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## Science Class 9

Created by: Dr Manju Sen

## Class 9 : Notes | EduRev

``` Page 1

CBSE IX | SCIENCE
Sample Paper – 2 Solution

CBSE
Class IX Science
Sample Paper – 2 Solution

Section A
1. Pseudomonas

2. Fumigation is the most effective method for destroying insects in stored grains.

Section B
3. Factors which affect the value of g: (any two)
(i) Shape of the Earth: The Earth is not perfectly spherical. It is slightly flattened at the
poles and bulgy towards the equator. The value of g is maximum (9.83 m/s
2
) at the
poles as the polar radius is minimum, while it is minimum (9.78 m/s
2
) at the
equator as the equatorial radius is maximum.
(ii)  Altitude: As the height (h) above the Earth’s surface increases, the value of g
decreases. It varies by a value of
?
2
1
(R h)
, where R is the radius of the Earth.
(iii) Depth: In the interior of the Earth, on an average, the value of g is less than that at
the Earth’s surface. As the depth below the Earth’s surface increases, the value of g
decreases, and finally, it becomes zero at the centre of the Earth.
OR
(i) Mass is the amount of matter contained in a body. So, it can never be zero.
(ii) Weight is the force with which the body is attracted towards the centre of the Earth.
(iii) Mathematically, weight is the product of mass (m) and acceleration due to gravity
(g). At the centre of the Earth, g is zero.
(iv) Hence, weight is zero. This shows that a body can have mass but no weight.
4.
Cathode rays Anode rays
These rays travel from the cathode to the
anode.
These rays travel from the anode to the
cathode.
They are made of negatively charged
particles.
They are made of positively charged
particles.
They produce a greenish yellow
fluorescence on a soda-glass screen.
They produce fluorescence on a zinc
sulphide screen.
They are affected by an electric field, i.e.
they are inflected towards a positive
field and deflected towards a negative
field.
They are deflected by electric and
magnetic fields but in a direction
opposite to that of cathode rays.
Page 2

CBSE IX | SCIENCE
Sample Paper – 2 Solution

CBSE
Class IX Science
Sample Paper – 2 Solution

Section A
1. Pseudomonas

2. Fumigation is the most effective method for destroying insects in stored grains.

Section B
3. Factors which affect the value of g: (any two)
(i) Shape of the Earth: The Earth is not perfectly spherical. It is slightly flattened at the
poles and bulgy towards the equator. The value of g is maximum (9.83 m/s
2
) at the
poles as the polar radius is minimum, while it is minimum (9.78 m/s
2
) at the
equator as the equatorial radius is maximum.
(ii)  Altitude: As the height (h) above the Earth’s surface increases, the value of g
decreases. It varies by a value of
?
2
1
(R h)
, where R is the radius of the Earth.
(iii) Depth: In the interior of the Earth, on an average, the value of g is less than that at
the Earth’s surface. As the depth below the Earth’s surface increases, the value of g
decreases, and finally, it becomes zero at the centre of the Earth.
OR
(i) Mass is the amount of matter contained in a body. So, it can never be zero.
(ii) Weight is the force with which the body is attracted towards the centre of the Earth.
(iii) Mathematically, weight is the product of mass (m) and acceleration due to gravity
(g). At the centre of the Earth, g is zero.
(iv) Hence, weight is zero. This shows that a body can have mass but no weight.
4.
Cathode rays Anode rays
These rays travel from the cathode to the
anode.
These rays travel from the anode to the
cathode.
They are made of negatively charged
particles.
They are made of positively charged
particles.
They produce a greenish yellow
fluorescence on a soda-glass screen.
They produce fluorescence on a zinc
sulphide screen.
They are affected by an electric field, i.e.
they are inflected towards a positive
field and deflected towards a negative
field.
They are deflected by electric and
magnetic fields but in a direction
opposite to that of cathode rays.

CBSE IX | SCIENCE
Sample Paper – 2 Solution

5.
(a) Pear consists of sclereids or stone cells.
(b) They form the gritty part of most ripe fruits and contribute hardness to the seed
coat and nutshell.
(c) Therefore, when we chew a pear, we get a crunchy and granular feeling due to the
presence of sclereids.

Section C

6.
(a) Ribosome
(b) Leucoplast
(c) Nucleolus

7.
