171: 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
172: In which one of the following kinds of organisms is the phenomenon found wherein the female kills the male after copulation?
(a) Spider
(b) Honeybee
(c) Dragonfly
(d) Pit viper
173: 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
174: A free-floating astronaut A pushes another free-floating astronaut B in space. The mass of A is greater than that of B. The force exerted by the astronaut A on the astronaut B will be:
(a) Equal to zero.
(b) Equal to the force exerted by B on A.
(c) Greater than the force exerted by B on A.
(d) Less than the force exerted by B on A
175: Consider the following statements about the European Union :
I. The European Union was known earlier as the European Community.
II. The Single European Act (1986) and the Maastricht Treaty were milestones in its formation.
III. Citizens of European Union countries enjoy dual citizenship.
IV. Switzerland is a member of the European Union.
Which of the above statements are correct ?
(a) II and IV
(b) I and III
(c) III and IV
(d) I, II and III