1961: The minimum land area recommended for forest cover to maintain proper ecological balance in India is
(a) 25%
(b) 33%
(c) 43%
(d) 53%
1962: Mitochondrial DNA in an individual comes from
(a) Male parent
(b) Female parent
(c) Both parents
(d) Neither of the parents
1963: Sparkling red colour after the blast of fire crackers is due to the presence of:
(a) Strontium
(b) Sodium
(c) Sulphur
(d) Magnesium
1964: A, B, C, D, E and F, not necessarily in that order, are sitting in six chairs regularly placed around a round table. It is observed that
1. A is between D and F.
2. C is opposite D.
3. D and E are not on neighbouring chairs.
Which one of the following must be true?
(a) A is opposite B
(b) D is opposite E
(c) C and B are neighbours
(d) B and E are neighbours
1965: Assertion (A) :
To dilute sulphuric acid, acid is added to water and not water to acid.
Reason (R) :
Specific heat of water is quite large.
(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