CBSE Class 10 Physics The Human Eye and The Colorful World Worksheet Set A

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Chapter 11 The Human Eye and The Colourful World Science Worksheet for Class 10

Class 10 Science students should refer to the following printable worksheet in Pdf in Class 10. This test paper with questions and solutions for Class 10 Science will be very useful for tests and exams and help you to score better marks

Class 10 Science Chapter 11 The Human Eye and The Colourful World Worksheet Pdf

 
Question : The deviation in the path of ray of light can be produced- 
(a) By a glass prism but not by rectangular glass slab.
(b) By a glass prism as well as a rectangular glass slab.
(c) By a rectangular glass slab but not by a glass prism.
(d) Neither by a glass prism nor by rectangular glass slab.
 
Answer : A
Explanation: The angle of deviation through a triangular prism is the angle between the incident ray and the emerging ray (angle δ). However, in glass slab, the incident ray and the emergent ray are parallel to each other thus angle of incidence is equal to angle of emergence.
 
Question : The values of f and u for a concave lens are always 
(a) Negative
(b) None of these
(c) Positive
(d) Sometimes negative sometimes positive
 
Answer : A 
Explanation: By convention,
i. The focal length (f) of concave lens is always taken as negative.
ii. The object distance (u) from optical centre is always taken as negative.
 
Question : Rainbow is formed due to combination of? 
A. Refraction
B. Absorption
C. Dispersion
D. Total internal reflection
(a) A and B
(b) A and C
(c) C and D
(d) A, B and C
 
Answer : C 
Explanation: The rainbow is a natural spectrum of sunlight appearing in the sky after a rain shower. It is formed due to the dispersion of sunlight by the tiny water droplet, present in atmosphere. Water droplet act like prism. It refract and disperse the incident sunlight, then reflect it internally (total internal reflection) and finally refract it again, when it emerges out of the water droplet. Red colour appear on top & violet at the bottom of rainbow.

Human Eye And Colorful World Assertion Reason Class 10 Science  

A. Both assertion and reason are true, and reason is the correct explanation of assertion.
B. Both assertion and reason are true, but reason is not the correct explanation of assertion.
C. Assertion is true but reason is false.
D. Assertion is false and reason is true.

Question. Assertion (A): The twinkling of stars is due to the fact that refractive index of the earth’s atmosphere fluctuates.
Reason (R): In cold countries, the phenomenon of looming (i.e ship appears in the sky) takes place, because refractive index of air decreases with height.

Answer: B

Question. Assertion(A): A prism can split the incident white light into bands of different colours.
Reason(R): The different colours of light bend through different angles with respect to the incident rays.

Answer: A

Question. Assertion(A): Rainbow is formed in the sky due to the dispersion of sunlight by water droplets.
Reason(R): Light of shorter wavelength is scattered much more than the light of longer wavelength.

Answer: B

Question. Assertion(A): In case of rainbow, light at the inner surface of the water drop gets internally reflected.
Reason(R): The angle between the refracted ray and normal to the drop surface is greater than the critical angle.

Answer: A

Question. Assertion: Red light travels faster in glass than green light.
Reason: The refractive index of glass is less for green light.

Answer: C

Question. Assertion(A): The red light bends the least while the violet bends the most.
Reason(R): Red light has short wavelength whereas violet has long wavelength.

Answer: C

Question. Assertion: The colour of the scattered light does not depend on the size of the scattering particles.
Reason: Red light is used as a danger signal because it can travel longer distances through rain and fog.

Answer: C

Question. Assertion(A): The Sun appears flattened at sunrise and sunset.
Reason (R): The apparent flattering of the Sun’s disc at sunrise and sunset is due to atmospheric refraction.

Answer: A

Question. Assertion: The sky appears dark in outer space.
Reason : Scattering does not occur in outer space as there is no atmosphere.

Answer: A

Very Short Answers

 
Question :  What is the approx. diameter of the eyeball? 
Answer :  The eye- ball is approx. spherical in shape having a diameter of about 25 cm.
 
Question :  What are the main parts of the human eye? 
Answer :  The main parts of the human eye are: cornea, iris, pupil, eye lens, ciliary muscles, and retina and optic nerve.
 
Question :  What do you mean by the pupil of the eye? 
Answer :  A hole in the middle of the iris which is called pupil of the eye.
 
Question :  What is retina?
Answer :  The screen on which the image is formed in the eye is called retina.
 
Question :  Is focal length of eye lens fixed? 
Answer :  Focal length varies due to action of ciliary muscles. Hence, Eye lens has variable focal length.

