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12th Standard Biology English Medium Reduced Syllabus Important Questions with Answer key - 2021 Part - 1

12th Standard

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Biology

Time : 02:45:00 Hrs
Total Marks : 165

    Multiple Choice Questions

    15 x 1 = 15
  1. Animals giving birth to young ones:

    (a)

    Oviparous

    (b)

    Oviviviparous

    (c)

    Viviparous

    (d)

    Both a and b

  2. The glandular accessory organ which produces the largest proportion of semen is

    (a)

    Seminal vesicle

    (b)

    Bulbourethral gland

    (c)

    Prostate gland

    (d)

    Mucous gland

  3. The process which the sperm undergoes before penetrating the ovum is

    (a)

    Spermiation

    (b)

    Cortical reaction

    (c)

    Spermiogenesis

    (d)

    Capacitation

  4. A – Ovulation is the release of ovum from the Graafian follicle.
    R – It occurs during the follicular phase of the menstrual cycle.

    (a)

    A and R are true, R is the correct explanation of A

    (b)

    A and R are true, R is not the correct explanation of A

    (c)

    A is true, R is false

    (d)

    Both A and R are false

  5. Three children of a family have blood groups A, AB and B. What could be the genotypes of their parents?

    (a)

    IA IB and ii

    (b)

    IA Io and IBIo

    (c)

    IB IB and IA IA

    (d)

    IA IA and ii

  6. What can be the blood group of offspring when both parents have AB blood group?

    (a)

    AB only

    (b)

    A, B and AB

    (c)

    A, B, AB and O

    (d)

    A and B only

  7. The _______deals with the control of several inherited human diseases especially inborn errors of metabolism

    (a)

    Euphenics

    (b)

    Eugenics

    (c)

    Euthenics

    (d)

    All of these

  8. The Neanderthal man had the brain capacity of

    (a)

    650 – 800cc

    (b)

    1200cc

    (c)

    900cc

    (d)

    1400cc

  9. Cry toxins obtained from Bacillus thuringiensis are effective against for______

    (a)

    Mosquitoes

    (b)

    Flies

    (c)

    Nematodes

    (d)

    Bollworms

  10. The interaction in nature, where one gets benefit on the expense of other is...

    (a)

    Predation

    (b)

    Mutualism

    (c)

    Amensalism

    (d)

    Commensalism

  11. Which one of the following is not coming under insitu conservation

    (a)

    Sanctuaries

    (b)

    Natural parks

    (c)

    Zoological park

    (d)

    Biosphere reserve

  12. The organization which published the red list of species is

    (a)

    WWF

    (b)

    IUCN

    (c)

    ZSI

    (d)

    UNEP

  13. Pollen tube was discovered by

    (a)

    J.G.Kolreuter

    (b)

    G.B.Amici

    (c)

    E.Strasburger

    (d)

    E.Hanning

  14. The scar left by funiculus in the seed is

    (a)

    tegmen

    (b)

    radicle

    (c)

    epicotyl

    (d)

    hilum

  15. Which of the following sentences are correct?
    1. The offspring exhibit only parental combinations due to incomplete linkage
    2. The linked genes exhibit some crossing over in complete linkage
    3. The separation of two linked genes are possible in incomplete linkage
    4. Crossing over is absent in complete linkage

    (a)

    1 and 2

    (b)

    2 and 3

    (c)

    3 and 4

    (d)

    1 and 4

  16. 2 Marks

    15 x 2 = 30
  17. What is exogamy?

  18. What is paedogenesis?

  19. Identify the parts marked as A, B, C, D, E and F for the below diagram.

  20. Name the four types of fission seen in animals

  21. What is ovulation?

  22. What is corpus albicans?

  23. What is a syndrome?

  24. Given below are some events of eukaryotic replication. Name the enzymes involved in the process.
    (a) Unwinding of DNA (b) Joining of Okazaki fragments
    c) Addition of nucleotides to new strand (d) Correcting the repair

  25. Considering the lac operon of E.coli, name the products of the following genes. a) i gene (b) lac Z gene (c) lac Y gene (d) lac a gene

  26. What are SNPs? Mention its uses.

  27. Name one fossilised connecting link between reptiles and Aves also one living connecting link between Annelida and Arthropoda

  28. Atavistic organs - comment.

  29. What is diapedesis?

  30. Define haematopoiesis.

  31. What are Peyer's patches?

  32. 3 Marks

    15 x 3 = 45
  33. Give reasons for the following:
    (a) Some organisms like honey bees are called parthenogenetic animals
    (b) A male honey bee has 16 chromosomes where as its female has 32 chromosomes

  34. Write a short note on phases of life cycle.

  35. Mention the importance of the position of the testes in humans.

  36. Explain gastrulation.

  37. Explain Foetal-ejection reflex

  38. Name the most effective long-acting reversible contraceptive methods.

  39. How is sex determined in human beings?

  40. A person is infected by HIV. How will you diagnose for AIDS?

  41. If a person thinks he is infected with HIV, due to unprotected sex, and goes for a blood test. Do you think a test such as ELISA will help? If so why? If not, why?

  42. What are DNA vaccines?

  43. Why does the zygote divides only after the division of Primary endosperm cell.

  44. Is their any possibilities to transfer a suitable desirable gene to host plant without vector? Justify your answer.

  45. Explain the basic concepts involved in plant tissue culture

  46. Generally human activities are against to the ecosystem, where as you a student how will you help to protect ecosystem?

  47. Write the uses of nuts you have studied.

  48. 5 Marks

    15 x 5 = 75
  49. Explain Oparin - Haldane hypothesis on evolution.

  50. Explain the process of sewage treatment.
     

  51. Describe the role of PCR in clinical field.

  52. What is radioactive waste how cap it be managed

  53. How air pollution can be controlled?

  54. Explain any five types of angiospermic ovules.

  55. Enumerate the characters of anemophilous flowers

  56. Draw a Howchart depicting the various types of ploidy.

  57. Write a note on Replica plating technique.

  58. Discuss the protocol for micropropagation of banana.

  59. Point out any five morphological adaptations of epiphytes.

  60. Write in detail about Autogenic succession and Allogenic succession.

  61. What are the objectives of Afforestation programme?

  62. Give a comparative account on Seaweed liquid fertilizer.

  63. Draw a table mentioning binominals, family name, useful part and their medical uses of any five local medicinal plants

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