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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.
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संबंधित प्रश्न
List two functions ovary of human female reproductive system.
State its functions in case of a pregnant human female.
Describe in brief what happens to the zygote after it gets implanted.
Write the function of the following part in a human female reproductive system:
Fallopian tube
Why are testes located outside the abdominal cavity? What is responsible for bringing about changes in appearance seen in boys at the time of puberty?
Give appropriate biological/technical terms for the following:
The kind of twins formed from two fertilized eggs.
State the main function of the Leydig cells
The structure formed by the villi of the embryo and the uterus of the mother.
Where is the male gamete formed in humans?
Fill in the following blank with suitable word :
The menstrual cycle is controlled by.............
What is puberty? Who attains puberty at an earlier age in human beings : male or female (boy or girl)?
What is the scientific name of womb?
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?
Which structure in human female is equivalent to the testes in the male?and in what respect the structures are equivalent?
Draw a labelled diagram of the human female reproductive system. With the help of this diagram, explain the working of human female reproductive system.
What is placenta? What is its function?
In a flower, the parts that produce male and female gametes are respectively :
(a) sepal and anther
(b) filament and stigma
(c) anther and ovary
(d) stamen and style
Which among the following are not the functions of testes at puberty?
(i) formation of germ cells
(ii) secretion of testosterone
(iii) development of the placenta
(iv) secretion of estrogen
During adolescence, several changes occur in the human body. Mark one change from the following associated with sexual maturation in boys.
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?
When a female child is born, her ovaries already contain thousands of immature eggs (or ova) contained in immature structures A. On maturing, A bursts open and an egg shoots out of the ovary in a process called B. The process B starts in the females at puberty and occurs again and again after a time period x. Before every occurrence of process B, the inner lining of uterus becomes thick and soft with lots of blood vessels in it. When the egg cell gets fertilised by a sperm, then an event C occurs in the life of mature human female which lasts for time period y leading to the birth of baby. If, however, the egg cell released by the ovary does not get a sperm to fuse with, then the thick and soft inner lining of uterus breaks down and comes out of the female's body in an event called D. The occurrence of event D is controlled by chemical substances E.
(a) What are A?
(b) What is process B?
(c) What is the time period x?
(d) Name the event C.
(e) How much is the time period y?
(f) What is the name of process D?
(g) Name the chemical substances E.
Given below is a diagram of two systems together in the human body.
 |
- Name the systems.
- Name the parts numbered 1-10.
- Describe the functions of the parts 3, 4, 5 & 6.
- What will happen if the part 3 on both sides gets blocked?
In humans, the fertilization takes place in:
Write two examples of sexually transmitted diseases caused by virus.
Describe in brief the role of vas deferens in human male reproductive system.
List and explain in brief three methods of contraception.
Fill in the blank.
Pollen grains are formed by ______ division in locules of anthers.
Gender of child is determined by the male partner of couple. Explain with reasons whether this statement is true or false.
What is reproduction? List its two types.
Define the following:
Gestation
Define the following:
Implantation
Name the organs of the human male reproductive system and state the functions of any two organs.
Give Technical Term:
What are the age restrictions for marriages by law for boys and girls in India?
State the Location:
Prostate gland
Choose the Odd One Out:
Freshly released human egg has ______.
