secondary sexual character.pptx

class 8th science chapter 10

1. SECONDARY SEXUAL CHARACTERS B. Sc. B.Ed. integrated

2. Secondary sexual characters In boys Appearance of moustaches and beard. Growth of hair on the chest, under the arms and pubic area. In girls Development of breasts. The growth of hair under the arms and the pubic area

3. Development of secondary sexual characters Secondary sexual characters are physical changes with starts occurring during adolescence. Hormones are the chemicals substances which are released by the glands. Glands are organs which are assigned to produce the hormones.

4. hormones Characters are initiated by hormones. Hormones are the chemical substances. They are produced by glands. Glands are the organs in your body which are specially assigned to secrete hormones.

5. Endocrine glands Glands which secrete the hormone directly into bloodstream .(ductless) Each hormone has a specific target site. They don’t act upon the whole body.

6. Endocrine gland

7. Pituitary gland

8. Role of hormones

9. .. I f reproductive life, once begun, continues, or it ends sometime. And why?

10. Q uestions Name the hormone in females that is produced by ovaries? Which gland is called master gland?

11. what this picture indicates

12. Reproductive phase Reproductive ………. process of reproduction Phase ………… time period. Female are capable of reproduction only for some period of time.

13. Reproductive phase of life in humans Adolescents become capable of reproduction when their testes and ovaries begin to produce gametes. The capacity for maturation and production of gametes is longer in males. In females, reproductive phase begin at 10 to 12 years & lasts till the age of 45 to 50 years. When females hit puberty, the eggs or ova start getting mature.

14. ,,,, One of the ovaries then releases the mature ovum around 28 to 30 days. The wall of the uterus at this time, when the egg is released, becomes thick to hold the egg in case if fertilization occurs & develops. When the fertilization does not take place, the lining of the uterus sheds along with the egg and the blood vessels. This results in MENSTRUATION .

15. mbh The first menstruation flow occurs at puberty and is called the MENARCHE. The stopping of menstrual cycle in the age between 45 to 50 years is called MENOPAUSE.

16. Organisms aren’t immortal they eventually die. so who will make sure that organisms will still exists in nature a simple and efficient system in us make sure that the species will keep going even after we die .  

17. In female reproduction starts with menarche and stop with menopause.so will it be same in males?

18. ,,, Q. when does the reproduction process of males start and when does it end?

19. State true or false Q. Ovulation occurs at the onset of menstrual cycle.

20. Q uestions following can lead to a menstrual cycle? Fertilization of egg Unfertilized egg. Improper sleep. Study pressure. The first menstrual flow is called as …… Menopause Menstruation Menarche ovulation

21. Do know these sign ? When we use these sign?

22. Paheli: I heard my mother and my aunty talking about my cousin who is going to have a baby. They were discussing whether she would give birth to a boy or a girl. I wonder what makes the fertilized egg develop either into a boy or a girl.

23. Sex determination

24. Can you label it?

25. mm Q. a family of five daughters only is expecting sixth issue. The chance of its being a son is 0% 25% 50% d)100%

26. RECAPITULATION: Explain secondary sexual character. Difference physical appearance between male and female. What is hormone? Define endocrine glands. Explain menstrual cycle and various phases. What are chromosomes?

27. HOME WORK: Q. what are sex hormones? Why are they named so? State their function. Q. draw menstruation cycle. And explain it.