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Solutions ⇒ Class 8th ⇒ Science ⇒ 10. Reaching the age of adolescence

Solutions 10. Reaching the age of adolescence - Chapter Review | Class 8 Science - Toppers Study

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Solutions 10. Reaching the age of adolescence - Chapter Review | Class 8 Science - Toppers Study

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Chapter 10 Science class 8

Chapter Review class 8 Science Chapter 10. Reaching the age of adolescence

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  • Solutions 10. Reaching The Age Of Adolescence - Chapter Review | Class 8 Science - Toppers Study
  • Class 8 Ncert Solutions
  • Solution Chapter 10. Reaching The Age Of Adolescence Class 8
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  • Chapter 10. Reaching The Age Of Adolescence Chapter Review Class 8

10. Reaching the age of adolescence

| Chapter Review |

Solutions 10. Reaching the age of adolescence - Chapter Review | Class 8 Science - Toppers Study


Chapter Review:

  • Growing up is a natural process. The period of life, when the body undergoes changes, leading to reproductive maturity, is called adolescence.

  • The human body undergoes several changes during adolescence. These changes mark the onset of puberty.

  • The period covers the ‘teens’ (13 to 18 or 19 years of age), adolescents are also called ‘teenagers’.

  • Height depends on the genes inherited from parents.

  • During puberty the secretion of sweat glands and sebaceous glands (oil glands) increases.

  • Endocrine glands release hormones directly into the bloodstream. So, they are also termed ductless glands.

  • In girls, breasts begin to develop at puberty and boys begin to grow facial hair, that is, moustaches and beard.

  • The changes which occur at adolescence are controlled by
    hormones. 

  • The male hormone is testosterone and the female
    hormone is estrogen.

  • Development of sexual organ as well as they produce sperm and ovum. In girls, breasts begin to develop at puberty and boys begin to grow facial hair, that is, moustaches and beard. Hair grows under the arms and in the region above the thighs or the pubic region.

  • The ovary releases eggs for fertilization. If fertilisation does not occur, the released egg, and the thickened lining of the uterus along with its blood vessels are shed off. This causes bleeding in women which is called menstruation.

  • Testes and ovary are even exocrine glands, which secrete sex hormone. These are responsible for secondary sexual characters  so these are called sex hormones. The sex hormones are under the control of hormones from pituitary gland.

  • The chromosomes which determine the sex in the human beings are called sex- chromosomes. These are two ane is ‘X’ and another ‘Y’. A female has two X chromosomes, while a male has one X and one Y chromosome.     

  • First The first menstrual flow begins at puberty and is termed menarch .

  • At 45 to 50 years of age, the menstrual cycle stops. Stoppage of menstruation is termed menopause.

  • The reproduction period in lady Starts in age of 10 – 12th  years and ends in age of 40 – 45th

  • Endocrine glands release hormones into the bloodstream to reach a
    particular body part called target site.

  • The growing voice box in boys can be seen as a protruding part of the throat called Adam’s apple.

  • Pituitary also secretes growth hormone which is necessary for the normal growth of a person.

  • All human beings have 23 pairs of chromosomes in the nuclei of their cells.

  • A female has two X chromosomes, while a male has one X and one Y chromosome.

  • This change from larva to adult is called metamorphosis.

  • Metamorphosis in insects is controlled by insect hormones. In a frog, it is controlled by thyroxine, the hormone produced by thyroid.

  • A balanced diet means that the meals includs proteins,carbohydrates,fats and vitamins in requisite proportions.

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Study Materials List:

Solutions ⇒ Class 8th ⇒ Science
1. Crop Production And Management
2. Microorganisms : Friend And Foe
3. Synthetic Fibres And Plastics
4. Materials : Metals And Non-Metals
5. Coal And Petroleum
6. Combustion And Flame
7. Conservation of Plants And Animals
8. Cell - Structure and functions
9. Reproduction in animals
10. Reaching the age of adolescence
11. Force And Pressure
12. Friction
13. Sound
14. Chemical Effects of Electric Current
15. Some Natural Phenomena
16. Light
17. Stars And The Solar System
18. Pollution of Air and Water

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