741: Which of the following adds/add nitrogen to the soil?
1. Excretion of urea by animals
2. Burning of coal by man
3. Death of vegetation
Select the correct answer using the codes given below.
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
742: The characteristic feature of virus is that
(a) It is made of fats.
(b) It multiplies only on dead animals.
(c) It multiplies only on hosts.
(d) It lacks chlorophyll.
743: Assertion (A) :
The frequency of floods in North Indian plains has increased during the last couple of decades.
Reason (R) :
There has been reduction in the depth of river valleys due to deposition of silt.
(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
744: Which one of the following is not a digestive enzyme in the human systems?
(a) Trypsin
(b) Gastrin
(c) Yellow and violet
(d) Indigo and yellow
745: Consider the following statements:
1. There are 25 High Courts in India.
2. Punjab, Haryana and the Union Territory of Chandigarh have a common High Court.
3. National Capital Territory of Delhi has a High Court of its own.
Which of the following statements given above is/are correct?
(a) 1 and 2
(b) 2 and 3
(c) 3 only
(d) 1, 2 and 3