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Byju's Answer
Standard XII
Biology
Introduction to the Female Reproductive System
The diagram b...
Question

The diagram below represents the development of a human zygote from fertilization to the late blastocyst stage.

Select a correct statement from the following options


A

If two sperms penetrate the oocyte membrane at the time of fertilization, conjoined twins with shared body parts will be born.

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B

During the process of in vitro fertilization with embryo transfer (IVF-ET), the embryo is transferred at the 2-cell stage to the mother’s uterus.

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C

The outer cells (structure A) of the early-blastocyst will eventually form the foetus.

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D

In ZIFT, the zygote with 8-cell stage is transferred into the fallopian tube.

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Solution

The correct option is D

In ZIFT, the zygote with 8-cell stage is transferred into the fallopian tube.


If two sperms penetrate the oocyte membrane and fertilization occurs, then fraternal twins are born.
For IVF, followed by embryo transfer, embryo with more than 8 blastomeres is transferred into the uterus to complete its further development.
Inner cells mass of the early blastocyst will form the foetus.


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Q. Which of the following statement(s) is/are correct with respect to ZIFT?
i. It stands for zygote intra fallopian transfer.
ii. In this, zygote is transferred into the uterus after in vitro fertilisation.
iii. Early embryos with more than 8 blastomeres are transferred into the fallopian tube.

Q. Select the correct match of the techniques given in column I with its feature given in column II. Column I Column II
A) ICSI 1) Artificially introduction of semen into the vagina or uterus
B) IUI 2) Transfer of ovum collected from a donor into the fallopian tube where fertilization occurs
C) IUT 3) Formation of embryo by directly injecting sperm into the ovum
D) GIFT 4) Transfer of the zygote or early embryo (with upto 8 blastomeres) into a fallopian tube
E) ZIFT 5) Transfer of embryo with more than 8 blastomeres into the uterus

Q. Select the correct match of the techniques given in column I with its feature given in column II.
Column I Column II
A. ICSI I. Artificial introduction of semen into the vagina or uterus
B. IUI II. Transfer of ovum collected from a donor into the fallopian tube where fertilization occurs
C. IUT III. Formation of embryo by directly injecting sperm into the ovum
D. GIFT IV. Transfer of the zygote or early embryo ( with upto 8 blastomeres) into a fallopian
E. ZIFT V. Transfer of embryo with more than 8 blastomeres into the uterus

Q. Which two of the following statements are incorrect regarding in vitro fertilization?
(i) In this method, ova from the wife/donor female and sperms from the husband/donor male are induced to form zygote in the uterus.
(ii) If the embryo is having 2 blastomeres, it is transferred into the uterus.
(iii) If the embryo is with more than 8 blastomeres, it is transferred into the uterus.
(iv) The baby thus produced is called test tube baby.
Q. _________ deals with the study of prenatal stage of development beginning from formation of gametes, fertilization, formation of zygote, development of embryo and fetus to the birth of a new individual.
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