Class 10 Science: CBSE (Official) Sample Question Paper (2024-25) | CBSE Sample Papers For Class 10 PDF Download

 Page 1


SCIENCE SQP (2024-25) 
CLASS X  
 (Science 086) 
Max. Marks: 80                                                                      Time Allowed: 3 hours  
General Instructions: 
1. All questions would be compulsory. However, an internal choice of approximately 33% 
would be provided. 50% marks are to be allotted to competency-based questions. 
2. Section A would have 16 simple/complex MCQs and 04 Assertion-Reasoning type 
questions carrying 1 mark each. 
3. Section B would have 6 Short Answer (SA) type questions carrying 02 marks each. 
4. Section C would have 7 Short Answer (SA) type questions carrying 03 marks each. 
5. Section D would have 3 Long Answer (LA) type questions carrying 05 marks each. 
6. Section E would have 3 source based/case based/passage based/integrated units of 
assessment (04 marks each) with sub-parts of the values of 1/2/3 marks. 
 
Section-A  
Question 1 to 16 are multiple choice questions. Only one of the choices is correct. Select and 
write the correct choice as well as the answer to these questions.  
1 Identify ‘p’, ‘q’ and ‘r’ in the following balanced reaction 
                 Heat 
p Pb (NO3)2(s) ------> q PbO(s) + r NO2(g) + O2(g) 
A. 2,2,4 
B. 2,4,2 
C. 2,4,4 
D. 4,2,2 
1 
2 Match column I with column II and select the correct option using the given 
codes. 
Column I Column II 
a. A metal that forms amphoteric oxides (i) Ga 
b. A metal which melts when kept on our palm (ii) Au 
c. A metal that reacts with nitric acid (iii) Al 
d. A metal which cannot displace hydrogen from 
acids 
(iv) Mn 
 
A. a – (ii), b – (i), c – (iii), d – (iv) 
B. a – (iii), b – (i), c – (iv), d – (ii) 
C. a – (iv), b – (ii), c – (iii), d – (i) 
D. a – (iii), b – (ii), c – (i), d – (iv)  
1 
Page 2


SCIENCE SQP (2024-25) 
CLASS X  
 (Science 086) 
Max. Marks: 80                                                                      Time Allowed: 3 hours  
General Instructions: 
1. All questions would be compulsory. However, an internal choice of approximately 33% 
would be provided. 50% marks are to be allotted to competency-based questions. 
2. Section A would have 16 simple/complex MCQs and 04 Assertion-Reasoning type 
questions carrying 1 mark each. 
3. Section B would have 6 Short Answer (SA) type questions carrying 02 marks each. 
4. Section C would have 7 Short Answer (SA) type questions carrying 03 marks each. 
5. Section D would have 3 Long Answer (LA) type questions carrying 05 marks each. 
6. Section E would have 3 source based/case based/passage based/integrated units of 
assessment (04 marks each) with sub-parts of the values of 1/2/3 marks. 
 
Section-A  
Question 1 to 16 are multiple choice questions. Only one of the choices is correct. Select and 
write the correct choice as well as the answer to these questions.  
1 Identify ‘p’, ‘q’ and ‘r’ in the following balanced reaction 
                 Heat 
p Pb (NO3)2(s) ------> q PbO(s) + r NO2(g) + O2(g) 
A. 2,2,4 
B. 2,4,2 
C. 2,4,4 
D. 4,2,2 
1 
2 Match column I with column II and select the correct option using the given 
codes. 
Column I Column II 
a. A metal that forms amphoteric oxides (i) Ga 
b. A metal which melts when kept on our palm (ii) Au 
c. A metal that reacts with nitric acid (iii) Al 
d. A metal which cannot displace hydrogen from 
acids 
(iv) Mn 
 
A. a – (ii), b – (i), c – (iii), d – (iv) 
B. a – (iii), b – (i), c – (iv), d – (ii) 
C. a – (iv), b – (ii), c – (iii), d – (i) 
D. a – (iii), b – (ii), c – (i), d – (iv)  
1 
3  
 
 
 
 
 
 
 
