What Are the Changes Seen in Girls at the Time of Puberty? - Science


What are the changes seen in girls at the time of puberty?


Solution 1

The changes seen in girls at the time of puberty are:

  •  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.

Solution 2

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.

  Is there an error in this question or solution?
Chapter 3: How do Organisms Reproduce? - Exercise 2 [Page 171]


Lakhmir Singh Class 10 Biology (Science)
Chapter 3 How do Organisms Reproduce?
Exercise 2 | Q 57.1 | Page 171
NCERT Science Class 10
Chapter 8 How do Organisms Reproduce?
Intext Questions | Q 3 | Page 140

Video TutorialsVIEW ALL [1]


Find the odd one out and write it: vagina, uterus, vas deferens, ovary

Explain the process of fertilization in human beings.

Explain the process of development in human beings.

Explain the process of birth in human beings.

Write the functions of the following organs of reproduction:
a. Ovaries
b. Seminal vesicle and prostate glands

Name any three parts of the female reproductive system in human beings. Write one function of each.

List any four methods of contraception used by humans. State in brief two advantages of adopting such preventive methods.

Write the functions of the following parts in a human female reproductive system: Fallopian tube

State the main function of the Leydig cells

A single highly coiled tube where sperms are stored gets concentrated, and mature is known as ______

Match the Column:

no Column A Column B
1 Allele Control of automobile exhaust
2 Leydig cells Tourniquet
3 Utriculus Alternate forms of genes
4 Snake bite Dynamic equilibrium
5 Euro IV norms Testosterone
    Sudden change in genes
    Static equilibrium

Give biological explanations for All the food chains begin with green plants.

Name the liquid that contains sperms.

 For how much time does menstruation last in human females (or women)?

Fill in the following blank with suitable word :

The menstrual cycle is controlled by.............


Mention two functions  of human testes.

Draw a labelled diagram of the human female reproductive system. With the help of this diagram, explain the working of human female reproductive system.

Which one of the following best describes the function of the umbilical cord? It :
(a) feeds the embryo with digested substances.
(b) conveys nutrients and wastes to and from the embryo respectively
(c) removes waste matter from the embryo to the mother's blood.
(d) supplies oxygenated blood from the mother to the embryo.

Write two examples of sexually transmitted diseases caused by bacteri.

Describe in brief the role of ureter in human male reproductive system.

Fill in the blank. 

In humans, sperm production occurs in the organ ----------------. 

Fill in the blank. 

 In humans, ------ chromosome is responsible for maleness. 

Fill in the blank. 

 In male and female reproductive system of human, ------------- gland is same. 

Fill in the blank.

Pollen grains are formed by ______ division in locules of anthers. 

Give the names.

Any two sexual diseases. 

Give the name:

Methods of family planning.

Gender of child is determined  by the male partner of couple. Explain with reasons whether this statement is true or false.

Sketch and label human female reproductive system.
Is the woman responsible for sex-determination of child? Justify your answer.

“Gender of child is determined by the male partner of couple”. Draw a diagram explaining the above statement.

Choose the correct answer:
Fertilization occurs in _____________

Draw a diagram to display the vertical view of human female reproductive system and label the following parts in the diagram:
(1) Ureter
(2) Ovary
(3) Funnel of fallopian tube
(4) Urethra.

Name the following:
Two accessory glands in the male reproductive system.

Define the following:

Define the following:    

The diagram below represents two reproductive cells A and B. Study the same and then answer the question that follow:

Name the main hormone secreted by the (1) ovary (2) testes.

Name the organs of the human male reproductive system and state the functions of any two organs.

Answer the following question:
Why are family planning measures needed in our country?

Rewrite the following terms in a correct and logical sequence:
The luteal phase, follicular phase, menstrual phase, ovulatory phase.

The mature sperms are stored in the ____________.

The male homologue of the female clitoris is ____________.

What is inhibin? State its functions.

Mention the importance of the position of the testes in humans.

What is the composition of semen?

The following is the illustration of the sequence of ovarian events (a-i) in a human female.

Write the difference between C and H.

Reproductive organs are also considered endocrine glands.

If for some reason, the vasa efferentia in the human reproductive system get blocked, the gametes will NOT be transported form ______

Testosterone is produced by:

Distinguish between Vasa efferentia and Vasa deferentia.

Arrange and rewrite the terms in the group in the correct order to be in a logical sequence beginning with the term that is underlined:

Testis, Urethra, Sperm duct, epididymis.


      Forgot password?
Use app×