861: What can be the impact of excessive / inappropriate use of nitrogenous fertilizers in agriculture?
1. Proliferation of nitrogen-fixing microorganisms in soil can occur.
2. Increase in the acidity of soil can take place.
3. Leaching of nitrate to the ground-water can occur.
Select the correct answer using the code given below.
(a) 1 and 3 only
(b) 2 only
(c) 2 and 3 only
(d) 1, 2 and 3
862: In India people suffer from Anaemia due to lack of:
(a) Iron
(b) Iodine
(c) Calcium
(d) Potassium
863: Which one of the following types of micro-organisms is most widely used in industries ?
(a) Bacteria
(b) Bacteria and fungi
(c) Bacteria and algae
(d) Bacteria, micro-algae and fungi
864: Which number does not fit in the series
0, 1, 3, 6, 10, 15, 21, 28, 37, 45
(a) 0
(b) 21
(c) 37
(d) 45
865: Rennin and lactase, the enzymes required to digest milk, disappear in the human body by the age of
(a) two
(b) three
(c) five
(d) eight