Question. What is the colour of scattered sunlight when the size of the scattering particles is relatively large? 
Answer: When white sunlight falls on relatively larger particles (like dust particles, etc.) present in the atmosphere, it is scattered as such so the scattered light appears blue.

Question. List the factors on which the angle of deviation through a prism depend?
Answer: Angle of deviation through a prism depends
• on the –A called – of prism;
• on the – of incidence;
• on the optical density of the material of the prism.

Question. Explain why the planets do not twinkle.
Answer: The planets are much closer to the earth. A planet can be considered as a collection of a large number of point-sized sources of light. So that total variation in the amount of light entering our eye from all the individual point-sized sources will average out to zero thereby nullifying the twinkling effect.

Question. Give an example of a phenomenon where Tyndall effect can be observed. 
Answer: The scattering of light by particles of colloid or suspension in its path is called Tyndall effect. When sunlight passes through the canopy of a dense forest, the tiny water droplets in the mist scatter sunlight.

Question. Which phenomenon is responsible for making the path of light visible?
Answer: Tyndall effect is responsible for making the path of light visible.

Question. State one role of ciliary muscles in the human eye. 
Answer: The focal length of eye-lens can be changed by changing its shape by the action of ciliary muscles.

Question. What happens to the image distance in the eye when we increase the distance of an object from the eye?
Answer: The image distance remains unchanged. As the distance of the object increases, the focal length of eye lens is adjusted by the ciliary muscles so that the image is always formed at the retina.

Question. State one function of iris in human eye. 
Answer: Function of iris. Iris regulates the amount of light entering the eye by adjusting the size of the pupil.

Question. What will be the colour of the sky when it is observed from a place in the absence of any atmosphere?
Answer: The colour of sky will be black when it is observed from a place where atmosphere is absent as scattering of light does not take place when there is no atmosphere.

Question. The sky appears dark instead of blue to an astronaut. State its reason. 
Answer: There is no atmosphere containing air in space to scatter sunlight. As there is no scattering of light in space, the scattered light does not reach the eyes and the sky appears dark instead of blue to an astronaut in outer space.

Question : What is the far point and near point of the human eye with normal vision? 
Answer :  For a human eye with normal vision the far point of the eye is the location of the farthest object on which the fully relaxed eye can focus. For a normal eye the far point is at infinity and the near point is at 25 cm from the eye.
 
Question :  What is cornea? 
Answer :  The front part of the eye is called cornea.

Question : What is meant by power of accommodation of the eye ?
Answer: The power of accommodation of the eye is the maximum variation of its power for focusing on near and far (distant) objects.

Question : A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision ?
Answer: Concave lens.

Question : What is the far point and near point of the human eye with normal vision ?
Answer: For a human eye with normal vision the far point is at infinity and near point is 25 cm from the eye.

Question : A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from ? How can it be corrected?
Answer: The child is suffering from myopia. The child should use concave lens of suitable focal length.

Question : A student has difficulty reading the blackboard while sitting in the front row. What could be the defect the child is suffering from ? How can it be corrected?
Answer: The child is suffering from hypermetropia. The child should use convex lens of suitable focal length.

 

Short Answers

 
Question :  A narrow beam PQ of white light is passing through a glass prism ABC as shown in the diagram.
T-12
Trace it on your answer sheet and show the path of the emergent beam as observed on the screen DE. 
i. Write the name and cause of the phenomenon observed.
ii. Where else in nature is this phenomenon observed?
iii. Based on this observation, state the conclusion which can be draw about the constituents of white light.
Answer :
 
T-13
 
i. The phenomenon of splitting of white light into its constituent colours is called dipersion of light. It is caused due to difference in speed of constituent colours of light travel in the medium other than air/vacuum because of different speed they bend at different angles.
ii. In nature, this Phenomenon is observed in formation of rainbow where all the seven colours constituting white light is visible.
iii. Based on phenomenon of dispersion, we can conclude that
a. White light consists of seven colours. Violet, indigo, blue, green, yellow, orange and red.
b. Violet light suffers maximum deviation and red light suffers minimum deviation. 

Question. A very thin narrow beam of white light is made incident on one face of rectangular glass slab and one face of the combination of two prisms, one up and one down in contact. Comment on the nature of the behaviour of the emergent beam in the above two cases.
Answer: Case 1: The emergent beam refracted through a rectangular glass slab emerges parallel to the incident ray and is shifted sideward slightly. No dispersion occurs.
Case 2: The emergent beam from the second inverted identical prism is again white light and emerges parallel to the incident beam and shifted sideward slightly. Overall no dispersion occurs due to the combination of two prisms placed inverted to each other.
Thus emergent ray in both the cases emerges from the opposite parallel faces and is parallel to the incident ray.