(a) Arthropoda: Jointed legs or appendages
(b) Annelida: Metamerically segmented body
(c) Porifera: Body perforated with numerous pores
OR
Differences between amphibians and reptiles:
Amphibians Reptiles
1. Skin is glandular, smooth and
moist.
1. Skin is non-glandular, dry and
keratinised.
2. Have a three-chambered heart. 2. Have an incomplete four-
chambered heart.
3. Fertilisation is external. 3. Fertilisation is internal.
4. Examples: Frog, toad 4. Examples: Snake, lizard

8.
(i) Net force F = F2 ? F1 = 30 ? 20 = 10 N
(ii) Net force acts along the direction of F2.
(iii) Acceleration F = ma
?
? ? ?
2
10
a 1 ms
10

9. There are colloidal particles of mist in the forest.
When light passes through the canopy of the forest, these colloidal particles are
scattered and we observe the Tyndall effect.
Smoke and milk also show the Tyndall effect.

Page 3

CBSE IX | SCIENCE
Sample Paper – 2 Solution

CBSE
Class IX Science
Sample Paper – 2 Solution

Section A
1. Pseudomonas

2. Fumigation is the most effective method for destroying insects in stored grains.

Section B
3. Factors which affect the value of g: (any two)
(i) Shape of the Earth: The Earth is not perfectly spherical. It is slightly flattened at the
poles and bulgy towards the equator. The value of g is maximum (9.83 m/s
2
) at the
poles as the polar radius is minimum, while it is minimum (9.78 m/s
2
) at the
equator as the equatorial radius is maximum.
(ii)  Altitude: As the height (h) above the Earth’s surface increases, the value of g
decreases. It varies by a value of
?
2
1
(R h)
, where R is the radius of the Earth.
(iii) Depth: In the interior of the Earth, on an average, the value of g is less than that at
the Earth’s surface. As the depth below the Earth’s surface increases, the value of g
decreases, and finally, it becomes zero at the centre of the Earth.
OR
(i) Mass is the amount of matter contained in a body. So, it can never be zero.
(ii) Weight is the force with which the body is attracted towards the centre of the Earth.
(iii) Mathematically, weight is the product of mass (m) and acceleration due to gravity
(g). At the centre of the Earth, g is zero.
(iv) Hence, weight is zero. This shows that a body can have mass but no weight.
4.
Cathode rays Anode rays
These rays travel from the cathode to the
anode.
These rays travel from the anode to the
cathode.
They are made of negatively charged
particles.
They are made of positively charged
particles.
They produce a greenish yellow
fluorescence on a soda-glass screen.
They produce fluorescence on a zinc
sulphide screen.
They are affected by an electric field, i.e.
they are inflected towards a positive
field and deflected towards a negative
field.
They are deflected by electric and
magnetic fields but in a direction
opposite to that of cathode rays.

CBSE IX | SCIENCE
Sample Paper – 2 Solution

5.
(a) Pear consists of sclereids or stone cells.
(b) They form the gritty part of most ripe fruits and contribute hardness to the seed
coat and nutshell.
(c) Therefore, when we chew a pear, we get a crunchy and granular feeling due to the
presence of sclereids.

Section C

6.
(a) Ribosome
(b) Leucoplast
(c) Nucleolus

7.
(a) Arthropoda: Jointed legs or appendages
(b) Annelida: Metamerically segmented body
(c) Porifera: Body perforated with numerous pores
OR
Differences between amphibians and reptiles:
Amphibians Reptiles
1. Skin is glandular, smooth and
moist.
1. Skin is non-glandular, dry and
keratinised.
2. Have a three-chambered heart. 2. Have an incomplete four-
chambered heart.
3. Fertilisation is external. 3. Fertilisation is internal.
4. Examples: Frog, toad 4. Examples: Snake, lizard

8.
(i) Net force F = F2 ? F1 = 30 ? 20 = 10 N
(ii) Net force acts along the direction of F2.
(iii) Acceleration F = ma
?
? ? ?
2
10
a 1 ms
10

9. There are colloidal particles of mist in the forest.
When light passes through the canopy of the forest, these colloidal particles are
scattered and we observe the Tyndall effect.
Smoke and milk also show the Tyndall effect.

