Science Assertion - Reasoning (1 Marks)

Assertion (A): Colour of copper sulphate solution changes when an iron nail is kept immersed in it.
Reason (R): The colour of copper sulphate solution changes when iron nail is kept immersed in it due to the decomposition reaction taking place between iron and copper leading to formation of iron sulphate.

Assertion (A): During fertilization, the only head of the spermatozoa enters the egg.
Reason (R): If several spermatozoa hit the egg at the same time, all can enter the egg.

Assertion (A): A compass needle is placed near a current-carrying wire. The deflection of the compass needle decreases when the compass needle is displaced away from the wire.
Reason (R): Strength of a magnetic field decreases as one moves away from a current-carrying conductor.

Assertion (A): Decomposers help in recycling of nutrients between living and non-living components of ecosystem.
Reason (R): Decomposers help in decomposing dead bodies of organisms and return various nutrient elements to their source viz soil, water and air.