Biology in human welfare Important Questions

12th Standard

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Biology

Answer all the questions 

Time : 01:40:00 Hrs
Total Marks : 50

    Part A

    15 x 1 = 15
  1. Which pathogen causes Tikka disease of groundnut?

    (a)

    Cercospora personata

    (b)

    Pyricularia oryzae

    (c)

    Xanthomonas citri

    (d)

    Tungro virus

  2. Binomial of ‘vilvam’ is

    (a)

    Acalypha indica

    (b)

    Aegle marmelos

    (c)

    Cissus quadrangularis

    (d)

    Mimosa pudica

  3. The disease citrus canker is caused by

    (a)

    Virus

    (b)

    fungi

    (c)

    algae

    (d)

    bacteria

  4. Cissus quadrangularis is commonly called as

    (a)

    Vilvam

    (b)

    Poonamayakki

    (c)

    Pirandai

    (d)

    Manathakkali

  5. Catharanthus roseus possess

    (a)

    anticancerous property

    (b)

    antiviral property

    (c)

    insecticidal property

    (d)

    antibiotic property

  6. A protein called brazzein is used as

    (a)

    Low calorie sweetener

    (b)

    Anticancerous substance

    (c)

    single cell protein

    (d)

    Painkiller

  7. Cercospora personata, a fungus causes

    (a)

    Blast disease of rice

    (b)

    Tikka disease of groundnut

    (c)

    citrus canker

    (d)

    Tungro disease of rice

  8. A plant which produces a protein called brazzein, which is many 100 times as sweet as sugar 

    (a)

    Pentadiplandra

    (b)

    Catharanthus roseus

    (c)

    Cola nitida

    (d)

    Ilex paraguriensis

  9. The drug to relax mental and physical stress

    (a)

    ginseng

    (b)

    digixin

    (c)

    quinine

    (d)

    morphine

  10. The cyanobacteria used for artificial inoculation of rice is

    (a)

    E-coli

    (b)

    Bacillus

    (c)

    Nostoc

    (d)

    Pseudomonas

  11. Antibiotic streptocycline is used to control

    (a)

    Tikka disease of groundnut

    (b)

    Tungro disease of rice

    (c)

    Citrus canker of lemon

    (d)

    Blast disease of rice

  12. Low calorie Sweetener Substance used by the people of west Africa is

    (a)

    Brazzein

    (b)

    Glycine

    (c)

    Serine

    (d)

    Saponin

  13. Streptomycin is obtained from

    (a)

    Penicillium notatum

    (b)

    Streptomyces griseus

    (c)

    Streptomyces aureofaciens

    (d)

    Streptomyces venezuelae

  14. Escherichia coli and Vibrio cholerae that colonize the small intestine, produce

    (a)

    delta endotoxin

    (b)

    enterotoxin

    (c)

    basta

    (d)

    exterotoxin

  15. The drug used to treat heart diseases

    (a)

    Morphine

    (b)

    Ginseng

    (c)

    igoxin

    (d)

    Ephedrine

  16. Part B

    5 x 2 = 10
  17. What is soil Reclamation?

  18. Write the medicinal value of Acalypha indica.

  19. What is Azolla?

  20. What is quinine?

  21. What are the alkaloids found in Tobacco?

  22. Part C

    5 x 3 = 15
  23. What is bioinsecticide?

  24. What is humulin?

  25. What is Heterosis?

  26. What is the use of Nif-gene?

  27. What is antibiotic? Write any two names of antibiotics. State their uses.

  28. Part D

    2 x 5 = 10
  29. Write the aims of plant breeding.

  30. Write a brief account on groundnut.

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