The solution in the given figure is likely to be 
A. HNO3 
B. C2H5OH 
C. H2SO4 
D. CO2 in water 
- - - - - - - - - - - - - - 
For Visual Impaired Students  
Which among the following is considered as the strongest electrolyte? 
A. Dilute acid 
B. Dilute sugar solution 
C. Glucose solution 
D. Ethanol in water 
1 
4 An aqueous solution ‘A’ turns the phenolphthalein solution pink. On addition of 
an aqueous solution ‘B’ to ‘A’, the pink colour disappears. Which of the following 
statement is true for the solutions ‘A’ and ‘B’. 
A.  A is strongly basic and B is a weak base. 
B. A is strongly acidic and B is a weak acid. 
C. A has a pH greater than 7 and B has a pH less than 7. 
D. A has a pH less than 7 and B has a pH greater than 7. 
1 
5 When 50g of lead powder is added to 300 ml of blue copper sulphate 
solution, after a few hours, the solution becomes colourless. This is an 
example of 
A. Combination reaction 
B. Decomposition reaction 
C. Displacement reaction 
D. Double displacement reaction 
1 
6 The electronic configuration of three elements X, Y and Z are X- 2, 8, 7; Y- 2, 
8, 2; and Z - 2, 8 
A. Y and Z are metals 
B. Y and X are non-metals 
C. X is a non -metal and Y is a metal 
D. Y is a non-metal and Z is a metal 
1 
7 Which of the following is an endothermic reaction? 
A. Burning of candle. 
B. Cooking of food. 
C. Decomposition of Vegetable matter. 
D. Reaction of Sodium with air 
1 
Page 3


SCIENCE SQP (2024-25) 
CLASS X  
 (Science 086) 
Max. Marks: 80                                                                      Time Allowed: 3 hours  
General Instructions: 
1. All questions would be compulsory. However, an internal choice of approximately 33% 
would be provided. 50% marks are to be allotted to competency-based questions. 
2. Section A would have 16 simple/complex MCQs and 04 Assertion-Reasoning type 
questions carrying 1 mark each. 
3. Section B would have 6 Short Answer (SA) type questions carrying 02 marks each. 
4. Section C would have 7 Short Answer (SA) type questions carrying 03 marks each. 
5. Section D would have 3 Long Answer (LA) type questions carrying 05 marks each. 
6. Section E would have 3 source based/case based/passage based/integrated units of 
assessment (04 marks each) with sub-parts of the values of 1/2/3 marks. 
 
Section-A  
Question 1 to 16 are multiple choice questions. Only one of the choices is correct. Select and 
write the correct choice as well as the answer to these questions.  
1 Identify ‘p’, ‘q’ and ‘r’ in the following balanced reaction 
                 Heat 
p Pb (NO3)2(s) ------> q PbO(s) + r NO2(g) + O2(g) 
A. 2,2,4 
B. 2,4,2 
C. 2,4,4 
D. 4,2,2 
1 
2 Match column I with column II and select the correct option using the given 
codes. 
Column I Column II 
a. A metal that forms amphoteric oxides (i) Ga 
b. A metal which melts when kept on our palm (ii) Au 
c. A metal that reacts with nitric acid (iii) Al 
d. A metal which cannot displace hydrogen from 
acids 
(iv) Mn 
 
A. a – (ii), b – (i), c – (iii), d – (iv) 
B. a – (iii), b – (i), c – (iv), d – (ii) 
C. a – (iv), b – (ii), c – (iii), d – (i) 
D. a – (iii), b – (ii), c – (i), d – (iv)  
1 
3  
 
 
 
 
 
 
 
