Describe in Brief What Happens to the Zygote After It Gets Implanted. - Science


Describe in brief what happens to the zygote after it gets implanted.



The zygote formed after fertilisation in the fallopian tube is implanted in the uterus. It divides repeatedly to form a mass of cells known as embryo. This embryo gets attached to the inner layer of the uterine cavity, i.e., endometrium.  It thickens every month and is supplied with blood to nourish the embryo. Soon it gets covered by rapidly dividing uterine cells. This leads to pregnancy.

Within a span of some months, the embryo starts developing limbs and begins to resemble a miniature human being. When all body parts of the embryo can be recognised, it becomes a foetus. When this foetus is fully developed, the mother gives birth to the baby.

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2013-2014 (March) Delhi Set 1

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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 two functions ovary of human female reproductive system.

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

When a cell reproduces, what happens to its DNA?

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

Give scientific reasons: When an ovum gets fertilized, menstrual cycle stops temporarily in a woman.

The diagram given below is that of a developing human foetus. Study the diagram and then answer the questions that follow: 

(i) Label the parts numbered 1 to 3 in the diagram.
(ii) Mention any two functions of the part labelled 2 in the diagram.
(iii) Explain the significance of the part numbered 3 in the diagram.
(iv) Define the term ‘Gestation’. What is the normal gestational period of the developing human embryo?
(v) Mention the sex chromosomes in a male and female embryo.

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

What is the scientific name of womb?

Why is it an advantage for the testes to be situated in the scrotal sac outside the main body cavity? Can you think of one disadvantage?

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.

X and Y are two human beings. The organ A in the reproductive system of X releases a mature gamete B once a month which goes into a tube-like structure C through a funnel-like opening. The organ D in the reproductive system of Y makes and releases gametes E which pass through a duct F and are introduced by an organ of Y, into the body of X. B and E fuse together in C to form a new cell G. The cell G divides repeatedly to form a ball of cells H which gets embedded in the lining of organ I of reproductive system of X where it grows and develops into a baby.
(a) Name (i) organ A, and (ii) gamete B.
(b) Write two names of tube-like structure C.
(c) Name (i) organ D, and (ii) gamete E.
(d) Write two names of duct F.
(e) Name (i) cell G (ii) ball of cells H, and (iii) organ I.
(f) Out of X and Y, which one is (i) male, and (ii) female?

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

List two changes observed in girls at the time of puberty.

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.

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

Give appropriate term of the following:
The onset of reproductive phase in a young female.

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.

Define the following:

Define the following:    

Define the following:    

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?


Sexual Reproduction and Asexual Reproduction.

Explain the term Parturition or birth.

Choose the Odd One Out:

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.


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