Give reasons :

(a) Every room in the house should get direct sunlight at least for a short time.

(b) Tinned and sealed food is not always safe to eat.

(a) Direct sunlight contains ultraviolet radiations of the Sun, which help in killing of mould spores present in air. Hence, it is advised that every living room in the house should get direct sunlight at least for a short time.

(b) No, tinned and sealed food are not always safe to eat as it may contain harmful bacteria like Clostridium botulinum that causes food poisoning. Clostridium botulinum releases toxins under low-oxygen conditions. These toxins are very lethal and can block nerve functions leading to muscular and respiratory paralysis.
Moreover, the chemicals used in the inner coating of the container can be harmful for humans.