The solution in the given figure is likely to be 
A. HNO3 
B. C2H5OH 
C. H2SO4 
D. CO2 in water 
- - - - - - - - - - - - - - 
For Visual Impaired Students  
Which among the following is considered as the strongest electrolyte? 
A. Dilute acid 
B. Dilute sugar solution 
C. Glucose solution 
D. Ethanol in water 
1 
4 An aqueous solution ‘A’ turns the phenolphthalein solution pink. On addition of 
an aqueous solution ‘B’ to ‘A’, the pink colour disappears. Which of the following 
statement is true for the solutions ‘A’ and ‘B’. 
A.  A is strongly basic and B is a weak base. 
B. A is strongly acidic and B is a weak acid. 
C. A has a pH greater than 7 and B has a pH less than 7. 
D. A has a pH less than 7 and B has a pH greater than 7. 
1 
5 When 50g of lead powder is added to 300 ml of blue copper sulphate 
solution, after a few hours, the solution becomes colourless. This is an 
example of 
A. Combination reaction 
B. Decomposition reaction 
C. Displacement reaction 
D. Double displacement reaction 
1 
6 The electronic configuration of three elements X, Y and Z are X- 2, 8, 7; Y- 2, 
8, 2; and Z - 2, 8 
A. Y and Z are metals 
B. Y and X are non-metals 
C. X is a non -metal and Y is a metal 
D. Y is a non-metal and Z is a metal 
1 
7 Which of the following is an endothermic reaction? 
A. Burning of candle. 
B. Cooking of food. 
C. Decomposition of Vegetable matter. 
D. Reaction of Sodium with air 
1 
8 During cellular oxidation of Glucose, ATP is produced along with formation of 
other products in this reaction. Which of the following events is associated with 
production of maximum ATP molecules per molecule of Glucose during this 
process? Synthesis of 
A. ethanol in yeast 
B. lactic acid in muscle cells 
C. carbon dioxide in yeast cells 
D. carbon dioxide in human cells 
1 
9 During which of the following stages of the circulation of blood in a normal 
human being, the oxygenated blood is pumped to all parts of the body? 
A. contraction of the left atrium 
B. contraction of left ventricle 
C. relaxation of the right atrium 
D. relaxation of the right ventricle 
1 
10 Which of the following adaptations in herbivores helps in digestions of 
cellulose? 
A. Longer large intestine 
B. Smaller large intestine 
C. Smaller small intestine 
D. Longer small intestine 
1 
11 There was a cerebellar dysfunction in a patient. Which of the following activities 
will get disturbed in this patient as a result of this? 
A. Salivation 
B. Hunger control 
C. Posture and balance 
D. Regulation of blood pressure 
1 
12 In snails individuals can begin life as male and depending on environmental 
conditions they can become female as they grow. This is because 
A. male snails have dominant genetic makeup. 
B. female snails have dominant genetic makeup. 
C. expression of sex chromosomes can change in a snail’s life time. 
D. sex is not genetically determined in snails. 
1 
13 In the following cases, a ray is incident on a concave mirror. In which case 
is the angle of incidence equal to zero? 
A. A ray parallel to the principal axis. 
B. A ray passing through the centre of curvature and incident obliquely. 
C. A ray passing through the principal focus and incident obliquely.  
D. A ray incident obliquely to the principal axis, at the pole of the mirror.  
1 
Page 4


SCIENCE SQP (2024-25) 
CLASS X  
 (Science 086) 
Max. Marks: 80                                                                      Time Allowed: 3 hours  
General Instructions: 
1. All questions would be compulsory. However, an internal choice of approximately 33% 
would be provided. 50% marks are to be allotted to competency-based questions. 
2. Section A would have 16 simple/complex MCQs and 04 Assertion-Reasoning type 
questions carrying 1 mark each. 
3. Section B would have 6 Short Answer (SA) type questions carrying 02 marks each. 
4. Section C would have 7 Short Answer (SA) type questions carrying 03 marks each. 
5. Section D would have 3 Long Answer (LA) type questions carrying 05 marks each. 
6. Section E would have 3 source based/case based/passage based/integrated units of 
assessment (04 marks each) with sub-parts of the values of 1/2/3 marks. 
 
Section-A  
Question 1 to 16 are multiple choice questions. Only one of the choices is correct. Select and 
write the correct choice as well as the answer to these questions.  
1 Identify ‘p’, ‘q’ and ‘r’ in the following balanced reaction 
                 Heat 
p Pb (NO3)2(s) ------> q PbO(s) + r NO2(g) + O2(g) 
A. 2,2,4 
B. 2,4,2 
C. 2,4,4 
D. 4,2,2 
1 
2 Match column I with column II and select the correct option using the given 
codes. 
Column I Column II 
a. A metal that forms amphoteric oxides (i) Ga 
b. A metal which melts when kept on our palm (ii) Au 
c. A metal that reacts with nitric acid (iii) Al 
d. A metal which cannot displace hydrogen from 
acids 
(iv) Mn 
 
A. a – (ii), b – (i), c – (iii), d – (iv) 
B. a – (iii), b – (i), c – (iv), d – (ii) 
C. a – (iv), b – (ii), c – (iii), d – (i) 
D. a – (iii), b – (ii), c – (i), d – (iv)  
1 
3  
 
 
 
 
 
 
 