Question. The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
Answer: The far point of this myopic person is 80 cm. (This means that this person can see a distant object kept at infinity clearly if the image of this object is formed at his far point.)
u = ∞, v = –80 cm, f = ?
Using Lens formula
1/v - 1/u = 1/f          ∴   1/-18 - 1/∞ = 1/f
⇒ 1/f = -1/80  - 0 = -1/80       ∴   f = –80 cm = –0.8 m
Negative sign indicates the lens is concave.
Power, P = 1/f = 1/- 0.8 m = –1.25            ∴   P = –1.25 D
A concave lens of power –1.25 D is required to correct the problem.

Question. What eye defect is myopia? Describe with a neat diagram how this defect of vision can be corrected by using a suitable lens. 
Answer: Myopia is the defect of the eye vision due to which a person can see the near objects clearly, but he cannot see the far objects clearly.
Causes of myopia. Myopia is caused
— due to the elongation of the eye ball.
— due to decrease in the focal length of the eye lens. The eye lens becomes more convergent.
Myopia can be corrected by using a concave lens of suitable focal length in the spectacles of such a person.

Question. What is a spectrum? Why do different coloured rays deviate differently on passing through a glass prism? 
Answer: Meaning of spectrum. When a beam of white light is passed through a prism, a band of seven colours is formed on a white screen. This is called spectrum of white light.
The dispersion of white light occurs because the angle of refraction or angle of bending of different components of the white light is different when passing through the glass prism. When white light consisting of seven colours falls on a prism, each colour is refracted or deviated by a different angle, with the result that the seven coloured band, i.e., spectrum is formed.

Question. What eye defect is hypermetropia? Describe with a ray diagram how this defect of vision can be corrected by using an appropriate lens. 
Answer: Long sightedness is hypermetropia. Due to this defect, a person is not able to see the nearby objects clearly but can see the distant objects clearly.
Causes of long-sightedness. It is caused due to the following reasons:
— Normal increase in the focal length of the eye lens. The lens becomes less convergent.
— Shortening of the eyeball size.
Long sightedness can be corrected by using a convex lens of suitable focal length in the spectacles of such a person.
When a convex lens of suitable power is placed in front of the hypermetropic eye then the diverging rays of light coming from the nearby object are first converged by this convex lens. Due to this, the convex lens forms a virtual image of the nearby object at a point near to the hypermetropic eye. Then the hypermetropic eye can easily focus the image formed by convex lens on the retina.

Question. What is the colour of the clear sky during day-time? Give reason for it. 
Answer: During day time the colour of the sky is blue.
Reason: The molecules of air and other fine particles in the atmosphere have a size smaller than the wavelength of visible light. So these particles scatter more effectively the light rays of shorter wavelength at the blue end than light of longer wavelengths at the red end. When the scattered blue light enters our eyes, it gives us the feeling of a blue sky.

Question. State the difference in colours of the Sun observed during sunrise/sunset and noon. Give explanation for each. 
Answer: The Sun and surrounding sky appear red at sunrise and at sunset because at this time the Sun is near the horizon and sunlight has to travel the greatest distance through the atmosphere to reach us. Thus most of the blue colour present in sunlight has been scattered out and away from our line of sight, leaving behind mainly red colour in the direct sunlight beam that reaches our eyes. When the Sun is overhead (as at noon) then the light coming from the Sun has to travel a relatively shorter distance through the atmosphere to reach us. Thus only a little of blue colour of the white light is scattered. Since the light coming from the overhead Sun has almost all its component colours in the right proportion,
therefore the Sun in the sky overhead appears white.

Question. When and where do we see a rainbow? How is a rainbow formed? Draw a labelled diagram to illustrate the formation of a rainbow. 
Answer: Rainbow is caused by dispersion of sunlight by tiny water droplets present in the atmosphere. The water droplets act like small prisms. They refract the incident sunlight and then reflect it internally and finally refract it again when it comes out of the rain-drop. A rainbow is always formed in the direction opposite to that of the Sun.

