SHORT ANSWER TYPE
Why do you shiver and why do your teeth chatter when it is very cold in winter ?

Q. Give suitable explanations for the following:
Why do you shiver and why do your teeth chatter when it is very cold in winter?

Q. Give suitable explanations for the following:
(a) Breathing through the nose is said to be healthier than through the mouth.
(b) Why does gaseous exchange continue in the lungs even during expiration?
(c) Why does a person feel breathlessness at higher altitudes?
(d) Why do you shiver and why do your teeth chatter when it is very cold in winter?

Q. Very Short Answer Question.
What do you mean by 'market'?

Q. Very Short Answer Questions
What do you mean by labelling?

Q. Have you ever felt —
(a) Your teeth chattering with cold? Yes/No
(b) Your feet burning on walking barefoot? Yes/No
(c) Name one month when you can easily walk barefoot. _________________________