The solution in the given figure is likely to be 
A. HNO3 
B. C2H5OH 
C. H2SO4 
D. CO2 in water 
- - - - - - - - - - - - - - 
For Visual Impaired Students  
Which among the following is considered as the strongest electrolyte? 
A. Dilute acid 
B. Dilute sugar solution 
C. Glucose solution 
D. Ethanol in water 
1 
4 An aqueous solution ‘A’ turns the phenolphthalein solution pink. On addition of 
an aqueous solution ‘B’ to ‘A’, the pink colour disappears. Which of the following 
statement is true for the solutions ‘A’ and ‘B’. 
A.  A is strongly basic and B is a weak base. 
B. A is strongly acidic and B is a weak acid. 
C. A has a pH greater than 7 and B has a pH less than 7. 
D. A has a pH less than 7 and B has a pH greater than 7. 
1 
5 When 50g of lead powder is added to 300 ml of blue copper sulphate 
solution, after a few hours, the solution becomes colourless. This is an 
example of 
A. Combination reaction 
B. Decomposition reaction 
C. Displacement reaction 
D. Double displacement reaction 
1 
6 The electronic configuration of three elements X, Y and Z are X- 2, 8, 7; Y- 2, 
8, 2; and Z - 2, 8 
A. Y and Z are metals 
B. Y and X are non-metals 
C. X is a non -metal and Y is a metal 
D. Y is a non-metal and Z is a metal 
1 
7 Which of the following is an endothermic reaction? 
A. Burning of candle. 
B. Cooking of food. 
C. Decomposition of Vegetable matter. 
D. Reaction of Sodium with air 
1 
8 During cellular oxidation of Glucose, ATP is produced along with formation of 
other products in this reaction. Which of the following events is associated with 
production of maximum ATP molecules per molecule of Glucose during this 
process? Synthesis of 
A. ethanol in yeast 
B. lactic acid in muscle cells 
C. carbon dioxide in yeast cells 
D. carbon dioxide in human cells 
1 
9 During which of the following stages of the circulation of blood in a normal 
human being, the oxygenated blood is pumped to all parts of the body? 
A. contraction of the left atrium 
B. contraction of left ventricle 
C. relaxation of the right atrium 
D. relaxation of the right ventricle 
1 
10 Which of the following adaptations in herbivores helps in digestions of 
cellulose? 
A. Longer large intestine 
B. Smaller large intestine 
C. Smaller small intestine 
D. Longer small intestine 
1 
11 There was a cerebellar dysfunction in a patient. Which of the following activities 
will get disturbed in this patient as a result of this? 
A. Salivation 
B. Hunger control 
C. Posture and balance 
D. Regulation of blood pressure 
1 
12 In snails individuals can begin life as male and depending on environmental 
conditions they can become female as they grow. This is because 
A. male snails have dominant genetic makeup. 
B. female snails have dominant genetic makeup. 
C. expression of sex chromosomes can change in a snail’s life time. 
D. sex is not genetically determined in snails. 
1 
13 In the following cases, a ray is incident on a concave mirror. In which case 
is the angle of incidence equal to zero? 
A. A ray parallel to the principal axis. 
B. A ray passing through the centre of curvature and incident obliquely. 
C. A ray passing through the principal focus and incident obliquely.  
D. A ray incident obliquely to the principal axis, at the pole of the mirror.  
1 
14  
 
 
 
 
 
 
 
 
 
Choose the correct option for the colour of rays for A and B. 
 
 Colour of Ray A Colour of Ray B 
A. Blue Red 
B. Green Yellow 
C. Red Violet 
D. Violet Indigo 
 
1 
15 Identify the incorrect statement   
‘The energy available to the producers is maximum’ because:  
A. It is the first trophic level which absorbs1% of light energy directly from 
the source. 
B. It utilizes the most of the chemical energy for its own respiration, growth, 
reproduction, movement etc.  
C. It utilizes 10% of light energy and transfers the rest to the next trophic 
level.  
D. It transfers only 10% of light energy to the next trophic level. 
1 
16 Which of the following is not a role of decomposers in the ecosystem?  
A. Natural replenishment of soil.  
B. Enrichment of oxygen in atmosphere. 
C. Waste decomposition. 
D. Break-down of dead remains. 
1 
Question No. 17 to 20 consist of two statements – Assertion (A) and Reason (R). Answer 
these questions by selecting the appropriate option given below:  
A. Both A and R are true, and R is the correct explanation of A.  
B. Both A and R are true, and R is not the correct explanation of A.  
C. A is true but R is false.  
D. A is false but R is true 
17 Assertion (A):  On adding dil. HCl to a test tube containing a substance ‘X’, a 
colourless gas is produced which gives a pop sound when a burning match 
stick is brought near it.  
Reason (R): In this reaction metal ‘X’ is displaced by Hydrogen. 
1 
18 Assertion (A):  The number of chromosomes in a cell and in a germ cell is not 
the same in any species.   
Reason (R): When 2 germ cells combine they restore the normal number of 
chromosomes in a species.  
1 
Page 5


