836: At which stage in its life-cycle does the silkworm yield the fibre of commerce?
(a) Egg
(b) Larva
(c) Pupa
(d) Imago
837: Consider the following pairs:
Medieval Indian State : Present Region
1. Champaka : Central India
2. Durgara : Jammu
3. Kuluta : Malabar
Which of the above pairs is / are correctly matched?
(a) 1 and 2
(b) 2 only
(c) 1 and 3
(d) 1 and 3 Only
838: Assertion (A) :
In human beings, the females play a major role in determining the sex of the offspring.
Reason (R) :
Women have two - X chromosomes.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
839: The chemical used as a 'fixer' in photography is
(a) sodium sulphate
(b) sodium thiosulphate
(c) ammonium persulphate
(d) borax
840: Assertion (A): The percentage of net sown area in the total area of Andhra Pradesh is less as compared to that of West Bengal.
Reason (R) : The soil of most of Andhra Pradesh is laterite
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true