CBSE IX | SCIENCE
Sample Paper – 2 Solution

(a) Risk of total crop failure because of an uncertain monsoon is reduced.
(b) Yield of crops is increased because of the complementary effect of component crops.
(c) Soil fertility is improved by growing two crops simultaneously.
(d) Chances of pest infection are greatly reduced.
(a) There is a difficulty in fertiliser application and spraying of pesticides to individual
crops.
(b) Separate harvesting and threshing of crops is not possible.
(c) Marketing and consumption of only mixed produce are possible.

11.
(a) Whales and fish are aquatic animals and belong to Phylum Chordata. However, they
both differ in several basic characters.
(b) Whales are warm-blooded, while fish are cold-blooded animals.
(c) Whales respire through the lungs, while fish breathe through gills.
(d) Whales possess mammary glands which are absent in fish.
(e) Whales have a four-chambered heart, while fish have a two-chambered heart.
(f) Therefore, although both resemble each other and swim in water, whales cannot be
grouped with fish.
(g) Whales belong to Class Mammalia, whiles fish are included in Class Pisces.

12. 1 mole of Ca = 40 g
No. of atoms of calcium = no. of moles × 6.022 × 10
23

= (Given Mass/Molar Mass) × 6.022 × 10
23

= (125/40) × 6.022 × 10
23

= 1.88 × 10
24
atoms
No. of atoms of iron = (Given Mass/Molar Mass) × 6.022 × 10
23

= (130/56) × 6.022 × 10
23

= 1.39 × 10
24
atoms
Calcium has more number of atoms.
Difference in number of atoms = 1.88 × 10
24
- 1.39 × 10
24

= 10
24
(1.88 - 1.39)
= 0.49 × 10
24
= 4.9 × 10
23
atoms
OR
Mass of sodium carbonate + mass of ethanoic acid = mass of sodium ethanoate + mass
of water + mass of carbon dioxide
5.6 g + 7.0 g = x + 2.8 + 0.7 g
x = 12.6 - 3.5 = 9.1 g

Page 4

CBSE IX | SCIENCE
Sample Paper – 2 Solution

CBSE
Class IX Science
Sample Paper – 2 Solution

Section A
1. Pseudomonas

2. Fumigation is the most effective method for destroying insects in stored grains.

Section B
3. Factors which affect the value of g: (any two)
(i) Shape of the Earth: The Earth is not perfectly spherical. It is slightly flattened at the
poles and bulgy towards the equator. The value of g is maximum (9.83 m/s
2
) at the
poles as the polar radius is minimum, while it is minimum (9.78 m/s
2
) at the
equator as the equatorial radius is maximum.
(ii)  Altitude: As the height (h) above the Earth’s surface increases, the value of g
decreases. It varies by a value of
?
2
1
(R h)
, where R is the radius of the Earth.
(iii) Depth: In the interior of the Earth, on an average, the value of g is less than that at
the Earth’s surface. As the depth below the Earth’s surface increases, the value of g
decreases, and finally, it becomes zero at the centre of the Earth.
OR
(i) Mass is the amount of matter contained in a body. So, it can never be zero.
(ii) Weight is the force with which the body is attracted towards the centre of the Earth.
(iii) Mathematically, weight is the product of mass (m) and acceleration due to gravity
(g). At the centre of the Earth, g is zero.
(iv) Hence, weight is zero. This shows that a body can have mass but no weight.
4.
Cathode rays Anode rays
These rays travel from the cathode to the
anode.
These rays travel from the anode to the
cathode.
They are made of negatively charged
particles.
They are made of positively charged
particles.
They produce a greenish yellow
fluorescence on a soda-glass screen.
They produce fluorescence on a zinc
sulphide screen.
They are affected by an electric field, i.e.
they are inflected towards a positive
field and deflected towards a negative
field.
They are deflected by electric and
magnetic fields but in a direction
opposite to that of cathode rays.

CBSE IX | SCIENCE
Sample Paper – 2 Solution

5.
(a) Pear consists of sclereids or stone cells.
(b) They form the gritty part of most ripe fruits and contribute hardness to the seed
coat and nutshell.
(c) Therefore, when we chew a pear, we get a crunchy and granular feeling due to the
presence of sclereids.

Section C

6.
(a) Ribosome
(b) Leucoplast
(c) Nucleolus

7.
