The reproduction and endocrine system chapter discusses all the stages of life. Like what happens when the body gets matured?
Meaning of Adolescence:
Adolescence is the period of life transition when the body suffers many changes, leading to reproductive maturity.
- WHO defines the adolescence period.
- And this period lies between 11-19 years old.
- The human body suffers from many changes.
- Such changes lead to the action of puberty.
What is puberty?
We can say that puberty is a phase:
- When the reproductive organs work actively.
- The stage gets ended when the adolescent attains maturity.
What are the changes during puberty?
Many changes happen at the time of puberty. LIKE:
- Voice get change
- Height get change
- Emotional aspects
- Mental development
- Body shape get change
Hormones:
- Male hormones: Hormones in males are known as 'testosterone.'
- Female hormones: Hormones for females are known as 'estrogen.'
Zygote:
The zygote is formed with both sperm and fuse. Well, the sex chromosomes of sperm help in doing the determination of the kids' gender.
- There are 23 chromosomes in a human cell.
- Chromosomes pair form 'sex chromosomes.'
- Male chromosomes: XY
- Female chromosomes: XX
Reproduction and Endocrine System Sample Questions for Class 8
Question 1
The maximum height in both girls and boys can ve acheived by the age of ________.
A. 19 - 20 years
B. 15 -16 years
C. 17 - 18 years
D. 18 -19 years
Question 2
Every sperm has ______ sex chromosomes.
A. 1
B. 2
C. 23
D. 0
Question 3
Which change is not common in girls and boys in adolescence age?
A. Increase in height
B. Development of hair
C. Formation of gametes
D. Menstruation cycle
Question 4
In frog, the life cycle is as follows :
A. Egg -> tadpole -> adult frog
B. Egg-> early tadpole->late tadpole -> adult frog
C. Egg-> larva-> tadpole-> adult frog
D. Egg->pupa->tadpole->adult frog
Question 5
External fertilization is seen in _______.
A. Hen
B. Fish
C. Cow
D. Snake