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Page 1
MARKING SCHEME
Secondary School Examination, 2023
SCIENCE (Subject Code–086)
[ Paper Code:31/1/1]
Maximum Marks: 80
Q.
No.
EXPECTED ANSWER / VALUE POINTS
Marks Total
Marks
SECTION—A
1. (b) 1 1
2.
(a)
1 1
3.
(c)
1 1
4. (b) 1 1
5. (b) 1 1
6. (c) 1 1
7. (c) 1 1
8. (d) 1 1
9. (d) 1 1
10. (a) 1 1
11. (d) 1 1
12. (d) 1 1
13. (d) 1 1
14. (a) 1 1
15. (c) 1 1
16. (c) 1 1
17.
(a)
1 1
18. (c) 1 1
19. (c) 1 1
Page 2
MARKING SCHEME
Secondary School Examination, 2023
SCIENCE (Subject Code–086)
[ Paper Code:31/1/1]
Maximum Marks: 80
Q.
No.
EXPECTED ANSWER / VALUE POINTS
Marks Total
Marks
SECTION—A
1. (b) 1 1
2.
(a)
1 1
3.
(c)
1 1
4. (b) 1 1
5. (b) 1 1
6. (c) 1 1
7. (c) 1 1
8. (d) 1 1
9. (d) 1 1
10. (a) 1 1
11. (d) 1 1
12. (d) 1 1
13. (d) 1 1
14. (a) 1 1
15. (c) 1 1
16. (c) 1 1
17.
(a)
1 1
18. (c) 1 1
19. (c) 1 1
20. (a) 1
1
SECTION B
21.
(a) (i) X: Plaster of Paris/Calcium sulphate hemihydrate.
• CaSO
4
.
2
1
H
2
O
(ii) • Baking Soda – NaHCO
3
/Sodium hydrogen carbonate/
Sodium bicarbonate
•Baking Powder – A mixture of NaHCO
3 /Baking soda +
Tartaric acid/any mild edible acid
OR
(b) (i) CuSO
4
. 5H
2
O ? ? ? ? ?
heat
CuSO
4
+ 5H
2
O
(ii) 2NaHCO
3
? ? ? ? ?
heat
Na
2
CO
3
+ H
2
O + CO
2
½
½
½
½
1
1
2
22. (a) • Lowers blood sugar levels
• Diabetes
(b) The rise in sugar level in blood produces more insulin.
As the blood sugar level falls, secretion is reduced.
½
½
1
2
23. (a) (i) Vena cava – deoxygenated blood from body to heart.
(ii) Pulmonary artery – deoxygenated blood from heart to lungs.
OR
(b)
(i)
(ii)
½, ½
½, ½
1
1
2
24.
• Kidneys
• Structure: A cluster of thin-walled capillaries (glomerulus)
associated with cup-shaped end of a tube called
Bowman’s capsule. This further extends into a
tubular part which ends in collective ducts. /
½
1
Page 3
MARKING SCHEME
Secondary School Examination, 2023
SCIENCE (Subject Code–086)
[ Paper Code:31/1/1]
Maximum Marks: 80
Q.
No.
EXPECTED ANSWER / VALUE POINTS
Marks Total
Marks
SECTION—A
1. (b) 1 1
2.
(a)
1 1
3.
(c)
1 1
4. (b) 1 1
5. (b) 1 1
6. (c) 1 1
7. (c) 1 1
8. (d) 1 1
9. (d) 1 1
10. (a) 1 1
11. (d) 1 1
12. (d) 1 1
13. (d) 1 1
14. (a) 1 1
15. (c) 1 1
16. (c) 1 1
17.
(a)
1 1
18. (c) 1 1
19. (c) 1 1
20. (a) 1
1
SECTION B
21.
(a) (i) X: Plaster of Paris/Calcium sulphate hemihydrate.
• CaSO
4
.
2
1
H
2
O
(ii) • Baking Soda – NaHCO
3
/Sodium hydrogen carbonate/
Sodium bicarbonate
•Baking Powder – A mixture of NaHCO
3 /Baking soda +
Tartaric acid/any mild edible acid
OR
(b) (i) CuSO
4
. 5H
2
O ? ? ? ? ?
heat
CuSO
4
+ 5H
2
O
(ii) 2NaHCO
3
? ? ? ? ?
heat
Na
2
CO
3
+ H
2
O + CO
2
½
½
½
½
1
1
2
22. (a) • Lowers blood sugar levels
• Diabetes
(b) The rise in sugar level in blood produces more insulin.
