Day 44: CBSE Class 10 Science

1. A.
   $\mathrm{Pb}$
2. B.
   $\mathrm{Cu}$
3. C.
   $\mathrm{Ag}$
4. D.
   $\mathrm{Al}$

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1. A.
   Small aquatic plants
2. B.
   Human beings
3. C.
   Small fish
4. D.
   Large fish

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1. A.
   Food web
2. B.
   Ecosystem
3. C.
   Ecological pyramid
4. D.
   Food chain

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1. A.
   Ozone is a molecule formed by three atoms of oxygen.
2. B.
   Ozone shields earth’s surface from harmful infrared radiations.
3. C.
   CFC’s are linked to decline of $\mathrm{O_3}$ layer in our atmosphere.
4. D.
   Ozone at higher levels is a product of UV radiations acting on oxygen molecule.

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