Science - Class 8 (C ...

Q22. Who attains puberty at an earlier age in human beings: boys or girls?

 

Q23. What is the most conspicuous change during puberty?

 

Q24. What is the legal age for marriage of boys and girls in our country?

 

Q25. How do hips of girls change during puberty?

 

Q26. State the age at which adolescence usually begins and the age up to which it lasts.

Or

At what age adolescence usually begins and up to which it lasts?

 

Q27. Why endocrine glands are called ductless glands?

 

Q28. Which hormone is responsible for metamorphosis in frog?

 

Q29. Which two male sex organs develop completely at puberty?

 

Q30. Which two female sex organs develop completely at puberty?

 

Q31. What is puberty?

 

Q32. What are hormones? Where are hormones made in the human body?

 

Q33. What is the function of adrenalin hormone in the body?

 

Q34. Name the time period in one's life when the brain has the greatest capacity for learning.

 

Q35. Which disease is caused by the insufficient production of insulin hormone by pancreas?

 

Q36. Which endocrine gland secretes hormone that maintains correct salt balance in the blood?

 

Q37. Why is exercise important during adolescence?

 

Q38. What is the effect of a smaller voice box in grown up girls?

 

Q39. Why is iron mineral important for our body? Write some iron rich foods.