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12th Standard Biology English Medium Free Online Test Creative One Mark Questions with Answer Key - Part Three

12th Standard

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Biology

Time : 00:10:00 Hrs
Total Marks : 10

    Answer all the questions

    10 x 1 = 10
  1. Conjugation is seen in _____

    (a)

    Vorticella

    (b)

    Amoeba

    (c)

    Reptiles

    (d)

    Actinosphaerium

  2. A few statements with regard to sexual reproduction are given below:
    i. Sexual reproduction does not always require two individuals
    ii. Sexual reproduction generally involves gametic fusion
    iii. Meiosis never occurs during sexual reproduction
    iv. External fertilization is a rule during sexual reproduction
    Choose the correct statements from the options below:

    (a)

    i and iv

    (b)

    i and ii

    (c)

    ii and iii

    (d)

    i and iv

  3. Each testis is covered by a fibrous layer _____

    (a)

    tubulus rectus

    (b)

    corona radiata

    (c)

    vitelline membrane

    (d)

    tunica albuginea

  4. Which one of the following is not the function of placenta?

    (a)

    To facilitate supply of oxygen and nutrients to embryo

    (b)

    To secrete oestrogen

    (c)

    To facilitate the removal of carbondi oxide and material from embryo

    (d)

    To secrete oxytocin during parturition

  5. The incubation period for _____ varies between 1-8 months.

    (a)

    HPV

    (b)

    HIV

    (c)

    HBV

    (d)

    candida

  6. Which of the following is a hormone releasing Intrauterine Device (IUD)?

    (a)

    Multi load 375

    (b)

    LNG - 20

    (c)

    Cervical cap

    (d)

    Vault

  7. The allele Io is called _______

    (a)

    Dominant allele

    (b)

    null allele

    (c)

    null allele

    (d)

    epistatic allele

  8. The enzyme polynucleotide phosphorylase is named after ___________.

    (a)

    Francis crick

    (b)

    Severo Ochoa

    (c)

    Marshall Nirenby

    (d)

    Kornby

  9. The RNA polymerase of prokaryotes binds with ____________ factor to initiate polymerization.

    (a)

    rho

    (b)

    theta

    (c)

    sigma

    (d)

    psi

  10. Species introduced deliberately in an area are referred as_______

    (a)

    Endemic species

    (b)

    Vulnerable species

    (c)

    Exotic species

    (d)

    Extinct species

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