As the blood sugar level falls, secretion is reduced.
½
½
1
2
23. (a) (i) Vena cava – deoxygenated blood from body to heart.
(ii) Pulmonary artery – deoxygenated blood from heart to lungs.
OR
(b)
(i)
(ii)
½, ½
½, ½
1
1
2
24.
• Kidneys
• Structure: A cluster of thin-walled capillaries (glomerulus)
associated with cup-shaped end of a tube called
Bowman’s capsule. This further extends into a
tubular part which ends in collective ducts. /
½
1
• Function:
Filtration of nitrogenous waste from blood to form urine. /
Reabsorption of useful materials from the filtrate. /
Osmoregulation (Any one function)
½
2
25 (a)
• Dispersion of white light
• Cause: Different colours of light bend through different angles
w.r.t. the incident ray. / Different colours have different
wavelengths.
OR
(b) (i) It is due to gradual weakening of the ciliary muscles and
diminishing flexibility of the eye lens.
(ii) Presbyopia/ Presbyopia + Myopia
(iii) Bifocal /Concave + Convex lens/ Diagram
1
½
½
½, ½
½
½
2
Page 4
MARKING SCHEME
Secondary School Examination, 2023
SCIENCE (Subject Code–086)
[ Paper Code:31/1/1]
Maximum Marks: 80
Q.
No.
EXPECTED ANSWER / VALUE POINTS
Marks Total
Marks
SECTION—A
1. (b) 1 1
2.
(a)
1 1
3.
(c)
1 1
4. (b) 1 1
5. (b) 1 1
6. (c) 1 1
7. (c) 1 1
8. (d) 1 1
9. (d) 1 1
10. (a) 1 1
11. (d) 1 1
12. (d) 1 1
13. (d) 1 1
14. (a) 1 1
15. (c) 1 1
16. (c) 1 1
17.
(a)
1 1
18. (c) 1 1
19. (c) 1 1
20. (a) 1
1
SECTION B
21.
(a) (i) X: Plaster of Paris/Calcium sulphate hemihydrate.
• CaSO
4
.
2
1
H
2
O
(ii) • Baking Soda – NaHCO
3
/Sodium hydrogen carbonate/
Sodium bicarbonate
•Baking Powder – A mixture of NaHCO
3 /Baking soda +
Tartaric acid/any mild edible acid
OR
(b) (i) CuSO
4
. 5H
2
O ? ? ? ? ?
heat
CuSO
4
+ 5H
2
O
(ii) 2NaHCO
3
? ? ? ? ?
heat
Na
2
CO
3
+ H
2
O + CO
2
½
½
½
½
1
1
2
22. (a) • Lowers blood sugar levels
• Diabetes
(b) The rise in sugar level in blood produces more insulin.
As the blood sugar level falls, secretion is reduced.
½
½
1
2
23. (a) (i) Vena cava – deoxygenated blood from body to heart.
(ii) Pulmonary artery – deoxygenated blood from heart to lungs.
OR
(b)
(i)
(ii)
½, ½
½, ½
1
1
2
24.
• Kidneys
• Structure: A cluster of thin-walled capillaries (glomerulus)
associated with cup-shaped end of a tube called
Bowman’s capsule. This further extends into a
tubular part which ends in collective ducts. /
½
1
• Function:
Filtration of nitrogenous waste from blood to form urine. /
Reabsorption of useful materials from the filtrate. /
Osmoregulation (Any one function)
½
2
25 (a)
• Dispersion of white light
• Cause: Different colours of light bend through different angles
w.r.t. the incident ray. / Different colours have different
wavelengths.
OR
(b) (i) It is due to gradual weakening of the ciliary muscles and
diminishing flexibility of the eye lens.
(ii) Presbyopia/ Presbyopia + Myopia
(iii) Bifocal /Concave + Convex lens/ Diagram
1
½
½
½, ½
½
½
2
26. The chemicals sprayed on crops are washed down into the soil. From the
soil these are absorbed by plants along with water and minerals, plants
are eaten by animals. This way they enter in a food chain.
