Reaching the Age of Adolescence - Class 8 - Science
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Back Questions - Reaching the Age of Adolescence | NCERT | Science | Class 8
What is the term used for chemical secretions of endocrine glands responsible for changes taking place in the body?
The term used for chemical secretions of endocrine glands responsible for changes taking place in the body is hormones. These hormones play a vital role in adolescence and puberty, controlling bodily changes and reproductive maturity. They are released from various endocrine glands such as the pituitary gland, testes, ovaries, thyroid, pancreas, and adrenals. Changes at puberty like increase in height, change in body shape, voice change, activity of sweat and sebaceous glands, and development of sex organs are all regulated by these hormones. The male hormone, or testosterone and the female hormone, or estrogen particularly influence the sexual development during puberty.
Define adolescence
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Sign up nowWhat is menstruation? Explain.
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Sign up nowList changes in the body that take place at puberty
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Sign up nowPrepare a Table having two columns depicting names of endocrine glands and hormones secreted by them
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Sign up nowWhat are sex hormones? Why are they named so? State their function.
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Sign up nowChoose the correct option.
(a) Adolescents should be careful about what they eat, because
(i) proper diet develops their brains.
(ii) proper diet is needed for the rapid growth taking place in their body.
(iii) adolescents feel hungry all the time.
(iv) taste buds are well developed in teenagers.
(b) Reproductive age in women starts when their
(i) menstruation starts.
(ii) breasts start developing.
(iii) body weight increases.
(iv) height increases.
(c) The right meal for adolescents consists of
(i) chips, noodles, coke.
(ii) chapati, dal, vegetables.
(iii) rice, noodles and burger.
(iv) vegetable cutlets, chips and lemon drink
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Sign up nowWrite notes on—
(a) Adam’s apple.
(b) Secondary sexual characters.
(c) Sex determination in the unborn baby
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Sign up nowWord game : Use the clues to work out the words.
Across
3. Protruding voice box in boys
4. Glands without ducts
7. Endocrine gland attached to brain
8. Secretion of endocrine glands
9. Pancreatic hormone
10. Female hormone
Down
1. Male hormone
2. Secretes thyroxine
3. Another term for teenage
5. Hormone reaches here through blood stream
6. Voice box
7. Term for changes at adolescence
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Sign up nowThe table below shows the data on likely heights of boys and girls as they grow in age. Draw graphs showing height and age for both boys and girls on the same graph paper. What conclusions can be drawn from these graphs?
Age Years | Boys (Height cm) | Girls (Height cm) |
---|---|---|
0 | 53 | 53 |
4 | 96 | 92 |
8 | 114 | 110 |
12 | 129 | 133 |
16 | 150 | 150 |
20 | 173 | 165 |
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Sign up nowExtra Questions - Reaching the Age of Adolescence | NCERT | Science | Class 8
Reproductive age in women starts when their
menstruation starts.
breasts start developing.
body weight increases.
height increases.
The correct option is:
1. menstruation starts.
This marks the onset of reproductive capability in women, signifying that they have entered the reproductive age.
'Teenagers' is another name used for adolescents.
A. True
B. False
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Sign up nowLong Questions - Reaching the Age of Adolescence | NCERT | Science | Class 8
Describe in detail the process of sex determination in humans. How do the X and Y chromosomes contribute to the determination of the baby's gender?
In the process of sex determination in humans, the sex chromosomes X and Y play a vital role. These chromosomes are present inside the nucleus of every cell. While females have two X chromosomes, males contain one X and one Y chromosome. When the fertilisation process happens, the unfertilised egg or ovum always contributes an X chromosome. However, sperm are of two kinds; one has an X chromosome, and the other kind possesses a Y chromosome.
If a sperm carrying an X chromosome fertilises the egg, the resulting zygote will possess two X chromosomes and will develop into a female child. Conversely, if the sperm contributes a Y chromosome, the zygote will develop into a male child. Therefore, the sex of a baby is determined by the type of sperm that fertilises the egg. Hence, it can be stated that the sex chromosomes of the father are ultimately responsible for the sex of an unborn baby.
Explain the process of the menstrual cycle. How do hormones regulate this cycle and what are the phases it includes?
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Sign up nowShort Questions - Reaching the Age of Adolescence | NCERT | Science | Class 8
What is the role of hormones in bringing about changes in an adolescent's body?
Hormones play a crucial role in transforming a child's body into an adult body during adolescence. They are responsible for the onset of puberty, sparking changes related to growth, mood, and sexual development. Specifically, the male hormone or testosterone, produced by the testes in boys, and the female hormone or estrogen, produced by ovaries in girls, initiate changes such as the growth of facial hair, development of breasts, and the starting of menstrual cycle in girls. These changes signify the body's readiness for reproduction.
At what age does adolescence usually begin and end?
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Sign up nowWhat factors can influence the height of an adolescent?
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