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Two Marks Questions1. Arrange the following parts in correct

sequence. Buccal cavity, pharynx, mouth, smallintestine, stomach, rectum, largeintestine, anus, oesophagus.

A: Mouth Buccal cavity Pharynx Oesophagous Stomach Smallintestine Large intestine Rectum Anus

2. Write the chemical names of fat solublevitamins?

A: A, D, E, K are the fat soluble vitamins.A - Retinol D - CalciferolE - TocoferolK - Phylloquinone

3. What is meant by malnutrition? How manytypes are there?

A: Eating of food that does not have one ormore than one nutrients in required amountis called as malnutrition. It is three types.They arei) Calorie malnutrition ii) Protein malnutritioniii) Protein and Calorie malnutrition

4. Role of Acid (HCl) in stomach?A: Acid present in gastric juice helps in killing

bacteria, protein denaturation, provideacidic medium, converts pepsinogen intopepsin.

5. What is emulsification? Which helps in thisprocess?

A: Conversion of fat into small globule likeform is known as emulsification. It occurswith the help of bile juice secreted by liver.

6. What is the role of saliva in the digestion offood?

A: H Ptyalin (salivary amylase) present insaliva converts starch into maltosesugars.

H Lysozyme enzyme present in saliva killsbacteria present in food.

H Lubricates food for easy swallowing.7. Protein calorie malnutrification causes what

type of disease? What are the symptomesof that disease?

A: Marasmus caused due to protein caloriemalnutrition.Symptoms: Lean and weak, swellinglimbs, prominent ribs, less developedmuscles.

8. Name of the digestive juice secreted by thepancrease? Write what enzymes arepresent in them.

A: Pancrease secretes pancreatic juice. Itcontains amylase, trypsin, lipase enzymes,which acts respectively on carbohydrates,proteins, fats.

9. Write the end products of carbohydrates,proteins, fats, If they are digestedcompletely?

A: Carbohydrates GlucoseProteins Amino acidsLipids/fats Glycerol and fatty acids.

10. Why do you think that carbohydrates arenot digested in the stomach?

A: Carbohydrates digesting enzymes areabsent in Gastric juice. Hencecarbohydrates are not digested instomach.

K. NagarajuSubject Expert

Writer

1. Which cell organelle converts light energyinto chemical energy? How it is suited tothat activity?

A: H Chloroplast converts light energy intochemical energy.

H Chlorophyll and others accessorypigment molecules present in thethylakoid membranes helps in thecapturing the solar energy and initiatesdifferent light dependent activities.

H Stroma is the fluid filled portion ofchloroplast contains all enzymesneeded for dark reactions/ carbonfixation of photosynthesis.

2. Draw a neat labelled diagram of chloroplastfound in leaf and its role in photosynthesis?

A: During photosynthesis several eventsoccur in the chloroplast like.H Conversion of light energy into chemical

energy.H Splitting of water molecule.H Reduction of carbondioxide to carbohy-

drates.3. How is the small intestine designed to

absorb digested food? Explain.A: H The small intestine is the longest part of

the alimentary canal.H Digestion completed in small intestine

with the help of bile juice, pancreaticjuice and intestinal juice.

H The inner surface of small intestine hasmillions of tiny finger like projectionscalled villi.

H Villi increases absorption surface area ofsmall intestine large surface area ofsmall intestine helps in the rapidabsorption of digested food.

4. Explain the process of photosynthesis withthe help of a flow chart?

Light6 CO2 + 12 H2O C6H12O6 +

Chlorophyll 6 H2O + 6 O2

A: H Photosynthesis is a photochemical reac-tion during which CO2 and water com-bines in the presence of sunlight andchlorophyll to prepare glucose. Oxygenand water are also formed as by prod-ucts.

H Photosynthesis occurs in two phasesi) Light reaction ii) Dark reaction

H The following events occur in lightreactiona) Activation of chlorophyllb) Splitting of water molecule (photolysis)c) Formation of O2, ATP, NADPH

H In dark reaction, CO2 is reduced toglucose through a series of reactions.

5. From the following list prepare correctmatch with vitamins and respectivedeficiency disease. Retinol, fertility disor-ders, pantothenic acid, calciferol, burningfeet, night blindness, rickets, tocoferol.

A: Retinol - Night blindnessTocoferol - Fertility disordersPantothenic acid - Burning feetCalciferol - Rickets

6. What are the digestive juices (withenzymes) secreted by the salivary, liver,pancrease, gastric glands.

Four Marks Questions

1. What are the essential factors required forphotosynthesis?

A: Carbondioxide, Water, Sunlight,Chlorophyll

2. What are the end products of photosyn-thesis?

A: Glucose, Oxygen, Water3. Write the chemical equation of photosyn-

thesis?Light

A: 6 CO2 + 12 H2O C6H12O6 +Chlorophyll

6 H2O + 6 O2

4. What is Grana?A: The stacked Sac like structures formed by

the third layer of chloroplast is calledGrana.

5. What is stroma?A: The fluid filled portion of chloroplast is

called stroma.6. What are the end products of light

reaction?A: O2, ATP, NADPH7. Define photolysis.A: Splitting of water molecule by light

activated chlorophyll is known asphotolysis.

8. ATP - Adenosine triphosphate NADPH - ?

A: Nicotinamide adenosine dinucleotidehydrogen phosphate

9. Kwashiorkor - Protein deficiencyMarasmus - ?

A: Protein and calorie deficiency10. Arrange the following in correct sequence

Defecation, Digestion, Ingestion,Absorption.

A: Ingestion, Digestion, Absorption,Defecation

One Mark Questions

Who Discovered Oxygen?

1. Who proposed simplified chemicalequation for photosynthesis?

A: C B Van Neil2. Which reagent is used to identify the

presence of starch in leaves?A: Iodine solution3. In Iodine test, the starch turns into which

colour?A: Blue - black colour4. Who discovered Oxygen?A: Joseph Priestly5. Who coin the term oxygen?A: Lavoisier6. Name of the solution used in bottle in

Mohl's half leaf experiment?A: KOH (Potassium Hydroxide)7. Use of KOH in Mohl's half leaf experiment?A: To absorb CO2 present in the bottle.

8. Maximum rate of photosynthesis occurs in...... light rays.

A: Blue and Red9. Who discovered photolysis of water?A: Robert hill10. Who discovered Chlorophyll?A: Pelletier and Caventous11. Chlorophyll containing organelles are

known as ...A: Chloroplast12. Hemoglobin - Iron : Chlorophyll - ?A: Magnesium13. Chlorophyll a - Blue - green colour

Chlorophyll b - ?A: Yellow - green colour14. Light dependent reaction -

Photochemical phase Light independent reaction - ?

A: Biosynthetic phase

12 Mark Questions

Nutrition - Food Supplying System

Photosynthesis

Light reaction Dark reaction

Activation of chlorophyll CO2 + RUBP

Photolysis

Formation of O2 Hexose sugar

ATP, NADPH PGA

used in dark reaction

Glucose

}

Membrane

Grana

Stoma

Starch

Loop of DNA

Target-2020

TenthGeneral Science

100100

Joseph Priestly

A: Name of Name of Enzymes the gland the dige- present in

stive juice them

Salivary Saliva Ptyalinglands

Liver Bile juice No enzymes

Pancreas Pancreatic Amylase, juice Trypsin,

Lipase

Gastric Gastric Pepsinglands juice