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The blastomeres in the blastocyst are ar...

The blastomeres in the blastocyst are arranged into an outer layer called

A

Aleurone layer

B

Mitoplast

C

Tonoplast

D

Trophoblast

Text Solution

Verified by Experts

The correct Answer is:
D
Newly released mammalian egg is covered by Zona pellucida.
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Knowledge Check

  • Assertion: The embryo with 8 to 16 blastomeres is called a morula. Reason: The blasometeres in the morula are arranged into an outer layer called trophoblast and an inner group of cells attached to trophoblast called the inner cell mass.

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • In human female the blastocyst

    A
    Gets implanted in endometrium by trophoblast cells
    B
    Forms placenta even before implantation
    C
    Gets implanted into uterus 3 days after ovulation
    D
    Gets nutrition from uterine endometrial secretion only after implantation

  • Fill in the blanks: a. Zygote divides to form ...1... which is implanted to uterus. b. The structure which provides vascular connection between foetus and uterus is called ..2... c. Inner cell mass contains certain cells called ...3... which have the potency to give rise to all the tissues and organs. d. By the end of ...4..., most of the major organ systems are formed, for example, the limbs and external genital organs are well -developed. e. Immediately after implantation, the ...5... differentiates into an outer layer called ectodern and an inner layer called endoderm.

    A
    1-morula, 2-umbilical cord, 3-trophoblast, 4-second trimester, 5-stem cells
    B
    1-blastocyst, 2-placenta, 3-stem cells, 4-first trimester, 5-trophoblast
    C
    1-blastocyst, 2-umbilical cord, 3- stem cells, 4-second trimesters, 5-inner cell mass
    D
    1-blastocyst, 2-placenta, 3-stem cells, 4-first trimester, 5-inner cell mass.

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