521: Arrange the following in descending order of their life spans
A. Elephant
B. Horse
C. Tiger
D. Wolf
(a) A, B, C, D
(b) A, C, B, D
(c) C, A, B, D
(d) D, A, B, C
522: Which one of the following is the correct sequence in respect of the Roman numerals - C, D, L and M?
(a) M > D > C > L
(b) C > D > L > M
(c) M > L > D > C
(d) L > C > D > M
523: Which of the following practices can help in water conservation in agriculture?
1. Reduced or zero tillage of the land
2. Applying gypsum before irrigating the field
3. Allowing crop residue to remain in the field
Select the correct answer using the code given below :
a. 1 and 2 only
b. 3 only
c. 1 and 3 only
d. 1, 2 and 3
524: Which one of the following plants can fix nitrogen from air?
(a) Rice
(b) Wheat
(c) Pea
(d) Maize
525: The cure for which of the following diseases exists?
(a) Blood cancer
(b) Hepatitis-B
(c) Breast Cancer
(d) Lung Cancer