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Page 1
MARKING SCHEME
Secondary School Examination 2023
SCIENCE (Subject Code–086)
[ Paper Code:31/1/2]
Maximum Marks: 80
Q.
No.
EXPECTED ANSWER / VALUE POINTS
Marks Total
Marks
SECTION—A
1 1
1. (c) 1 1
2.
(c)
1 1
3.
(d)
1 1
4. (b) 1 1
5. (c) 1 1
6. (a) 1 1
7.
(b)
1 1
8.
(b)
1 1
9. (d) 1 1
10. (a) 1 1
11. (d) 1 1
12.
(d)
1 1
13.
(c)
1 1
14. (b) 1 1
15. (a) 1 1
16. (d) 1 1
17.
(a)
1 1
18.
(d)
1 1
19. (c) 1 1
20.
(a)
1 1
SECTION B
Page 2
MARKING SCHEME
Secondary School Examination 2023
SCIENCE (Subject Code–086)
[ Paper Code:31/1/2]
Maximum Marks: 80
Q.
No.
EXPECTED ANSWER / VALUE POINTS
Marks Total
Marks
SECTION—A
1 1
1. (c) 1 1
2.
(c)
1 1
3.
(d)
1 1
4. (b) 1 1
5. (c) 1 1
6. (a) 1 1
7.
(b)
1 1
8.
(b)
1 1
9. (d) 1 1
10. (a) 1 1
11. (d) 1 1
12.
(d)
1 1
13.
(c)
1 1
14. (b) 1 1
15. (a) 1 1
16. (d) 1 1
17.
(a)
1 1
18.
(d)
1 1
19. (c) 1 1
20.
(a)
1 1
SECTION B
21. • They help in the breakdown of organic matter/ dead and decaying
matter into simple inorganic raw materials.
• Help in natural replenishment of nutrient in soil.
• Help in keeping the environment clean. (Any two)
1,1
2
22. (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
23.
• 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:31/1/2]
Maximum Marks: 80
Q.
No.
EXPECTED ANSWER / VALUE POINTS
Marks Total
Marks
SECTION—A
1 1
1. (c) 1 1
2.
(c)
1 1
3.
(d)
1 1
4. (b) 1 1
5. (c) 1 1
6. (a) 1 1
7.
(b)
1 1
8.
(b)
1 1
9. (d) 1 1
10. (a) 1 1
11. (d) 1 1
12.
(d)
1 1
13.
(c)
1 1
14. (b) 1 1
15. (a) 1 1
16. (d) 1 1
17.
(a)
1 1
18.
(d)
1 1
19. (c) 1 1
20.
(a)
1 1
SECTION B
21. • They help in the breakdown of organic matter/ dead and decaying
matter into simple inorganic raw materials.
• Help in natural replenishment of nutrient in soil.
• Help in keeping the environment clean. (Any two)
1,1
2
22. (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
23.
• 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
24. Fruit is acidic in nature because acid turns blue litmus red. 1,1 2
25.
•
Or explaind in the form of paragraph.
2
2
26.
(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
Page 4
MARKING SCHEME
Secondary School Examination 2023
SCIENCE (Subject Code–086)
[ Paper Code:31/1/2]
Maximum Marks: 80
Q.
No.
EXPECTED ANSWER / VALUE POINTS
Marks Total
Marks
SECTION—A
1 1
1. (c) 1 1
2.
(c)
1 1
3.
(d)
1 1
4. (b) 1 1
5. (c) 1 1
6. (a) 1 1
7.
(b)
1 1
8.
(b)
1 1
9. (d) 1 1
10. (a) 1 1
11. (d) 1 1
12.
(d)
1 1
13.
(c)
1 1
14. (b) 1 1
15. (a) 1 1
16. (d) 1 1
17.
(a)
1 1
18.
(d)
1 1
19. (c) 1 1
20.
(a)
1 1
SECTION B
21. • They help in the breakdown of organic matter/ dead and decaying
matter into simple inorganic raw materials.
