These are the question's which i am doubts ... please type the answer for these questions so that it would be helpful for me....please take it as serious matter and reply for these questions ... PHYSICS:- 1) What do you mean by lateral displacement? 2) What is the cause of dispersion of light? 3) What makes bees respond to ultraviolet rays? 4) Name the liquids that keeps our eye soft? 5) Show that the mirror formula holds good for a plane mirror? 6) Why chickens stroll only during noon while they go back early in the evening? 7) What is mean by illumination ? 8) Define the scattering of light? BIOLOGY:- 1) The PH range most conductive for life of freshwater plants and animals is (i) 6.5 - 7.5 (ii) 2.0 - 3.5 (iii) 3.5 - 5.0 (iv) 9.0 - 10.5 2) What would be the advantage of exploiting resources with long term aim? 3) What is the objective of Ganga action plane? 4) Red data book provides the list of (a) Protected animals (b) Rear animals for milk (c) entrap animal (d) Both (a) & (b) 5) Write any two ways of energy flow through on ecosystem? 6) Why is pond self sustaining unit while an aquarium may not be? Justify the answer. 7) What will be the impact on ecosystem if bacteria and fungi are removed from the environment? 8) Name any two environment friendly practices? 9) What is being done to avoid ozone depletion? 10) Describe any five modes of disposal of wastes? 11) Ecology is the study of interaction of ______________ with other and their surroundings. 12) De composers are also called as __________________. 13) Water , air, light,and temp. are the examples of _____________ components. 14) Give an example of bisexual flower what is its female reproductive part known as. 15) Pollination may occur without fertilization but fertilization will not take place pollination. Give reason? 16) Define :- (i) Fragmentation (ii) Vegetative Propagation. 17) Advantages and Disadvantages of Vegetative Propagation ? 18) Explain Tissue Culture? 19) Write the differences between Binary fission and Multiple Fission in a tabular form as observed in cells of organism? 20) List any four characteristics of Good fuel? 21) List the sexual transmitted diseases (i) Bacterial infection. 22) Explain the term (i) Speciation (ii) Natural selection. 23) Explain how equal genetic contribution of male and female parents is ensured in the progeny?

We are providing answers for few of your questions. For rest, you can refer to the study material of the chapter.



Consider the following figure of a ray of light passing through a glass slab.

We know that light always travels in straight line , but here we see that while entering and exiting the glass slab , the ray of light bends twice.

Though the angle which the emerging ray of light makes with the normal is same as the angle of incidence, we find that the light is no more travelling in a straight path and the incident ray and emerging ray are parallel to each other.

Here we say that the incident ray has been laterally displaced.


Dispersion of light occurs in prism because light rays deviate while coming out of a prism by an angle. This is called the angle of deviation. Now angle of deviation depends upon the refractive index of the medium of which the prism is composed. Now since different colors in the white light have got different refractive index. thus each color deviates by different angle from the other. Thus, these constituent colors separate out.



16 i. It is a form of asexual reproduction in which an entirely new organism is formed from a fragment of the parent. It occurs in multicellular organisms, whose body organization is fairly simple such as annelids, starfish, fungi, lichens, and some algae such as spirogyra. The filaments of spirogyra, upon maturation, break into small pieces or fragments, which grow into new individuals.


Vegetative propagation is a mode of asexual reproduction in plants where the vegetative parts such as roots, leaves, stems, etc. are used to propagate the plants.

Natural vegetative propagation through roots occurs in Asparagus, Albizzia; through leaves occurs in Bryophyllum, ; through modified stem occurs in Onion, potato, ginger, etc.

Artificial vegetative propagation occurs through Cutting (eg Rose), Layering (eg Jasmine), Grafting (eg Sugarcane).







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1) we know that refraction occur when the speed of light changes ,when its travles one medium to anothjer , n when its travles from rarer to denser medium then its speed slow down and move bend towards normal thus the distance by which  the light has been displaced after the bending  through a glass slab is called lateral  displacmant

hope that helps u

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  1. Refraction occurs when the speed changes when the lights travels from one medium to another medium. If the light travels from a medium to a denser medium, the light slows down and consequently is refracted towards the normal.thus the distance by which the light has been displaced after its binding thru a glass slab is known as lateral displacement If the light travels from one medium to a less dense medium, the speed increases and as a result, the light is refracted away from the normal.
    according to Snell's law.....refractive index is the ratio of sine of angle of incidence to the sine of angle of refraction.
  2. The cause of dispersion of light is due to the different speeds by which the different constituents of light travel in a dense medium.It is also caused due to the different wavelengths of the constituents of light,causing different speeds in the dense medium.
  3. the retinal cones of bees are very sensitie.its even sensitive to uv light..
  4. aques and vitreous humour..
  5. -
  6. thier
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cont of 6...

the cones in chicks are very sensitive to bright light.

7.something that lights up .It is also an old term for letters, words, pages and books that are hand decorated in bright colours, gold and fancy pen work.

8.When electromagnetic radiation passes through matter, most of the radiation continues in its original direction but a small fraction is scattered in other directions. Light that is scattered at the same wavelength as the incoming light is called Rayleigh scattering.

hope it helps.....

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