(a) Arthropoda: Jointed legs or appendages
(b) Annelida: Metamerically segmented body
(c) Porifera: Body perforated with numerous pores
OR
Differences between amphibians and reptiles:
Amphibians Reptiles
1. Skin is glandular, smooth and
moist.
1. Skin is non-glandular, dry and
keratinised.
2. Have a three-chambered heart. 2. Have an incomplete four-
chambered heart.
3. Fertilisation is external. 3. Fertilisation is internal.
4. Examples: Frog, toad 4. Examples: Snake, lizard

8.
(i) Net force F = F2 ? F1 = 30 ? 20 = 10 N
(ii) Net force acts along the direction of F2.
(iii) Acceleration F = ma
?
? ? ?
2
10
a 1 ms
10

9. There are colloidal particles of mist in the forest.
When light passes through the canopy of the forest, these colloidal particles are
scattered and we observe the Tyndall effect.
Smoke and milk also show the Tyndall effect.

CBSE IX | SCIENCE
Sample Paper – 2 Solution

(a) Risk of total crop failure because of an uncertain monsoon is reduced.
(b) Yield of crops is increased because of the complementary effect of component crops.
(c) Soil fertility is improved by growing two crops simultaneously.
(d) Chances of pest infection are greatly reduced.
(a) There is a difficulty in fertiliser application and spraying of pesticides to individual
crops.
(b) Separate harvesting and threshing of crops is not possible.
(c) Marketing and consumption of only mixed produce are possible.

11.
(a) Whales and fish are aquatic animals and belong to Phylum Chordata. However, they
both differ in several basic characters.
(b) Whales are warm-blooded, while fish are cold-blooded animals.
(c) Whales respire through the lungs, while fish breathe through gills.
(d) Whales possess mammary glands which are absent in fish.
(e) Whales have a four-chambered heart, while fish have a two-chambered heart.
(f) Therefore, although both resemble each other and swim in water, whales cannot be
grouped with fish.
(g) Whales belong to Class Mammalia, whiles fish are included in Class Pisces.

12. 1 mole of Ca = 40 g
No. of atoms of calcium = no. of moles × 6.022 × 10
23

= (Given Mass/Molar Mass) × 6.022 × 10
23

= (125/40) × 6.022 × 10
23

= 1.88 × 10
24
atoms
No. of atoms of iron = (Given Mass/Molar Mass) × 6.022 × 10
23

= (130/56) × 6.022 × 10
23

= 1.39 × 10
24
atoms
Calcium has more number of atoms.
Difference in number of atoms = 1.88 × 10
24
- 1.39 × 10
24

= 10
24
(1.88 - 1.39)
= 0.49 × 10
24
= 4.9 × 10
23
atoms
OR
Mass of sodium carbonate + mass of ethanoic acid = mass of sodium ethanoate + mass
of water + mass of carbon dioxide
5.6 g + 7.0 g = x + 2.8 + 0.7 g
x = 12.6 - 3.5 = 9.1 g

CBSE IX | SCIENCE
Sample Paper – 2 Solution

13.
(i) The boat floats lower in water, that is, it sinks a little more in water.
(ii) Weight of water displaced by the submerged part of the boat increases.
(iii) Because of the greater weight of water displaced, the buoyant force acting on the
boat increases. This greater buoyant force enables the extra weight of the man in the
boat.

14.
(a) The centrifugation technique is used in the process.
(b) The same technique is used to extract cream from milk.
(c) Rohini’s mother teaches us the value of saving water.

15. Table A

Height from
which an
object is
dropped
‘h’ (m)
Velocity of an
object falling
from the
height
‘v
2
’ (m/s
2
)
Potential
energy
mgh (J)
Kinetic
energy
½mv
2
(J)
TE =
PE + KE
10 0 20 ? 10 ?10
= 2000
½ ? 20 ? 0 = 0  2000
2 80 20 ? 10 ?2
= 400
½ ? 20 ? 80 =
800
1200

Table B
Height from
which an
object is
dropped
‘h’ (m)
Velocity of an
object falling
from the
height
‘v
2
’ (m/s
2
)
Potential
energy
mgh (J)
Kinetic
energy
½mv
2
(J)
TE =
PE + KE
10 0 20 ? 10 ?10
= 2000
½ ? 20 ? 0 = 0  2000
2 40 20 ? 10 ?2
= 400
½ ? 20 ? 40 =
400
800

According to the law of conservation of energy, the sum of potential energy and
kinetic energy of the object should remain the same at every point during its fall.
