Tag: human fertilization

Questions Related to human fertilization

The first step in the process of fertilization is development of zygote 

biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

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Correct Option: B

Fertilization result in the formation of embryo 

biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

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Correct Option: B

Fertilization takes places in uterus

biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

  1. True

  2. False

  3. Ambigous

  4. Data insufficient

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Correct Option: B

In humans, successful fertilization takes place in

biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

  1. Ovary

  2. Fallopian tube

  3. Uterus

  4. Cervix

  5. Vagina

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Correct Option: B
Explanation:
  • During copulation (coitus) semen is released by the penis into the vagina (insemination). 
  • The motile sperms swim rapidly, pass through the cervix, enter into the uterus and finally reach the ampullary region of the fallopian tube.
  • The ovum released by the ovary is also transported to the ampullary region of fallopian tube where fertilisation takes place. 
  • So, the correct option is 'Fallopian tube'.

On fertilization of egg nucleus with sperm nucleus 

biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

  1. First maturation is completed

  2. Second maturation is completed

  3. Embryo is formed

  4. First polar body is formed

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Correct Option: C
Explanation:

When the egg nucleus and the sperm nucleus unites in the fallopian tube, it results in fertilization. And it results in the production of zygote or fertilized egg. Maturation is completed during the the gametogenesis (before the formation of egg / sperm) and the polar body is also formed during this process.
Thus, the correct answer is option C.

On fertilization of egg nucleus with sperm nucleus

biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

  1. Second maturation is completed

  2. Zygote is formed

  3. First polar body is formed

  4. First maturation is completed

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Correct Option: B
Explanation:

Fertilization occurs when the nucleus of both, a sperm and an egg fuse to form a diploid cell, known as a zygote. A zygote is a diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum. An organism in the early stages of growth and differentiation, from fertilization to the beginning of the third month of pregnancy (in humans) is called as an embryo, after that, an embryo is called a fetus.

Fertilization of ovum occurs in

biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

  1. Fimbriae of oviduct

  2. Isthmus of oviduct

  3. Ampulla of oviduct

  4. None of the above

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Correct Option: C
Explanation:

During copulation, semen is released by the penis into the vagina. The motile sperms swim rapidly, pass through the cervix, enter into the uterus and finally reach the junction of the isthmus and ampulla of the fallopian tube. the ovum released by the ovaries also transported to the ampullary-isthmus junction where fertilization takes place.

So, the correct option is 'Ampulla of oviduct'.

Is the chromosome number of the zygote, embryonal cells, and adult of a particular organism always constant? How is the constancy maintained in these three stages?

biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

  1. Yes, by mitosis

  2. Yes, by meiosis

  3. No, by meiosis

  4. No, by mitosis

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Correct Option: A
Explanation:

  • A zygote is the fertilized egg that results from the union of male and female gametes. Once, the zygote is formed, 
  • it undergoes mitotic divisions. Embryonal cells also divide by mitosis to produce more of its kind. The cells in the adult organism also divide by mitosis.
Mitosis is a type of cell division in which the chromosomes in a cell nucleus are separated into two equal sets of chromosomes, each in its own nucleus.

Thus, the correct answer is option A.

What would be the ratio of chromosome number between an egg and its zygote? 

biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

  1. 1 : 2

  2. 2 : 2

  3. 1 : 3

  4. 2 : 1

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Correct Option: A
Explanation:

The egg is the female gamete and is haploid in nature containing 'n' number of chromosomes. Zygote is formed by the fusion of male and female gametes and is thus diploid in nature and contains '2n' number of chromosomes.
Thus, the correct answer is option A.

Which of the following lead to pregnancy and development of embryo.
(i) Fertilization of egg
(ii) Maturation of egg
(iii) Release of egg
(iv) Embedding of embryo in thickened uterine wall.
Which of the following options gives the correct order of sequence in which they occur?

biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

  1. (i), (ii), (iii), (iv)

  2. (ii), (i), (iii), (iv)

  3. (i), (iv), (ii), (iii)

  4. None of the above

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Correct Option: D
Explanation:

After ovulation only matured eggs can be fertilized in reproduction. After fertilization at blastocyst stage implantation occurs in uterine wall and development of embryo takes place. Thus, the correct answer is option D.