• Help in natural replenishment of nutrient in soil.
• Help in keeping the environment clean. (Any two)
1,1
2
22. (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
23.
• 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
24. Fruit is acidic in nature because acid turns blue litmus red. 1,1 2
25.
•
Or explaind in the form of paragraph.
2
2
26.
(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
SECTION C
27.
(a) (i) Kitchen Garden ? A man made ecosystem / non-sustainable
Forest ? Ecosystem maintained by nature / self-sustainable
(ii)In a jar containing water we can provide oxygen through a pump
and add a few aquatic plants and animals to make it a self-
sustaining system.
Justification –
• Oxygen is replenished continuously.
• Aquatic plants serve as food.
(or any other example)
OR
(b) (i) Plants ? ? ? Rats ? ? ? Snakes ? ? ? Hawks
(ii) Energy available at second trophic level = 20,000 J
Energy transferred from second to third trophic level = 2000 J
Energy transferred from third to fourth trophic level = 200 J
1
1
1
1
1
1
3
28. (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)
1
½, ½
½, ½
Page 5
MARKING SCHEME
Secondary School Examination 2023
SCIENCE (Subject Code–086)
[ Paper Code:31/1/2]
Maximum Marks: 80
Q.
No.
EXPECTED ANSWER / VALUE POINTS
Marks Total
Marks
SECTION—A
1 1
1. (c) 1 1
2.
(c)
1 1
3.
(d)
1 1
4. (b) 1 1
5. (c) 1 1
6. (a) 1 1
7.
(b)
1 1
8.
(b)
1 1
9. (d) 1 1
10. (a) 1 1
11. (d) 1 1
12.
(d)
1 1
13.
(c)
1 1
14. (b) 1 1
15. (a) 1 1
16. (d) 1 1
17.
(a)
1 1
18.
(d)
1 1
19. (c) 1 1
20.
(a)
1 1
SECTION B
21. • They help in the breakdown of organic matter/ dead and decaying
matter into simple inorganic raw materials.
• Help in natural replenishment of nutrient in soil.
• Help in keeping the environment clean. (Any two)
1,1
2
22. (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
23.
• 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
24. Fruit is acidic in nature because acid turns blue litmus red. 1,1 2
25.
•
Or explaind in the form of paragraph.
2
2
26.
(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
SECTION C
27.
(a) (i) Kitchen Garden ? A man made ecosystem / non-sustainable
Forest ? Ecosystem maintained by nature / self-sustainable
(ii)In a jar containing water we can provide oxygen through a pump
and add a few aquatic plants and animals to make it a self-
sustaining system.
Justification –
• Oxygen is replenished continuously.
• Aquatic plants serve as food.
(or any other example)
OR
(b) (i) Plants ? ? ? Rats ? ? ? Snakes ? ? ? Hawks
(ii) Energy available at second trophic level = 20,000 J
Energy transferred from second to third trophic level = 2000 J
Energy transferred from third to fourth trophic level = 200 J
1
1
1
1
1
1
3
28. (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)
1
½, ½
½, ½
Magnetic field lines of a current carrying solenoid
(2)
Magnetic field lines of a bar magnet
(ii)
Magnetic field of a solenoid Magnetic field of a bar magnet
1. The strength of the
magnetic field can be
changed by changing the
current.
1. The strength of the
magnetic field for a bar
magnet cannot be
changed.
2. The direction of magnetic
field can be reversed by
reversing the direction of
current.
2. The direction of magnetic
field for a bar magnet
cannot be changed.
3. It is a temporary magnetic
field.
3 It is a permanent magnetic
field.
(Any two)
1
1
½, ½
3
29.
•Defect : Myopia/Short sightedness
Two Causes :
• Excessive curvature of the eye lens
• Elongation of the eyeball
1
½
½
1
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Document Description: Class 10 Science Answer Sheet for 2023 ( SET-2) for Class 10 2024 is part of Science Class 10 preparation.
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