OR

Page 5

CBSE IX | SCIENCE
Sample Paper – 2 Solution

CBSE
Class IX Science
Sample Paper – 2 Solution

Section A
1. Pseudomonas

2. Fumigation is the most effective method for destroying insects in stored grains.

Section B
3. Factors which affect the value of g: (any two)
(i) Shape of the Earth: The Earth is not perfectly spherical. It is slightly flattened at the
poles and bulgy towards the equator. The value of g is maximum (9.83 m/s
2
) at the
poles as the polar radius is minimum, while it is minimum (9.78 m/s
2
) at the
equator as the equatorial radius is maximum.
(ii)  Altitude: As the height (h) above the Earth’s surface increases, the value of g
decreases. It varies by a value of
?
2
1
(R h)
, where R is the radius of the Earth.
(iii) Depth: In the interior of the Earth, on an average, the value of g is less than that at
the Earth’s surface. As the depth below the Earth’s surface increases, the value of g
decreases, and finally, it becomes zero at the centre of the Earth.
OR
(i) Mass is the amount of matter contained in a body. So, it can never be zero.
(ii) Weight is the force with which the body is attracted towards the centre of the Earth.
(iii) Mathematically, weight is the product of mass (m) and acceleration due to gravity
(g). At the centre of the Earth, g is zero.
(iv) Hence, weight is zero. This shows that a body can have mass but no weight.
4.
Cathode rays Anode rays
These rays travel from the cathode to the
anode.
These rays travel from the anode to the
cathode.
They are made of negatively charged
particles.
They are made of positively charged
particles.
They produce a greenish yellow
fluorescence on a soda-glass screen.
They produce fluorescence on a zinc
sulphide screen.
They are affected by an electric field, i.e.
they are inflected towards a positive
field and deflected towards a negative
field.
They are deflected by electric and
magnetic fields but in a direction
opposite to that of cathode rays.

CBSE IX | SCIENCE
Sample Paper – 2 Solution

5.
(a) Pear consists of sclereids or stone cells.
(b) They form the gritty part of most ripe fruits and contribute hardness to the seed
coat and nutshell.
(c) Therefore, when we chew a pear, we get a crunchy and granular feeling due to the
presence of sclereids.

Section C

6.
(a) Ribosome
(b) Leucoplast
(c) Nucleolus

7.
(a) Arthropoda: Jointed legs or appendages
(b) Annelida: Metamerically segmented body
(c) Porifera: Body perforated with numerous pores
OR
Differences between amphibians and reptiles:
Amphibians Reptiles
1. Skin is glandular, smooth and
moist.
1. Skin is non-glandular, dry and
keratinised.
2. Have a three-chambered heart. 2. Have an incomplete four-
chambered heart.
3. Fertilisation is external. 3. Fertilisation is internal.
4. Examples: Frog, toad 4. Examples: Snake, lizard

8.
(i) Net force F = F2 ? F1 = 30 ? 20 = 10 N
(ii) Net force acts along the direction of F2.
(iii) Acceleration F = ma
?
? ? ?
2
10
a 1 ms
10

9. There are colloidal particles of mist in the forest.
When light passes through the canopy of the forest, these colloidal particles are
scattered and we observe the Tyndall effect.
Smoke and milk also show the Tyndall effect.

CBSE IX | SCIENCE
Sample Paper – 2 Solution

(a) Risk of total crop failure because of an uncertain monsoon is reduced.
(b) Yield of crops is increased because of the complementary effect of component crops.
(c) Soil fertility is improved by growing two crops simultaneously.
(d) Chances of pest infection are greatly reduced.
(a) There is a difficulty in fertiliser application and spraying of pesticides to individual
crops.
(b) Separate harvesting and threshing of crops is not possible.
(c) Marketing and consumption of only mixed produce are possible.

11.
(a) Whales and fish are aquatic animals and belong to Phylum Chordata. However, they
both differ in several basic characters.
(b) Whales are warm-blooded, while fish are cold-blooded animals.
(c) Whales respire through the lungs, while fish breathe through gills.