As these chemicals are not degradable, these get accumulated
progressively at each successive trophic level. This phenomena is called
bio magnification.
2
2
SECTION C
27. (a) (i) NH
3
(ii) H
2
O
(iii) CO
(iv) H
2
(Award full mark if part (ii)of (a) is attempted)
(b) A reaction in which the gain or loss of oxygen takes place
simultaneously is called a redox reaction.
½ x 4
1
3
28. (a) (i) Use of antacids
(ii) Baking soda/mild base/dock plant.
(b) pH will decrease, as curd is more acidic than milk.
1
1
½+½
3
29. (a) (i) Energy currency for cellular processes / ATP breaks down to
give a fixed amount of energy which can drive the endothermic
reactions taking place in the cell.
(ii) Stomata and surface of leaves, stems and roots.
(iii) Environmental conditions
Requirements of the plant.
OR
(b) (i) Plants -Starch
Animals- Glycogen
(ii) Desert plants take up carbon dioxide at night and prepare an
intermediate compound which is acted upon by the energy
absorbed by the chlorophyll during the day.
1
1
½
½
1
1
1
3
30. (a)
A ? B ? is the image formed.
Credit full mark if attempted.
(b) Nature: Virtual and erect
Position: Behind the mirror (between P and F)
1
½
½
Page 5
MARKING SCHEME
Secondary School Examination, 2023
SCIENCE (Subject Code–086)
[ Paper Code:31/1/1]
Maximum Marks: 80
Q.
No.
EXPECTED ANSWER / VALUE POINTS
Marks Total
Marks
SECTION—A
1. (b) 1 1
2.
(a)
1 1
3.
(c)
1 1
4. (b) 1 1
5. (b) 1 1
6. (c) 1 1
7. (c) 1 1
8. (d) 1 1
9. (d) 1 1
10. (a) 1 1
11. (d) 1 1
12. (d) 1 1
13. (d) 1 1
14. (a) 1 1
15. (c) 1 1
16. (c) 1 1
17.
(a)
1 1
18. (c) 1 1
19. (c) 1 1
20. (a) 1
1
SECTION B
21.
(a) (i) X: Plaster of Paris/Calcium sulphate hemihydrate.
• CaSO
4
.
2
1
H
2
O
(ii) • Baking Soda – NaHCO
3
/Sodium hydrogen carbonate/
Sodium bicarbonate
•Baking Powder – A mixture of NaHCO
3 /Baking soda +
Tartaric acid/any mild edible acid
OR
(b) (i) CuSO
4
. 5H
2
O ? ? ? ? ?
heat
CuSO
4
+ 5H
2
O
(ii) 2NaHCO
3
? ? ? ? ?
heat
Na
2
CO
3
+ H
2
O + CO
2
½
½
½
½
1
1
2
22. (a) • Lowers blood sugar levels
• Diabetes
(b) The rise in sugar level in blood produces more insulin.
As the blood sugar level falls, secretion is reduced.
½
½
1
2
23. (a) (i) Vena cava – deoxygenated blood from body to heart.
(ii) Pulmonary artery – deoxygenated blood from heart to lungs.
OR
(b)
(i)
(ii)
½, ½
½, ½
1
1
2
24.
• Kidneys
• Structure: A cluster of thin-walled capillaries (glomerulus)
associated with cup-shaped end of a tube called
Bowman’s capsule. This further extends into a
tubular part which ends in collective ducts. /
½
1
• Function:
Filtration of nitrogenous waste from blood to form urine. /
Reabsorption of useful materials from the filtrate. /
Osmoregulation (Any one function)
½
2
25 (a)
• Dispersion of white light
• Cause: Different colours of light bend through different angles
w.r.t. the incident ray. / Different colours have different
wavelengths.
OR
(b) (i) It is due to gradual weakening of the ciliary muscles and
diminishing flexibility of the eye lens.
(ii) Presbyopia/ Presbyopia + Myopia
(iii) Bifocal /Concave + Convex lens/ Diagram
1
½
½
½, ½
½
½
2
26. The chemicals sprayed on crops are washed down into the soil. From the
soil these are absorbed by plants along with water and minerals, plants
are eaten by animals. This way they enter in a food chain.
