Write True (T) or False (F) for the following statements:

1. Stratum corneum is made of dead cells having keratin.
2. The malpighian layer is hard and resistant to bacterial invasion.
3. The pigment melanin which imparts colouration to the skin is found in the malpighian layer.
4. The dermis is very thick on palms and soles.

Match the items in Column I with those in Column II

How is the outer surface of the skin made waterproof?

The statements given below have some parts printed in bold face. In case these parts are incorrect rewrite these in correct form.

1. All mammals are ectothermal.
2. Hibernation is also known as summer sleep.
3. Human body temperature normally is 98.6°F (37°C).
4. Vigorous activity in a cold day overheats you.
5. The principal heat-regulating centre is located in the thyroid.
6. Increased body heat causes vasoconstriction.
7. Facial hair in humans contributes to sex differences.