136: Turmeric is obtained from which part of the plant?
(a) Fruit
(b) Stem
(c) Root
(d) Flower
137: Which one of the following metals does not form amalgams ?
(a) Zinc
(b) Copper
(c) Magnesium
(d) Iron
Explanation:
An Amalgam is a compound formed by combination of Metal + Mercury. In this case, all but Iron don't form amalgam.
138: 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
Explanation:
Statement 1 is not possible, Increasing the amount of nitrogen based fertilizer does not lead to more micro-organisms in the field.
Statement 2 and 3 are correct.
Hence answer is C
139: Which one of the following polymers is widely used for making bullet proof material ?
(a) Polyvinyl chloride
(b) Polyamides
(c) Polyethylene
(d) Polycarbonates
Explanation:
Polymers widely used for making bullet proof material are polycarbonates which given resistance to a bullet from penetrance.
140: Consider the following statements regarding biomedication. It involves the use of bacteria and fungi to:
1. Clean up aquifers
2. Clean up toxic dumps
3. Clean up oil spills
4. Cure bacterial and fungal disease
(a) 1 and 2 are correct
(b) 1 and 3 are correct
(c) 1, 2 and 3 are correct
(d) 1, 2, 3 and 4 are correct