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प्रश्न
“Gender of child is determined by the male partner of couple”. Draw a diagram explaining the above statement.
उत्तर
1). The chromosome number in germ cells producing the gametes are diploid i.e. 2n. It includes 22 pairs of autosomes and 1 pair of sex-chromosomes i.e. (44 + XX or 44 + XY).
2). These germ cells divide by meiosis.
3). Due to this, gametes contain only haploid (n) number of chromosomes i.e. (22 + X or 22 + Y).
4). Two types of sperms are produces as (22 + X) or (22 + Y) whereas oocytes are produced of only one type as (22 + X).
5). Both, sperms and oocytes are produced by meiosis.
6). In case of sperms, process of meiotic division is completed before the sperms leave male reproductive tract.
7). However, in case of oocytes, process of meiotic division completes after ovulation; during fertilization in oviduct.
APPEARS IN
संबंधित प्रश्न
Explain the process of development in human beings.
Draw a sectional view of human female reproductive system and label the part where
(i) eggs develop.
(ii) fertilisation takes place.
(iii) fertilised egg gets implanted.
List two functions ovary of human female reproductive system.
What are the functions of testes in the human male reproductive system?
Describe in brief what happens to the zygote after it gets implanted.
If a woman is using a copper-T, will it help in protecting her from sexually transmitted diseases?
What are the different methods of contraception?
State the changes that take place in the uterus when Female gamete/egg is not fertilised
Differentiate between Sperm duct and fallopian rube (function)
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.
Where is the male gamete formed in humans?
Where is the female gamete formed in humans?
What is the frequency of menstrual cycle in human females (or women)?
Write the names of female sex hormones.
What are the male and female gonads in human beings? Mention their functions.
What is the scientific name of womb?
What joins embryo to placenta in mother's body?
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:
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- 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.
State the role of placenta in the development of embryo.
Describe the role of the following in human beings:
(i) Seminal vesicles
(ii) Prostate gland
Sketch and label human female reproductive system.
Is the woman responsible for sex-determination of child? Justify your answer.
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:
Organ where implantation takes place.
Define the following:
Monoceious
Define the following:
Clone
Answer the following question:
Why are family planning measures needed in our country?
What is sexual reproduction? What are its essential features?
What are the signs of puberty in human males and females?
What do you understand by an inguinal hernia?
Draw a labeled diagram of the human female reproductive system.
State the Location:
Prostate gland
Choose the Odd One Out:
Choose the Odd One Out:
The mature sperms are stored in the ____________.
Correct sequence in development is ______.
