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प्रश्न
What are the changes seen in girls at the time of puberty?
उत्तर १
The changes seen in girls at the time of puberty are:
- Increase in breast size and darkening of the skin of the nipples present at the tips of the breasts.
- Appearance of hair in the genital area. Appearance of hair in other areas of skin like underarms, face, hands, and legs.
- Increase in the size of the uterus and ovary.
- Beginning of menstrual cycle.
- More secretion of oil from the skin, which results in the appearance of pimples.
उत्तर २
Girls at puberty develop hair in their armpits and around the pubic region. The mammary glands develop and become large. The hips get broadened and extra fat gets deposited on various parts of the body. The ovaries start releasing eggs; the vagina enlarges and menstruation starts.
APPEARS IN
संबंधित प्रश्न
Explain how the embryo gets nourishment inside the mother’s body.
State the main function of the Leydig cells
Where is the female gamete formed in humans?
What are the female sex cells in humans called?
Which part of the human body produces ova?
Write the names of female sex hormones.
What is puberty? Who attains puberty at an earlier age in human beings : male or female (boy or girl)?
The diagram shows female reproductive system. Name the parts labelled A to D.
(a) In which part do the sperms enter?
(b) Which part releases the egg?
(c) In which part does fertilisation take place?
(d) In which part does the foetus develop?
What changes are seen in boys at the time of puberty?
Fertilisation results immediately in the formation of :
(a) a zygote
(b) an embryo
(c) a placenta
(d) a foetus
The diagram below represents two reproductive cells A and B. Study the same and then answer the questions that follow:
 |
- Identify the reproductive cells A and B.
- Name the specific part of the reproductive system where the above cells are produced.
- Where in the female reproductive system do these cells unite?
- Name the main hormones secreted by the (1) ovary (2) testes.
- Name an accessory gland found in the male reproductive system and state the function of its secretion.
Draw a diagram of human female reproductive system and label the part.
(i) That produces eggs.
(ii) Where fusion of egg and sperm take place.
(iii) Where zygote is implanted.
What happens to human egg when it is not fertilized?
In male and female reproductive system of human, ______ gland is same.
Choose the correct answer:
The aim of sexual reproduction _________
Define the following:
Parthenogenesis
Define the following:
Gestation
Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the term in Column ‘II’ with a suitable idea given in Column ‘I’.
| Column I | Column II |
| (i) Acrosome
(ii) Ovulation (iii) Sperm (iv) Menopause (v) Implantation (vi) Fertilization (vii) Contraception in males |
(a) Male gamete
(b) Oviduct (c) Uterus (d) Spermatozoa (e) Progesterone (f) Stoppage of the menstrual cycle (g) Sudden change in genes |
Choose the Odd One Out:
The mature sperms are stored in the ____________.
______ is a lytic enzyme released by the sperm.