SCIENCE SQP (2024-25) 
CLASS X  
 (Science 086) 
Max. Marks: 80                                                                      Time Allowed: 3 hours  
General Instructions: 
1. All questions would be compulsory. However, an internal choice of approximately 33% 
would be provided. 50% marks are to be allotted to competency-based questions. 
2. Section A would have 16 simple/complex MCQs and 04 Assertion-Reasoning type 
questions carrying 1 mark each. 
3. Section B would have 6 Short Answer (SA) type questions carrying 02 marks each. 
4. Section C would have 7 Short Answer (SA) type questions carrying 03 marks each. 
5. Section D would have 3 Long Answer (LA) type questions carrying 05 marks each. 
6. Section E would have 3 source based/case based/passage based/integrated units of 
assessment (04 marks each) with sub-parts of the values of 1/2/3 marks. 
 
Section-A  
Question 1 to 16 are multiple choice questions. Only one of the choices is correct. Select and 
write the correct choice as well as the answer to these questions.  
1 Identify ‘p’, ‘q’ and ‘r’ in the following balanced reaction 
                 Heat 
p Pb (NO3)2(s) ------> q PbO(s) + r NO2(g) + O2(g) 
A. 2,2,4 
B. 2,4,2 
C. 2,4,4 
D. 4,2,2 
1 
2 Match column I with column II and select the correct option using the given 
codes. 
Column I Column II 
a. A metal that forms amphoteric oxides (i) Ga 
b. A metal which melts when kept on our palm (ii) Au 
c. A metal that reacts with nitric acid (iii) Al 
d. A metal which cannot displace hydrogen from 
acids 
(iv) Mn 
 
A. a – (ii), b – (i), c – (iii), d – (iv) 
B. a – (iii), b – (i), c – (iv), d – (ii) 
C. a – (iv), b – (ii), c – (iii), d – (i) 
D. a – (iii), b – (ii), c – (i), d – (iv)  
1 
3  
 
 
 
 
 
 
 
The solution in the given figure is likely to be 
A. HNO3 
B. C2H5OH 
C. H2SO4 
D. CO2 in water 
- - - - - - - - - - - - - - 
For Visual Impaired Students  
Which among the following is considered as the strongest electrolyte? 
A. Dilute acid 
B. Dilute sugar solution 
C. Glucose solution 
D. Ethanol in water 
1 
4 An aqueous solution ‘A’ turns the phenolphthalein solution pink. On addition of 
an aqueous solution ‘B’ to ‘A’, the pink colour disappears. Which of the following 
statement is true for the solutions ‘A’ and ‘B’. 
A.  A is strongly basic and B is a weak base. 
B. A is strongly acidic and B is a weak acid. 
C. A has a pH greater than 7 and B has a pH less than 7. 
D. A has a pH less than 7 and B has a pH greater than 7. 
1 
5 When 50g of lead powder is added to 300 ml of blue copper sulphate 
solution, after a few hours, the solution becomes colourless. This is an 
example of 
A. Combination reaction 
B. Decomposition reaction 
C. Displacement reaction 
D. Double displacement reaction 
1 
6 The electronic configuration of three elements X, Y and Z are X- 2, 8, 7; Y- 2, 
8, 2; and Z - 2, 8 
A. Y and Z are metals 
B. Y and X are non-metals 
C. X is a non -metal and Y is a metal 
D. Y is a non-metal and Z is a metal 
1 
7 Which of the following is an endothermic reaction? 
A. Burning of candle. 
B. Cooking of food. 
C. Decomposition of Vegetable matter. 
D. Reaction of Sodium with air 
1 
8 During cellular oxidation of Glucose, ATP is produced along with formation of 
other products in this reaction. Which of the following events is associated with 
production of maximum ATP molecules per molecule of Glucose during this 
process? Synthesis of 
A. ethanol in yeast 
B. lactic acid in muscle cells 
C. carbon dioxide in yeast cells 
D. carbon dioxide in human cells 
1 
9 During which of the following stages of the circulation of blood in a normal 
human being, the oxygenated blood is pumped to all parts of the body? 
A. contraction of the left atrium 
B. contraction of left ventricle 
C. relaxation of the right atrium 
D. relaxation of the right ventricle 
1 
10 Which of the following adaptations in herbivores helps in digestions of 
cellulose? 
A. Longer large intestine 
B. Smaller large intestine 
C. Smaller small intestine 
D. Longer small intestine 
1 
11 There was a cerebellar dysfunction in a patient. Which of the following activities 
will get disturbed in this patient as a result of this? 
A. Salivation 
B. Hunger control 
C. Posture and balance 
D. Regulation of blood pressure 
1 
12 In snails individuals can begin life as male and depending on environmental 
conditions they can become female as they grow. This is because 
A. male snails have dominant genetic makeup. 
B. female snails have dominant genetic makeup. 
C. expression of sex chromosomes can change in a snail’s life time. 
D. sex is not genetically determined in snails. 
1 
13 In the following cases, a ray is incident on a concave mirror. In which case 
is the angle of incidence equal to zero? 
A. A ray parallel to the principal axis. 
B. A ray passing through the centre of curvature and incident obliquely. 
C. A ray passing through the principal focus and incident obliquely.  
D. A ray incident obliquely to the principal axis, at the pole of the mirror.  
1 
14  
 
