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  • Class 8 Science Study Material

An Educational platform for Preparation and Practice Class 8. Kidsfront provide unique pattern of learning Science with free online comprehensive study material in the form of QUESTION & ANSWER for each Chapter of Science for Class 8. This study material help Class 8, Science students in learning every aspect of Reaching the Age of Adolescence. Students can understand Reaching the Age of Adolescence concept easily and consolidate their learning by doing Online Practice Tests on Science,Reaching the Age of Adolescence chapter repeatedly till they excel in Class 8, Reaching the Age of Adolescence. Free ONLINE PRACTICE TESTS on Class 8, Reaching the Age of Adolescence comprise of Hundreds of Questions on Reaching the Age of Adolescence, prepared by the highly professionals team. Every repeat test of Reaching the Age of Adolescence will have new set of questions and help students to prepare themselves for exams by doing unlimited Online Test exercise on Reaching the Age of Adolescence. Attempt ONLINE TEST on Class 8,Science,Reaching the Age of Adolescence in Academics section after completing this Reaching the Age of Adolescence Question Answer Exercise.


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Reaching the Age of Adolescence
The number of pairs of chromosomes in human cells is

a) 21
b) 22
c) 23
d) 24



Answer
Solution
Correct Answer Is : 23
Solution Is : Chromosomes are the thread like structures that contain information about an individual. In humans, each cell contains 23 pairs of chromosomes.
End of menstruation is called

a) Puberty.
b) Menarche.
c) Menopause.
d) Adolescence.



Answer
Solution
Correct Answer Is : Menopause.
Solution Is : Menstruation is a regular flow of blood from uterus. It starts at the start of puberty. Start of flow is called menarche and end of the flow of blood is called menopause.
Adolescence begins around the age of

a) 8-9 years.
b) 11-12 years.
c) 13-14 years.
d) 15-16 years.



Answer
Solution
Correct Answer Is : 11-12 years.
Solution Is : Adolescence is the stage of life cycle when changes come in the body of the individual. It begins around the age of 11-12 years.
Adolescence lasts upto the age of

a) 18-19 years.
b) 21-22 years.
c) 23-24 years.
d) 25-26 years.



Answer
Solution
Correct Answer Is : 18-19 years.
Solution Is : Adolescence is the stage of life cycle when changes come in the body of the individual. It begins around the age of 11-12 years and ends at the age of 18-19 years.
Organs that secrete estrogen are

a) Testes.
b) Ovaries.
c) Pituitary glands.
d) Adrenals.



Answer
Solution
Correct Answer Is : Ovaries.
Solution Is : Estrogen is the hormone secreted by ovaries in females. Estrogen helps in the development of ova in females.
After puberty, boys and girls become capable of

a) Respiration.
b) Marriage.
c) Reproduction.
d) Excretion.



Answer
Solution
Correct Answer Is : Reproduction.
Solution Is : During puberty, changes occur in the structure and function of reproductive system that finally makes an individual capable of reproduction.
The percentage of girls who gain their full height at the age of 15 is

a) 90%.
b) 95%.
c) 98%.
d) 99%.



Answer
Solution
Correct Answer Is : 99%.
Solution Is : The increase in the height of a person occurs because of the growth of bones, upto a particular age.
With respect to growth in man the

a) Rate is
b) Height depends entirely on the nutritional status.
c) Growth takes place
d) Puberty occurs at 12-14 years.



Answer
Solution
Correct Answer Is : Puberty occurs at 12-14 years.
Solution Is : Growth takes place during the stage of adolescence. It varies from person to person and also from part to part. The height attained by an individual depends on the genes inherited from the parents and environmental factors. The physical changes which prepare the body for reproduction occur at the age of 12-14 yrs.
The statement that is false is that

a) Drugs are addictive.
b) Drugs harm our body.
c) Drugs ruin health and happiness
d) Drugs should be used by everyone.



Answer
Solution
Correct Answer Is : Drugs should be used by everyone.
Solution Is : Drugs are harmful to the health of a person. So, these should not be taken without medical advice.
Voice boxes in boys are

a) Larger than voice boxes in females.
b) Smaller than voice boxes in girls.
c) Equal in size to the voice box of girls.
d) Very big in size.



Answer
Solution
Correct Answer Is : Larger than voice boxes in females.
Solution Is : During adolescence, there is increase in the size of the voice box. The increase in size is more in boys; hence, voice box of boys are larger than the voice box of girls.