Term 1 Model Question Paper

12th Standard EM

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Biology

Time : 02:00:00 Hrs
Total Marks : 60
    7 x 1 = 7
  1. Animals giving birth to young ones:

    (a)

    Oviparous

    (b)

    Oviviviparous

    (c)

    Viviparous

    (d)

    Both a and b

  2. The most important hormone in intiating and maintaining lactation after birth is

    (a)

    Oestrogen

    (b)

    FSH

    (c)

    Prolactin

    (d)

    Oxytocin

  3. Select the incorrect action of hormonal contraceptive pills from the following

    (a)

    Inhibition of spermatogenesis.

    (b)

    Inhibition of ovulation

    (c)

    Changes in cervical mucus impairing its ability to allow passage and transport of sperms

    (d)

    Alteration in uterine endometrium to make it unsuitable for implantation

  4. Mangolism is a genetic disorder which is caused by the presence of an extra chromosome number

    (a)

    20

    (b)

    21

    (c)

    4

    (d)

    23

  5. The total number of nitrogenous bases in human genome is estimated to be about

    (a)

    3.5 million

    (b)

    35000

    (c)

    35 million

    (d)

    3.1 billion

  6. Who published the book “Origin of species by Natural Selection” in 1859?

    (a)

    Charles Darwin

    (b)

    Lamarck

    (c)

    Weismann

    (d)

    Hugo de Vries

  7. Pollen tube was discovered by

    (a)

    J.G.Kolreuter

    (b)

    G.B.Amici

    (c)

    E.Strasburger

    (d)

    E.Hanning

  8. 4 x 1 = 4
  9. The ploidy of males produced by arrhenotoky parthenogenesis is _______________

    ()

    haploid

  10. __________ is Known as anti-sterility vitamin.

    ()

    Vitamin-E

  11. Ribosomes are composed of two subunits; the smaller subunit of a ribosome has a binding site for _________ and the larger subunit has two binding sites for two __________

    ()

    mRNA, tRNA

  12. Amensalism is called as__________.

    ()

    Antibiosis

  13. 5 x 1 = 5
  14. Endogenous budding

  15. (1)

    Wiener

  16. Uterus

  17. (2)

    900 cc

  18. IUD

  19. (3)

    secretory phase

  20. R1

  21. (4)

    Phagocytosis

  22. Homo erectus

  23. (5)

    Noctiluca

    8 x 2 = 16
  24. What is parthenogenesis? Give two examples from animals.

  25. Mention the differences between spermiogenesis and spermatogenesis

  26. Which method do you suggest the couple to have a baby, if the male partner fails to inseminate the female or due to very low sperm count in the ejaculate?

  27. What are holandric genes?

  28. List out the major gases seems to be found in the primitive earth.

  29. What are clones?

  30. Name the chemicals used in gene transfer.

  31. Pyramid of energy is always upright. Give reasons

  32. 6 x 3 = 18
  33. Define gametogenesis.

  34. Differentiate Intersexes from Supersexes

  35. Rearrange the descent in human evolution
    Austrolopithecus → Homo erectus → Homo sapiens → Ramapithecus → Homo habilis.

  36. List out the functions of tapetum.

  37. What are multiple alleles?

  38. What is seed ball?

  39. 2 x 5 = 10
  40. Identify the given image and label its parts marked as a, b, c and d

  41. Differentiate continuous variation with discontinuous variation.

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