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The tropoblast layer gets attached to th...

The tropoblast layer gets attached to the endomentrium and the inner call mass get differentiated into embryo. identify the scientific term for the attachment of blastocyst to the endomerial lining of the uiterus.

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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.

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.

Knowledge Check

  • Assertion: During implantation, the trophoblast layer gets attached to the endometrium. Reason: The inner cell mass of the blastocyst gets differentiated as embryo.

    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.

  • A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is

    A
    Commensalism
    B
    Amensalism
    C
    Ectoparasitism
    D
    Symbiosis

  • Read the following statements carefully and select the appropriate option given below . (i) The arrangement of veinlets and vein in leaf is termed as venation . (ii) In palmately compound leaves ,the leaflets are attached at a common axis (rachis). (iii) If gynoecium is situated in the centre and other parts of the flower are located on the rim of the thalamus almost at the same level , it is called epigynous flowers . (iv) If one margin of the appendage overlaps the next one and so on , the aestivation is called twisted . (v) The outer covering of endosperm separates the embryo by a proteinaceous layer called aleurone layer in monocotyledonous seed .

    A
    All are correct except one statement.
    B
    All are correct except two staments.
    C
    All are correct except three statements.
    D
    All are correct except four statements.

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    Read the following statements and find out the incorrect statements. a. Asexual reproduction is common among single celled organisms, and in plants and animals with relatively complex organisations. b. In yeast, the division is unequal and small buds are produced that remain attached initially to the parent cell which eventually gets separated and mature into new yeast organism (cells). c. Vegetative reproduction is also a type of asexual reproduction. d. While in animals and other simple organisms the term vegetative reproduction is used unambiguously, in plants, the term asexual reproduction is frequently used. e. Water hyacinth is also called 'Terror of Bengal.'

    Read the following statements carefully and select the appropriate option given below (i) At telophase, the individual chromosomes can no longer be seen and chromatin material tends to collect in a mass at the two poles. (ii) Mitosis usually results in the production of four diploid daughter cells with identical genetic complement. (iii) The production of offspring by sexual reproduction includes the fusion of two gametes. (iv) Meiosis involves pairing of homologous chromosomes and recombination between them. (v) At metaphase II stage, the chromosomes align at teh equator and the microtubules from opposite poles of the spindle get attached to the kinetochores

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