As these chemicals are not degradable, these get accumulated
progressively at each successive trophic level. This phenomena is called
bio magnification.
2
2
SECTION C
27. (a) (i) NH
3
(ii) H
2
O
(iii) CO
(iv) H
2
(Award full mark if part (ii)of (a) is attempted)
(b) A reaction in which the gain or loss of oxygen takes place
simultaneously is called a redox reaction.
½ x 4
1
3
28. (a) (i) Use of antacids
(ii) Baking soda/mild base/dock plant.
(b) pH will decrease, as curd is more acidic than milk.
1
1
½+½
3
29. (a) (i) Energy currency for cellular processes / ATP breaks down to
give a fixed amount of energy which can drive the endothermic
reactions taking place in the cell.
(ii) Stomata and surface of leaves, stems and roots.
(iii) Environmental conditions
Requirements of the plant.
OR
(b) (i) Plants -Starch
Animals- Glycogen
(ii) Desert plants take up carbon dioxide at night and prepare an
intermediate compound which is acted upon by the energy
absorbed by the chlorophyll during the day.
1
1
½
½
1
1
1
3
30. (a)
A ? B ? is the image formed.
Credit full mark if attempted.
(b) Nature: Virtual and erect
Position: Behind the mirror (between P and F)
1
½
½
Size: Diminished
(c) Positive
½
½
3
31. (a) Red Coloured light is least scattered by fog or smoke and can be
easily seen from a distance. / Red colour has high wavelength thus
scattering is less.
(b) There is no scattering of light due to lack of atmosphere.
(c) Particles of colloid are big enough to scatter the beam of light.
1
1
1
3
32. (a) (i) Flemings left-hand rule:
Stretch the forefinger, the central finger and the thumb of your
left hand in mutually perpendicular directions. If the
forefinger shows the direction of the magnetic field and the
central finger that of the current, then the thumb will point
towards the direction of motion of the conductor or direction
of force /
(ii) (1) Force on electron is maximum in Fig (i) because the direction
of motion of electron/current is at right angle/perpendicular to
that of magnetic field.
(2) Force on electron is minimum in Fig (iii) because the electron
is moving along / parallel to the direction of magnetic field
OR
(b) (i) (1)
Magnetic field lines of a current carrying solenoid
1
½, ½
½, ½
1
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FAQs on Class 10 Science Answer Sheet for 2023 (SET-1) - Science Class 10
| 1. What topics are typically covered in the Class 10 Science exam? |  |
Ans. The Class 10 Science exam generally covers a range of topics including Physics, Chemistry, and Biology. Key areas include motion, force, light, electricity, chemical reactions, acids and bases, the structure of the atom, reproduction, and human health. It is important to review the syllabus provided by your educational board for specific topics.
| 2. How can I prepare effectively for the Class 10 Science exam? | |
Ans. Effective preparation for the Class 10 Science exam involves a systematic study plan. Start by reviewing your textbook and notes, practicing sample papers, and understanding key concepts. Utilize visual aids like diagrams and flowcharts for better retention, and consider joining study groups for discussions. Regular revision and solving previous years' question papers can also enhance your preparation.
| 3. What is the marking scheme for the Class 10 Science exam? | |
Ans. The marking scheme for the Class 10 Science exam varies by educational board but typically consists of multiple-choice questions, short answer questions, and long answer questions. Each section may have different weightage, and practical exams may also contribute to the final score. It's essential to check the specific guidelines from your board for accurate information.
| 4. Are there any important tips for answering the Science exam questions? | |
Ans. When answering Science exam questions, read each question carefully and underline keywords. For theoretical questions, ensure you provide clear and concise definitions, and for practical questions, include relevant diagrams where necessary. Allocate your time wisely, and if you get stuck, move on to the next question and return later if time permits.
| 5. How can I manage my time during the Class 10 Science exam? | |
Ans. To manage your time effectively during the Class 10 Science exam, first, familiarize yourself with the exam format and allocate time according to the marks for each section. Spend a few minutes reading through all questions before starting. Prioritize questions you feel confident about, and keep an eye on the clock to ensure you have time to review your answers before submitting.
About this Document
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Dec 22, 2024 Last updated |
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Class 10 Science Answer Sheet for 2023 (SET-1) Free PDF Download
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