Question. Explain giving reason why the sky appears blue to an observer from the surface of the earth? What will the colour of the sky be for an astronaut staying in the international space station orbiting the earth?
Answer: Sky appears blue. The molecules of air and other fine particles in the atmosphere have a size smaller than the wavelength of visible light. So these particles scatter more effectively the light rays of shorter wavelength at the blue end than light of longer wavelengths at the red end. When the scattered blue light enters our eyes, it gives us the feeling of a blue sky. Colour of sky to an astronaut. There is no atmosphere containing air in space to scatter sunlight. As there is no scattering of light in space, the scattered light does not reach the eyes and the sky appears dark instead of blue to an astronaut in outer space.

Question. Explain with help of a labelled diagram, the cause of twinkling of stars. 
Answer: Twinkling of Stars. The twinkling of a star is due to atmospheric refraction of star light. The atmospheric refraction occurs in a medium of gradually changing refractive index. Since the atmosphere bends star light towards the normal, the apparent position of the star is slightly different from the actual position.
This apparent position of the star is not stationary, but keeps on changing slightly as the physical conditions of the earth’s atmosphere are not stationary.
Since the stars are very distant, they act as point-sized sources of light. As the path of rays of light coming from the star goes on varying slightly, the apparent position of the star fluctuates and the amount of light entering the eye flickers—the star sometimes appears brighter and at other times appears fainter, which is the twinkling effect.

Question : Why do different rays deviate differently in the prism? 
Answer : Different wavelengths deviate differently in the prism because the angle of refraction for different colours having different wavelengths is different while passing through the glass prism (medium). A light ray is refracted when it passes from one medium to another at an angle and its speed changes. At the interface, it is bent in one direction if the material it enters is denser (when light slows down) and in the other direction if the material is less dense (when light speeds up). Because different wavelengths (colours) of light travel through a medium at different speeds, the amount of bending is different for different wavelengths. Violet is bent the most and red the least because violet light has a shorter wavelength, and short wavelengths travel more slowly through a medium than longer ones do.

Question : What happens to the image distance in the eye when we increase the distance of an object from the eye ?
Answer: The eye lens of a normal eye forms the images of objects at various distances on the same retina. Therefore, the image distance in the eye remains the same.

Question : Why do stars twinkle?
Answer: Stars appear to twinkle due to atmospheric refraction. The light of star after the entry of light in earth’s atmosphere undergoes refraction continuously till it reaches the surface of the earth. Stars are far away. So, they are the point source of light. As the path of light coming from stars keep changing, thus the apparent position of stars keep changing and amount of light from stars entering the eye keeps twinkling. Due to which a star sometimes appear bright and sometimes dim, which is the effect of twinkling.

Question : Explain why the planets do not twinkle?
Answer: The planets are much nearer to the earth than stars and because of this they can be considered as large source of light. If a planet is considered to be a collection of a very large number of point sources of light, then the average value of change in the amount of light entering the eye from all point size light sources is zero. Due to this the effect of twinkling is nullified.

Question : Why does the sun appear reddish early in the morning?
Answer: The light coming from the sun passes through various denser layers of air in the earth’s atmosphere before reaching our eyes near the horizon. Most of the part of blue
light and light of small wavelength gets scattered by dust particles near the horizon. So, the light reaching our eyes is of large wavelength. Due to this the sun appears reddish at the time of sunrise and sunset.

Question : Why does the sky appear dark instead of blue to an astronaut?
Answer: As an astronaut moves away from the atmosphere of earth, the atmosphere becomes thin. Due to the absence of molecules (or dust particles) in air, the scattering of light does not take place. Thus, sky appears dark in the absence of scattering.

 

Long Answers

 
Question :  A person is not able to see far off objects clearly. From which defect of the eye the person is suffering ? How to correct this defect ? 
Answer :  The person is suffering from myopia or short-sightedness.
Myopia or short-sightedness: In normal eye, the far point is at infinity. The rays coming from distant object (at infinity) gets focused on retina. In turn, the retina conveys the message to brain via optic nerve.
T-14
Normal eye: Far point at infinity. Rays from distant object meet at retina.
T-15
 
Defective eye: Eye ball is enlarged, or focal length decreased, cannot focus rays from infinity at focus.
T-16
Defective eye: Far point is nearer than infinity when at far point F.
T-17
 
Corrected eye: Concave (or any divergent) lens diverges the parallel rays from infinity to an extent that they appear to diverge from F. They get focused at retina.
Causes of defect in defective eye: The defect arise due to either :
Due to either or both the causes, the eye is not able to focus the rays from distant object at retina. Focusing is there at a point O in front of retina. Image formed on retina is blurred.
The defective eye is however able to focus the object upto its far point.
Correct of defect: We have observed that the defective eye has not been able to focus less inclined rays but has been able to focus more inclined rays.
To correct this defect, a concave or a divergent lens of appropriate focal length is placed in front of the eye so that parallel rays coming from infinity appear, after refraction through the lens, to come from the far point when eye is unaccommodated.
These parallel rays from a distant object shall be brought to focus upon the retina.
Obviously, the focal length of such a lens is equal to the distance of the far point from the eye.
i. the length of eyeball of eye lens has decreased.
ii. the focal length of eye lens has decreased.

