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Biology Test 178
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Biology Test 178
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  • Question 1/10
    4 / -1

    Formation of gametophyte directly from sporophyte without meiosis is known as :-

  • Question 2/10
    4 / -1

    Nucellar polyembryony is common in

  • Question 3/10
    4 / -1

    What would be number of chromosome in aleurone layer if megaspore mother cell contain 18 chromosomes :

    Solutions

    No. of chromosome in megaspore mother cell =18
    2n = 18
    megaspore mother cell is diploid
    No. of chromosomes in alurone layer
    Alurone layer is a part of endosperm and endosperm is triploid (3n)
    2n = 18 so n = 9
    3n = 27
    (No. of chromosomes in alurone layer – 3n = 27)

     

  • Question 4/10
    4 / -1

    A typical angiospermic embryo sac contains

  • Question 5/10
    4 / -1

    Consider the following statements-

    (i) In angiosperms, a typical embryosac at maturity is 7 nucleated, 8 celled.

    (ii) Fertilisation in angiosperms is called double fertilisation because two male gametes involve in fertilisation.

    (iii) Formation of endosperm always precedes development of the embryo.

    Which of the above statements is/are correct?

  • Question 6/10
    4 / -1

    Which of the following helps in elevation of testes ?

  • Question 7/10
    4 / -1

    Which of the following is not a part of female external genitalia ?

  • Question 8/10
    4 / -1

    What do you mean by the term 'spermiogenesis? 

  • Question 9/10
    4 / -1

    Find out which option is correct regarding diagrammetic presentation of spermatogenesis given below ?

  • Question 10/10
    4 / -1

    Which of the following option represents haploid and diploid stages of gametogenesis respectively?

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