Page 112 - Science Class 08
P. 112
The sex of the body depends on the kind of Personal Hygiene
sperm by which an egg is fer lised. You already know that, at the age of puberty,
If the X chromosome of a man fes lises the egg sweat glands and oil glands become more
of a woman, a girl baby is born. ac ve. They make the body smelly. Therefore,
If the Y chromosome of a man fer lises the egg boys and girls should take proper bath
of a woman, a boy baby is born. everyday. They should wash every body parts
Hormones are also responsible for the growth properly everyday. Girls should take proper
in the body of insects and frogs. The change care of cleanliness during the me of menstrual
from a larva of a silk-moth to adult is called flow. Due to the lack of personal hygiene one
metamorphosis. Metamorphosis in insects is can get bacterial infec on.
controlled by insect hormones. In a frog, it is Physical Exercise
controlled by thyroxine which is released by Exercise is required for every age group. But, it
thyroid. Thyroxine produc on requires the
becomes important when one reaches his or
presence of iodine in water. If the water is
her puberty. Both boys and girls should take
deficient in iodine, the tadpoles cannot
exercise everyday or they should play an
become adult.
outdoor game. They can atleast take a long
REPRODUCTIVE HEALTH
walk in the morning in fresh air. It will keep
You have studied about the importance of well them fresh and healthy.
being the role of diet and exercise to be
Avoid Drugs
healthy in junior classes. Since, at the age of
Adolescents should avoid drugs frequently to
adolescence the body undergoes many
changes, therefore the importance of balanced overcome the changes taking place in their
diet, personal hygiene and physical exercise body. If necessary, you should consult a doctor
becomes essen al. Let us study about these and act upon his advice. If one starts taking
things in detail. drugs frequently, he or she may become
addic ve. This is not good for health.
Nutri on in Food
As you know, there is a rapid growth in the
body of a boy or a girl during the period of
adolescence. Besides, the body also undergoes
1. Why should we not blame female for her
many changes during this period. Therefore, to
bearing a boy baby or girl baby?
maintain this growth both the boy and the girl
2. What is the role of chromosomes in the
need a balanced diet everyday. A balanced diet
determina on of the sex of an unborn
contains all the nutrients like carbohydrate, fat,
baby?
proteins, vitamins and minerals in well
propor on. It means you should take all kinds 3. Why should we take nutri ous food
during the phase of adolescence?
of food which have nutri onal value. You
should not s ck to some par cular food items. 4. Why should we do physical exercise?
You should not prefer chips or nned snacks,
cold drinks, etc.
112 Science-8