Question. List three common refractive defects of vision. Suggest the way of correcting these defects. 
Answer: The three defects of vision:
(i) Myopia. Myopia is the defect of the eye vision due to which a person can see the near objects clearly, but he can not see the far objects clearly.
Causes of myopia. Myopia is caused due to the elongation of the eye ball and due to decrease in the focal length of the eye lens. The eye lens becomes more convergent.
Correction. Myopia can be corrected by using a concave lens of suitable focal length in the spectacles of such a person.
(ii) Long-sightedness or hypermetropia. Due to this defect, a person is not able to see the nearby objects clearly but can see the distant objects clearly.
Causes of hypermetropia. It is caused due to the following reasons:
• Normal increase in the focal length of the eye lens. The lens becomes less convergent.
• Shortening of the eyeball size.
Correction. Long sightedness can be corrected by using a convex lens of suitable focal length in the spectacles of such a person.
When a convex lens of suitable power is placed in front of the hypermetropic eye then the diverging rays of light coming from the nearby object are first converged by this convex lens. Due to this, the convex lens forms a virtual image of the nearby object at a point near to the hypermetropic eye. Then the hypermetropic eye can easily focus the image formed by convex lens on the retina.
(iii) Presbyopia. The power of accommodation of the eye decreases with ageing. It occurs due to the gradual weakening of the ciliary muscles and decreasing flexibility of the crystalline lens. The near point of the eye increases with age. It may reach even 2 metres. This defect is called presbyopia.
Causes of presbyopia. It is mainly caused due to the weakening of the ciliary muscles of the eyes.
Such a person may suffer from myopia and hypermetropia.
Correction. This defect is then corrected by using bifocal lenses of suitable focal lengths. The upper part of the lens is a concave lens for correcting myopia to see the distant objects clearly, while the lower part of the lens has a convex lens to correct the hypermetropia to see the nearby objects clearly.

Question. Nalin and his four friends were sitting on his roof on a pleasant day. All of them were enjoying Ludo. Suddenly Ayush saw seven colours in the sky. He jumped with joy and shouted “Look, there is an Indradhanush in the sky”. Then Nalin explained all about the rainbow. After that every one clapped for him.
(a) What information is given by Nalin to his friends about a rainbow?
(b) Is it possible to obtain rainbow phenomenon on the earth?
(c) Which term is used for the seven colours of the rainbow?
(d) Which colour appears at the top and at the bottom of the rainbow? 
Answer: (a) Rainbow is a natural phenomenon in which an arch of seven colours visible in the sky is produced by the dispersion of white sunlight by raindrops in the atmosphere. Each raindrop acts as a tiny glass prism splitting the sunlight into seven colours.
(b) Yes, in daily life, when white light of the Sun is passed through a glass prism, it splits into seven colours.
(c) The band of seven colours obtained by the splitting of white light is called spectrum.
(d) The red colour appears at the top of the rainbow whereas violet colour appears at its bottom.

Question. (a) List the parts of the human eye that control the amount of light entering into it. Explain how they perform this function.
(b) Write the function of retina in human eye. 
Answer: (a) The iris and pupil control the amount of light entering the eyes. If the amount of light received by the eye is large (as during the day time), then the iris contracts the pupil (makes the pupil small) and reduces the amount of light entering the eye.
If the amount of light received by the eye is small (as in a dark room or during night), the iris expands the pupil (makes the pupil large) so that more light may enter the eyes.
(b) The screen on which the image is formed in the eye is called retina. Retina is a delicate membrane having a large number of light sensitive cells called ‘rods’ and ‘cones’ which respond to the ‘intensity of light’ and ‘colours of object’ respectively.

