Reaching the Age of Adolescene

Reaching the Age of Adolescene 

Adolescene
The period of life, when the body undergoes changes , leading to reproductive maturity, is called adolescene. 
Period - age of 11 to age of 19.
Also called "teen age". Because this period covers the teen ages i.e, 13 to 19 
Adolescene may begin earlier in girls than boys. 

Puberty
Period during adolescene, when human body undergoes several changes, is called puberty. 
Important change- Boys and girls become capable of reproduction. 

Changes at puberty 
Increase in height 
Change in body shape 
Change in voice 
Increased activity of sweat and sebaceous glands 
Development of sex organs 
Reaching mental, intellectual and emotional maturity

Changes in Girls 
Increase in height
Region below the waist becomes wider 
Less growth of muscles 
Voice becomes high pitched. 
Increased activity of sweat and sebaceous glands
Ovaries enlarge. 
Eggs begin to mature. 
Reaching mental, intellectual and emotional maturity

Changes in boys 
Increase in height
Boys get broader shoulder and wider chest 
Muscles grow more prominently
Voice becomes low pitched 
Increased activity of sweat and sebaceous glands
Testes and penis develop completely
Testes begin to produce sperm. 
Reaching mental, intellectual and emotional maturity

Secondary sexual characters
The characters that distinguish male from female is called secondary sexual characters. 
These are controlled by hormones. 

Reproductive phase 
In female - Puberty to age of 50years 
In male - Puberty to Death. 

Menstruation
Shedding off of released egg, thickened lining of uterus and blood vessels, is called menstruation. 
It occurs once in about 28-30 days. 

Menarche
First menstrual flow at puberty. 

Menopause
Stoppage of menstruation. 



Comments

Post a Comment

Popular posts from this blog

Fibre to Fabric NCERT CBSE CLASS 7 Science Online Test/Quiz

Fibre to Fabric  NCERT CBSE Class 7 Online Test/Quiz for Fibre to Fabric  Online test for "fibre to fabric" consists of ten questions, all having four alternatives. You have to choose the correct option. After attempting all questions, enter your name, class, roll no and email id. Email id is asked because through that results will be share to you.  And at last don't forget to submit your answers. After submission you can see your results too.  Enjoy taking test.  Topic- Fibre to Fabric NCERT CBSE Science Class 7 Loading…
Read more

Light NCERT Science Class 8 Summary Note

Image
What Makes Things Visible   When light from an object enters our eyes, then we see the object.  The light may have been emitted or reflected by the object.  Mirror   Highly polished surface is called mirror.  Reflection Bending back of light ray after falling on a surface, is called reflection.  Incident ray The light ray which strikes any surface, is called incident ray.  Reflected ray  The ray that comes back from the surface after reflection, is called as reflected ray.  Normal Line perpendicular to surface at point of incidence of light ray, is called normal.  Angle of incidence The angle between normal and incident ray, is called angle of incidence.  Angle of reflection The angle between normal and reflected ray, is called angle of reflection.  Laws of reflection (i) The incident ray, the normal at the point of incidence and the reflected ray, all lie in the same plane.  (ii) The angle of incidence is always equal to the angle of reflection.  Nature of Images formed by Plane Mirro
Read more

Chemical Effects of Electric Current NCERT Summary Class VIII Science Chapter 14

Image
Good Conductor The substance through which electricity can pass is called good conductor.  Examples - Copper, Aluminum Poor conductor The substance through which electricity can not pass is called poor conductor. Examples - Rubber, plastic etc.  Tester A device that test conductance of a substance, is called tester.  Solutions of acids, bases and salts are generally good conductor.  Chemical effects of Current Chemical reactions (effects) caused when electricity passes through a conducting liquid, is chemical effects of current.  How to recognize chemical reaction - Release of gas - Change of colour of solution - Release of heat - Formation of new substance In battery No. of terminals- 2 (positive and negative)  Positive terminal is also called Anode .  Negative terminal is also called cathode .  Solution  is called electrolyte .  Passing current through a solution What happens when electricity is passed through c
Read more