During Sunbath the body colour is changed.
a) Why the body colour is changed?
b) Do you think any hormone is responsible forthis?If so, name the hormone.
c) Explain the action of homone.

Take some CuSO_4 solution in a beaker Dip a iron rod in it: After sometime, colour change is observed. a) Write the name of reaction. b) Explain the reaction. c) Write the chemical equation.

When checked the blood sugar of a person, it is found to be 220 mg/100ml of blood, Is this a disorder? a) If this is a disorder, name the disorder. b) Which hormonal imbalance is responsible forthis condition? c) Can you suggest any remedial measuresto get rid of?

A boy witnessed an accident on his way to school. Following changes occurred in him. (Increased heart beat, profuse sweating, pupils dilated, shivering, pale face, increased respiration) a) Name the hormone responsible for these changes? b) Name the gland which secretes this hormone?

Suppose you dramatically escaped from a motor accident. Your heart beat and rate of respiration was increased at that moment. a) Name the hormone involved in this change. b) Which part of nervous system control these action? c) Enlist other physiological changes that you may feel at that time.

Answer briefly , a) How do you preceive the colour of an object ? b) Which part of our body helps us in maintaining the body balance ? c) How does the eye regulate the amount of light that falls on the retina.

A student is doing an experiment in the laboratory using sodium. Suddenly, a piece of sodium falls into liquid ammonia. (a) What changes can you observe in liquid ammonia? (b) What is the reason for the change? (c) If the solution is kept for a long time it is changed into bronze colour. Why?