Question : Draw the sketch diagram of human eye. And explain about the different parts of eye.
Answer: 

CBSE Class 10 Physics The Human Eye and The Colorful World

The human eye is the most sensitive part of the human body. By closing our eyes, we can sense some objects with their smell, taste, sound they make or by touching them but we cannot identify the colour without opening our eyes.
Parts of human eyes: -
•Cornea- the outermost part of the eye, light enters from this part.
• Eye lens- it is a convex lens its curvature is controlled by ciliary muscles.
•Iris- The part of the eye which controls the size of the pupil.
Pupil- The aperture of the pupil varies with the help of the iris. Pupil regulates and controls the amount of light entering the eye.
•Retina- The light-sensitive screen, where the image of any object is formed

Question : How can we see objects?
Answer: - First light enters in our eye from cornea. If the light is very bright, the iris contracts the
pupil to allow less light to enter the eye and in dim light the iris expends pupil to allow
more light in the eye. This light incident on the eye lens and image is formed at the
retina. The optic nerves transmit electrical impulses to the brain and we get
information about the object.

Question : What do you mean by the defect hypermetropia in human eye, how it can be corrected? Draw suitable ray diagrams.
Answer: -
(i) a person can’t see – nearby objects clearly a person can see –distant objects clearly
(ii) Defect arises due to -Focal length of eye lens increased (power decreased) - Shortening of eyeball
(iii) Defect correction by Using a convex lens of suitable power

CBSE Class 10 Physics The Human Eye and The Colorful World

Question : What do you mean by the defect myopia in human eye, how it can be corrected? Draw suitable ray diagrams.
(i) a person can see – nearby objects clearly a person can’t see –distant objects clearly
(ii) Defect arises due to -Focal length of eye lens decreased (power increased) -Elongation of eyeball
(iii) Defect correction by Using a concave lens of suitable power

CBSE Class 10 Physics The Human Eye and The Colorful World

Question : What is dispersion of light? Explain it with a suitable diagram. Draw the necessary diagram, and show the recombination of light by using glass prisms.
Answer: - Dispersion of light by a glass prism: - The splitting of light into its component colours is called dispersion of light. A prism can split the incident white light into a band of colours. The sequence of colours is Violet, Indigo, Blue, Green, Yellow, Orange and Red.
We remember it with “VIBGYOR”.
- The band of the coloured components of a light beam is called its spectrum.
- Red light bends least and violet most.

CBSE Class 10 Physics The Human Eye and The Colorful World

Recombination of spectrum: - Isaac Newton was the first to use a glass prism to obtain the spectrum of sunlight. By using one prism light splits in seven colours and by using another prism in inverted position with respect to the first prism, we found a beam of white light emerging from the other side of the second prism. So here first prism is splitting second is recombining.

CBSE Class 10 Physics The Human Eye and The Colorful World

Chapter 06 Life Processes
CBSE Class 10 Biology Excretion Set A
CBSE Class 10 Biology Excretion Set B
CBSE Class 10 Biology Excretion Set C
CBSE Class 10 Biology Heterotrophic Nutrition Worksheet Set A
CBSE Class 10 Biology Heterotrophic Nutrition Worksheet Set B
CBSE Class 10 Biology Life Processes Nutrition In Animals Worksheet
CBSE Class 10 Biology Life Processes Nutrition In Plants Worksheet
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set A
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set B
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set C
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set D
CBSE Class 10 Biology Life Processes Reference Materials Worksheet
CBSE Class 10 Biology Life Processes Respiration In Animals Worksheet
CBSE Class 10 Biology Life Processes Respiration Worksheet Set A
CBSE Class 10 Biology Life Processes Respiration Worksheet Set B
CBSE Class 10 Biology Life Processes Respiration Worksheet Set C
CBSE Class 10 Biology Life Processes Respiration Worksheet Set D
CBSE Class 10 Biology Life Processes Transporation Worksheet Set A
CBSE Class 10 Biology Life Processes Transporation Worksheet Set B
CBSE Class 10 Biology Life Processes Transporation Worksheet Set C
CBSE Class 10 Biology Life Processes Transporation Worksheet Set D
CBSE Class 10 Biology Life Processes Worksheet
CBSE Class 10 Biology Life Processes Worksheet Set A
CBSE Class 10 Biology Life Processes Worksheet Set B
CBSE Class 10 Biology Life Processes Worksheet Set C
CBSE Class 10 Biology Life Processes Worksheet Set D
CBSE Class 10 Biology Life Processes Worksheet Set E
Chapter 09 Heredity and Evolution
CBSE Class 10 Biology Heredity And Evolution Set D

Chapter 11 The Human Eye and The Colourful World CBSE Class 10 Science Worksheet

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