Practice Paper
Subject Biology (2019)
Class VIII Ch-REACHING THE AGE OF ADOLESCENCE
- Why should teenagers take a bath at least once everyday?
- What are chromosomes?
- What is the period of adolescence?
- What do you understand by the term adolescence?
- When does the puberty end?
- What causes increase in height of the person during puberty?
- Why is it necessary to eat right kind of food during the growing years?
- What is the other name for voice box in males?
- Why does the voice of boys become hoarse during the age of adolescence?
- How many pairs of chromosomes are there in the cells of human beings?
- What determines the sex of an unborn baby?
- Why is iron necessary for the body?
- Name the male and female hormones that are secreted at the onset of puberty
- What is the function of mammary glands?
- Name the gland whose secretion control the secretion of sex hormones.
- Name the hormone that causes metamorphosis in frogs.
- What will be the sex of the individual with sex chromosomes as XY?
- What is the period of reproductive phase in females?
- What are the differences between menarche and menopause?
- What is menstruation?
- Why endocrine glands are called ductless glands? Give two examples.
- A girl is 13 years old and 135 cm tall. At the end of growth period how much tall will she be?
- What is the difference between the voice of a girl and a boy? Why this happens?
- What is the importance of adrenal glands in humans?
- Write the causes of: (a)Diabetes(B)Goiter
- What mental changes occur during puberty?
- Why a girl should not become pregnant during teenage?
- Why young people get acne and pimples during puberty?
- How do hormones act to bring about onset of puberty?
- List three secondary sexual characters of boys and girls?
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