 
 
 
 
 
 
 
 
Choose the correct option for the colour of rays for A and B. 
 
 Colour of Ray A Colour of Ray B 
A. Blue Red 
B. Green Yellow 
C. Red Violet 
D. Violet Indigo 
 
1 
15 Identify the incorrect statement   
‘The energy available to the producers is maximum’ because:  
A. It is the first trophic level which absorbs1% of light energy directly from 
the source. 
B. It utilizes the most of the chemical energy for its own respiration, growth, 
reproduction, movement etc.  
C. It utilizes 10% of light energy and transfers the rest to the next trophic 
level.  
D. It transfers only 10% of light energy to the next trophic level. 
1 
16 Which of the following is not a role of decomposers in the ecosystem?  
A. Natural replenishment of soil.  
B. Enrichment of oxygen in atmosphere. 
C. Waste decomposition. 
D. Break-down of dead remains. 
1 
Question No. 17 to 20 consist of two statements – Assertion (A) and Reason (R). Answer 
these questions by selecting the appropriate option given below:  
A. Both A and R are true, and R is the correct explanation of A.  
B. Both A and R are true, and R is not the correct explanation of A.  
C. A is true but R is false.  
D. A is false but R is true 
17 Assertion (A):  On adding dil. HCl to a test tube containing a substance ‘X’, a 
colourless gas is produced which gives a pop sound when a burning match 
stick is brought near it.  
Reason (R): In this reaction metal ‘X’ is displaced by Hydrogen. 
1 
18 Assertion (A):  The number of chromosomes in a cell and in a germ cell is not 
the same in any species.   
Reason (R): When 2 germ cells combine they restore the normal number of 
chromosomes in a species.  
1 
19 Assertion (A): A convex mirror always forms an image behind it and the image 
formed is virtual. 
Reason (R): According to the sign convention, the focal length of a convex 
mirror is positive. 
1 
20 Assertion (A): If the lions are removed from a food chain it will not affect the 
food chain, however if the plants are removed from a food chain it will disturb 
the ecosystem.   
Reason (R): Plants are producers who can make food using sunlight, while 
lions are consumers.  
1 
Section-B 
Question No. 21 to 26 are very short answer questions 
21 Identify the type of each of the following reactions stating the reason for your 
answers. 
A. Fe2O3 + 2Al ? Al2O3 + 2Fe + heat 
B. Pb (NO3)2 + 2KI ? PbI2( )+ 2KNO3 
2 
22 Differentiate between alveoli and nephron on the basis of the following points: 
S. No. Feature Alveoli Nephron 
1 Structure and location   
2 Function   
 
2 
23 Attempt either option A or B. 
A. List the steps for the synthesis of glucose by the plants. What special 
feature is found in desert plants related to this process? 
OR 
B. Explain the role of the following enzymes in the process of digestion of food 
in humans: 
(i) Salivary amylase 
(ii) Pepsin 
(iii) Trypsin 
(iv) Lipase 
2 
24 
 
The above figure shows the formation of an image by a lens shown by a thick 
line.  
2