NCERT Solution for Class 10 Science Chapter 8
How do Organisms Reproduce?
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-140
Questions No-3
What are the changes seen in girls at the time of puberty?
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Secondary sexual characteristics in girls:
• Increase in breast size and darkening of 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 uterus and ovary.
• Beginning of menstrual cycle.
• More secretion of oil from the skin, which results in the appearance of pimples.
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At the time of puberty, secondary sexual characters develop and sexual maturity takes place. This is manifested by many changes in both girls and boys. Some of the changes seen in girls at the time of puberty are as follows:
a) Voice becomes thin
b) Breasts enlarge
c) Hips become rounded
d) Hairs grow under the armpit and in pubic area
The various changes occur in girls at puberty are :
Changes seen in girls at the time of puberty are:
(i) Mammary glands develop and increase in size.
(ii) Menstruation starts.
(iii) Hairs grow in armpits and pubic regions.
(iv) Extra fat deposited in thighs and hips and in other body parts.
Puberty is a period of rapid physical and physiological changes that lead to sexual maturity. These changes are triggered by hormonal signals from the brain, particularly the release of gonadotropin-releasing hormone (GnRH), which stimulates the production of sex hormones. In girls, the onset of puberty usually occurs between the ages of 8 and 13, although it can vary.
The changes seen in girls at the time of puberty include:
1. Development of Breast Tissue (Thelarche): One of the early signs of puberty in girls is the development of breast buds, which is the beginning of breast development. This usually occurs around the age of 9 to 11.
2. Growth Spurt: Girls experience a rapid growth spurt during puberty, typically occurring between ages 10 and 14. The growth plates in the long bones of the body become active, leading to an increase in height.
3. Pubic Hair Growth (Pubarche): Pubic hair begins to grow in the genital area. This is usually followed by the growth of hair in the underarm area.
4. Menstruation (Menarche): Menstruation, or the onset of the menstrual cycle, is a significant milestone in puberty. Menarche usually occurs between the ages of 9 and 16, with the average age being around 12.5. Menstruation is a sign that the reproductive system is maturing, and it typically follows the development of breast tissue and the growth of pubic hair.
5. Hormonal Changes: The ovaries begin to release eggs as part of the menstrual cycle, and there is an increase in the production of estrogen and progesterone, the primary female sex hormones.
6. Widening of Hips: The pelvis gradually widens to prepare for potential childbirth. This contributes to a more feminine body shape.
7. Changes in Skin: Increased oil production may lead to changes in skin texture. Acne is common during puberty due to hormonal fluctuations.
8. Emotional and Psychological Changes: Puberty is not just about physical changes; there are also emotional and psychological changes. Hormonal fluctuations can contribute to mood swings, and girls may experience an increased interest in relationships and sexuality.
It’s important to note that the timing and sequence of these changes can vary widely among individuals. Puberty is a unique and individualized process, and not all girls will experience these changes at the same rate or in the same order. Additionally, the age of onset of puberty can be influenced by genetic and environmental factors. If there are concerns about the timing or progression of puberty, it’s advisable to consult with a healthcare professional.