Question

7. a)Differentiate between-

i)rolling and sliding friction

ii) real and virtual image

iii)zygote and foetus




answer kya hai kmino btado ​

Answer 1

Question :-

7. a)Differentiate between :-

i)rolling and sliding friction

ii) real and virtual image

iii)zygote and foetus

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Answers :-

(i) Rolling Friction Sliding Friction :-

Rolling Friction :-

1. When the surface of one body is rolling against the surface of another body, rolling friction comes into play.
2. Rolling friction occurs due to deformation of surfaces.

Sliding Friction :-

1. When the surface of one body is sliding against the surface of another body, sliding friction comes into play.
2. Sliding friction occurs due to interlocking between microscopic bumps on surfaces.

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(ii) Real and Virtual Image :-

Real Image:-

1. It can be projected on a screen whereas a real image.
2. It is always inverted.

Virtual Image :-

1. It cannot be projected on a screen.
2. It is always erect.

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(iii) Zygote and Foetus :-

Zygote :-

1. Zygote is the result of fertilization, it is the fusion of male and female gamete.
2. It is unicellular in nature.  

Fetus :-

1. Zygote undergoing multiple cellular division and reaching a stage where it starts resembling a human structure is called a foetus.
2. It is multicellular in nature.

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