolars12Used to grind and crush food

Question 8

Question 4Study the following dental formula and then answer the questions that follow:i34c00pm01m11i\dfrac{3}{4} \enspace c\dfrac{0}{0} \enspace pm\dfrac{0}{1} \enspace m\dfrac{1}{1}i43​c00​pm10​m11​(a) What is the total number of teeth in the (i) upper jaw and (ii) lower jaw?(b) State the total number of teeth present in the dentition.(c) Give the dental formula of an adult human being.

Accepted Answer

(a) The total number of teeth in the upper jaw are 8 and lower jaw are 12.(b) The total number of teeth present in the given dentition are 20 teeth.(c) The dental formula of an adult is as follows:Human adult: 2,1,2,32,1,2,3=32\dfrac{2, 1, 2, 3}{2, 1, 2, 3} = 322,1,2,32,1,2,3​=32 (permanent teeth with 4 wisdom teeth added)

Question 9

Question 6Draw a neat diagram of the "Microscopic Structure of an intestinal villus" and label the parts given below :EpitheliumCapillariesLactealsAnswer the following questions :(a) What is the advantage of having a large number of villi on the inner surface of small intestine ?(b) Write the important role of lacteals.(c) Name the juice secreted from the glandular cells of small intestine.(d) Name the specific secretions of:Salivary glandStomachLiverPancreas

Accepted Answer

Below is the labelled diagram of the "Microscopic Structure of an intestinal villus":(a) A large number of villi enormously increase the inner surface area of the small intestine which facilitates the absorption of digested food.(b) The fatty acids and glycerol are absorbed into the lacteals to enter the lymphatic system which forms a network all over the body to ultimately empty its contents into the blood stream.(c) Intestinal juice(d)Salivary gland - Saliva (amylase)Stomach - Gastric juiceLiver - BilePancreas - Pancreatic juice

Question 10

Question 8Write the correct word for the items (i) to (viii).(i) A predator:GRIET\boxed{	ext{GRIET}} \quadGRIET​ ...............(ii) Deficiency of Folic acid (B9) produces:MIAAAEN\boxed{	ext{MIAAAEN}} \quadMIAAAEN​ ...............(iii) A digestive enzyme:ENPISP\boxed{	ext{ENPISP}} \quadENPISP​ ...............(iv) A part of tooth:TEEDINN\boxed{	ext{TEEDINN}} \quadTEEDINN​ ...............(v) Fatty acids are absorbed into:TACLELAS\boxed{	ext{TACLELAS}} \quadTACLELAS​ ...............(vi) Maltase acts on:LESOMAT\boxed{	ext{LESOMAT}} \quadLESOMAT​ ...............(vii) Excess amino acids are broken down in:RIVEL\boxed{	ext{RIVEL}} \quadRIVEL​ ...............(viii) An enzyme which digest starch:YEALMAS\boxed{	ext{YEALMAS}} \quadYEALMAS​ ...............

Accepted Answer

(i) A predator:GRIET\boxed{	ext{GRIET}} \quadGRIET​ TIGER(ii) Deficiency of Folic acid (B9) produces:MIAAAEN\boxed{	ext{MIAAAEN}} \quadMIAAAEN​ ANAEMIA(iii) A digestive enzyme:ENPISP\boxed{	ext{ENPISP}} \quadENPISP​ PEPSIN(iv) A part of tooth:TEEDINN\boxed{	ext{TEEDINN}} \quadTEEDINN​ DENTINE(v) Fatty acids are absorbed into:TACLELAS\boxed{	ext{TACLELAS}} \quadTACLELAS​ LACTEALS(vi) Maltase acts on:LESOMAT\boxed{	ext{LESOMAT}} \quadLESOMAT​ MALTOSE(vii) Excess amino acids are broken down in:RIVEL\boxed{	ext{RIVEL}} \quadRIVEL​ LIVER(viii) An enzyme which digest starch:YEALMAS\boxed{	ext{YEALMAS}} \quadYEALMAS​ AMYLASE

Question 11

Question 1What is the dental formula of a normal human adult?

Accepted Answer

Human adult: 2,1,2,32,1,2,3=32\dfrac{2, 1, 2, 3}{2, 1, 2, 3} = 322,1,2,32,1,2,3​=32 (permanent teeth with 4 wisdom teeth added)

Question 12

Question 7Choose the odd one out and write the category of the remaining terms :Pepsin, Trypsin, Steapsin, ErepsinLactase, Peptidase, Invertase, MaltaseGlucose, Fructose, Galactose, StarchIleum, Colon, Duodenum, JejunumPalate, Crown, Root, Neck

Accepted Answer

Steapsin is odd one out. Remaining terms (Pepsin, Trypsin and Erepsin) are protein digesting enzymes.Peptidase is odd one out. Lactase, Invertase and Maltase are sugar digesting enzymes.Starch is odd one out. Glucose, Fructose and Galactose are simple sugar.Colon is odd one out. Ileum, Duodenum and Jejunum are parts of small intestine.Palate is odd one out. Crown, Root and Neck are parts of teeth.

Digestive System

Long Answer Type

Multiple Choice Type

Structured Application Skill Type

Very Short Answer Type