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12th Standard English Medium Biology Reduced Syllabus Public Exam Model Question Paper - 2021

12th Standard

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Biology

Time : 02:45:00 Hrs
Total Marks : 70

    Part I

    Answer all the questions.

    Choose the most suitable answer from the given four alternatives and write the option code with the corresponding answer.

    15 x 1 = 15
  1. Which among the following animals exhibit ovoviviparity?

    (a)

    frog

    (b)

    shark

    (c)

    sheep

    (d)

    hen

  2. The approach which does not give the defined action of contraceptive is

    (a)

    Hormonal contraceptive-Prevents entry of sperms, prevent ovulation and fertilization

    (b)

    Vasectomy-Prevents spermatogenesis

    (c)

    Barrier method-Prevents fertilization

    (d)

    Intra uterine device-Increases phagocytosis of sperms, suppresses sperm motility and fertilizing capacity of sperms

  3. Which of the following mRNA yields 6 amino acids after translation?

    (a)

    UCU UAU AGU CGA UGC AGU UGA AAA UUU

    (b)

    UGA AGA UAG GAG CAU CCC UAC UAU GAU

    (c)

    GUC UGC UGG GCU GAU UAA AGG AGC AUU

    (d)

    AUG UAC CAU UGC UGA UGC AGG AGC CCG

  4. A population will not exist in Hardy- Weinberg equilibrium if

    (a)

    Individuals mate selectively

    (b)

    There are no mutations

    (c)

    There is no migration

    (d)

    The population is large

  5. Yamuna Action Plan was a bilateral project signed between ________________

    (a)

    India and Pakistan Government

    (b)

    India and Japan Government

    (c)

    India and China Government

    (d)

    India and Srilanka Government

  6. Predation and parasitism are which type of interactions?

    (a)

    (+,+)

    (b)

    (+, O)

    (c)

    (--, --)

    (d)

    (+, --)

  7. Diapause is a type of response classifiedunder ______________

    (a)

    Suspend

    (b)

    Migrate

    (c)

    Conform

    (d)

    Regulate

  8. Identify the correct adaptation that checks autogamy

    (a)

    Homogamy

    (b)

    Cleistogamy

    (c)

    Herkogamy

    (d)

    None of the above

  9. 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

  10. Statement 1: The widely accepted DNA replication model is Holliday's hybrid DNA model.
    Statement 2: The vertical cut in the DNA results in heteroduplex with non-recombinants.

    (a)

    Statement 1 is correct and Statement 2 is incorrect

    (b)

    Statement 1 is incorrect and Statement 2 is correct

    (c)

    Both the statements are correct

    (d)

    Both the statements are incorrect

  11. Micro propagation involves

    (a)

    vegetative multiplication of plants by using micro-organisms.

    (b)

    vegetative multiplication of plants by using small explants.

    (c)

    vegetative multiplication of plants by using microspores.

    (d)

    Non-vegetative multiplication of plants by using microspores and megaspores.

  12. Assertion (A) : Plains and valleys are rich in vegetation
    Reason (R): Slow drain of surface water and better water retention is noticed.

    (a)

    A is true R is false

    (b)

    R explains A

    (c)

    A and R are false

    (d)

    A and R are true. But R doesnot explains A

  13. If 1200 Joules of solar energy is trapped by producers, how much of Joules of energy does the organism in the third trophic level will receive?

    (a)

    120 Joules

    (b)

    12 Joules

    (c)

    1.2 Joules

    (d)

    0.12 Joules

  14. Total number of forestry extension centres in Tamil Nadu is ______________

    (a)

    16

    (b)

    32

    (c)

    18

    (d)

    51

  15. The only cereal that has originated and domesticated from the New world.

    (a)

    Oryza sativa

    (b)

    Triticum asetumn

    (c)

    Triticum duram

    (d)

    Zea mays

  16. Part II

    Answer any 6 of the questions. Question no.24 is compulsory.

    6 x 2 = 12
  17. Define Vivipary.

  18. Placenta is an endocrine tissue. Justify

  19. Name any four Mendelian disorders

  20. Which type of bond is formed
    (a) between a purine and pyrimidine base?
    (b) between the pentose sugar and adjacent nucleotide?

  21. Point out any four peripheral lymphoid organs.

  22. Describe the mutual relationship between the fig and wasp and comment on the phenomenon that operates in this relationship.

  23. Productivity of profundal zone will be low. Why?

  24. Write the common name for (i) Vigna radiata (ll) Cajanus cajan

  25. Name and explain the type of barriers which involve macrophages.

  26. Part III

    Answer any 6 of the questions. Question no.33 is compulsory.

    6 x 3 = 18
  27. Differentiate between the eating habit and brain size of Australopithecus and Ramapithecus.

  28. Write the key features of organic farming.

  29. Classify the adaptive traits found in organisms

  30. Give examples of any three Wild Life Sanctuaries in Tamilnadu.

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

  32. Explain the sex determination mechanism in Carica papaya.

  33. Observe the tabular column and complete it using proper terms.

      Species 1 Species 2 Type of interaction
    i + A Mutalism
    ii  + O B
    iii  C O Amenslism
    iv + - D
    v - E Competition
  34. How do forests help in maintaining the climate?

  35. Who am I?
    (I) Father of Green Revolution.
    (il) Father of Indian Green Revolution

  36. Part IV

    Answer all the questions.

    5 x 5 = 25
    1. Explain the role of oxytocin and relaxin in parturition and lactation.

    2. The procedure of GIFT involves the transfer of female gametes into the fallopain tube, can gametes be transferred to the uterus to achieve the same result? Explain.

    1. Describe the structure of tRNA with a diagram.

    2. Give a detailed account on parthenocarpy. Add a note on its significance.

    1. Explain Dihybrid cross in pea plant.

    2. What do you know about Germplasm conservation. Describe it.

    1. What does competition refers to? Classify and describe it.

    2. Draw a pyramid from following details and explain in brief.
      Quantities of organisms are given-Hawks-50, plants-1000.rabbit and mouse-250 +250, pythons and lizard- 100 + 50 respectively.

    1. Suggest a solution to water crisis and explain its advantages.

    2. Explain the stepwise preparation of Bio-pest repellent from the leaves of Azadirachta indica

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