Day 20: CBSE Class 10 Science

1. A.
   they reproduce sexually.
2. B.
   they are unicellular.
3. C.
   they are multicellular.
4. D.
   they reproduce asexually.

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1. A.
   doubling of chromosomes after zygote formation.
2. B.
   halving of chromosomes after zygote formation.
3. C.
   doubling of chromosomes before gamete formation.
4. D.
   halving of chromosomes at the time of gamete formation.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Diarrhoea
2. B.
   AIDS
3. C.
   Gonorrhoea
4. D.
   Wart

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