(d) Whales possess mammary glands which are absent in fish.
(e) Whales have a four-chambered heart, while fish have a two-chambered heart.
(f) Therefore, although both resemble each other and swim in water, whales cannot be
grouped with fish.
(g) Whales belong to Class Mammalia, whiles fish are included in Class Pisces.

12. 1 mole of Ca = 40 g
No. of atoms of calcium = no. of moles × 6.022 × 10
23

= (Given Mass/Molar Mass) × 6.022 × 10
23

= (125/40) × 6.022 × 10
23

= 1.88 × 10
24
atoms
No. of atoms of iron = (Given Mass/Molar Mass) × 6.022 × 10
23

= (130/56) × 6.022 × 10
23

= 1.39 × 10
24
atoms
Calcium has more number of atoms.
Difference in number of atoms = 1.88 × 10
24
- 1.39 × 10
24

= 10
24
(1.88 - 1.39)
= 0.49 × 10
24
= 4.9 × 10
23
atoms
OR
Mass of sodium carbonate + mass of ethanoic acid = mass of sodium ethanoate + mass
of water + mass of carbon dioxide
5.6 g + 7.0 g = x + 2.8 + 0.7 g
x = 12.6 - 3.5 = 9.1 g

CBSE IX | SCIENCE
Sample Paper – 2 Solution

13.
(i) The boat floats lower in water, that is, it sinks a little more in water.
(ii) Weight of water displaced by the submerged part of the boat increases.
(iii) Because of the greater weight of water displaced, the buoyant force acting on the
boat increases. This greater buoyant force enables the extra weight of the man in the
boat.

14.
(a) The centrifugation technique is used in the process.
(b) The same technique is used to extract cream from milk.
(c) Rohini’s mother teaches us the value of saving water.

15. Table A

Height from
which an
object is
dropped
‘h’ (m)
Velocity of an
object falling
from the
height
‘v
2
’ (m/s
2
)
Potential
energy
mgh (J)
Kinetic
energy
½mv
2
(J)
TE =
PE + KE
10 0 20 ? 10 ?10
= 2000
½ ? 20 ? 0 = 0  2000
2 80 20 ? 10 ?2
= 400
½ ? 20 ? 80 =
800
1200

Table B
Height from
which an
object is
dropped
‘h’ (m)
Velocity of an
object falling
from the
height
‘v
2
’ (m/s
2
)
Potential
energy
mgh (J)
Kinetic
energy
½mv
2
(J)
TE =
PE + KE
10 0 20 ? 10 ?10
= 2000
½ ? 20 ? 0 = 0  2000
2 40 20 ? 10 ?2
= 400
½ ? 20 ? 40 =
400
800

According to the law of conservation of energy, the sum of potential energy and
kinetic energy of the object should remain the same at every point during its fall.
OR

CBSE IX | SCIENCE
Sample Paper – 2 Solution

Time of ascent = Time of descent = 6/2 = 3 s
(a)
2
v 0,a g 9.8 m/s ? ? ? ? ?
According to the first equation of motion, we have

v u at
0 u 9.8 3
u 29.4 m/s
??
? ? ?
?

Hence, the ball was thrown up with a speed of 29.4 m/s.
(b)  According to the second equation of motion, we have

22
2
2
v u 2as
0 29.4 2 9.8 h
29.4
h 44.1 m
19.6
??
? ? ? ?
??

Hence, the ball reaches a maximum height of 44.1 m.

(c)  After the first three seconds, the ball is moving downwards.
Hence, 4 s after launch means 1 s after reaching the maximum height.
Thus, according to the third equation of motion, we have

2
2
1
s ut at
2
1
h 0 9.8 1
2
h 4.9 m
??
? ? ? ?
?

Hence, its position after 4 s is 44.1 – 4.9 = 39.2 m from the ground.

Section D
16.
(a) Niels Bohr revised Rutherford’s atomic model and put forth the following
suggestions:
? Niels Bohr proposed that the electrons possess a specific amount of energy
which allows them to revolve around the nucleus.
? An atom contains discrete orbits which correspond to specific amount of energy.
Hence, these orbits are also known as energy levels.
? Energy levels of an atom are represented as K, L, M, N and so on or the numbers
n = 1, 2, 3, 4 and so on.

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