2166: Due to some reasons, if there is a huge fall in the population of species of butterflies, what could be its likely consequence/consequences?
1. Pollination of some plants could be adversely affected.
2. There could be a drastic increase in the fungal infections of some cultivated plants.
3. It could lead to a fall in the population of some species of wasps, spiders and birds.
Select the correct answer using the code given below:
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
2167: What would happen if phytoplankton of an ocean is completely destroyed for some reason?
1. The ocean as a carbon sink would be adversely affected.
2. The food chains in the ocean would be adversely affected.
3. The density of ocean water would drastically decrease.
Select the correct answer using the codes given below :
(a) 1 and 2 only
(b) 2 only
(c) 3 only
(d) 1, 2 and 3
2168: Consider the following:
1. Hotels and restaurants
2. Motor transport undertakings
3. Newspaper establishments
4. Private medical institutions
The employees of which of the above can have the 'Social Security' coverage under Employees' State Insurance Scheme?
(a) 1, 2 and 3 only
(b) 4 only
(c) 1, 3 and 4 only
(d) 1, 2, 3 and 4
2169: A person sitting in a bus experiences a jerk, when the bus stops all of a sudden. This is due to:
(a) Law of inertia
(b) Newton's third law of motion
(c) Einstein's law of relativity
(d) None of these
2170: In the given figure, the triangle represents girls, the square represents sports persons and the circle represents coaches. The portion in the figure which represents girls who are sports persons but not coaches is the one labelled
(a) A
(b) B
(c) D
(d) E