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12th Standard Biology English Medium Free Online Test 1 Mark Questions 2020 - Part Two

12th Standard

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Biology

Time : 00:25:00 Hrs
Total Marks : 25

    Answer all the questions

    25 x 1 = 25
  1. The mode of reproduction in bacteria is by

    (a)

    Formation of gametes

    (b)

    Endospore formation

    (c)

    Conjugation

    (d)

    Zoospore formation

  2. All the following animals are continuous breeders, except.

    (a)

    Frogs

    (b)

    Honey bees

    (c)

    Poultry

    (d)

    Rabbit

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

    (a)

    Seminal vesicle

    (b)

    Bulbourethral gland

    (c)

    Prostate gland

    (d)

    Mucous gland

  4. Identify the correct statements from the following

    (a)

    Chlamydiasis is a viral disease

    (b)

    Gonorrhoea is caused by a spirochaete bacterium, Treponema palladium

    (c)

    The incubation period for syphilis is is 2 to 14 days in males and 7 to 21 days in females

    (d)

    Both syphilis and gonorrhoea are easily cured with antibiotics

  5. Which of the following phenotypes in the progeny are possible from the parental combination AxB?

    (a)

    A and B only

    (b)

    A,B and AB only

    (c)

    AB only

    (d)

    A,B,AB and O

  6. A mRNA molecule is produced by

    (a)

    Replication

    (b)

    Transcription

    (c)

    Duplication

    (d)

    Translation

  7. Which of the following was the contribution of Hugo de Vries?

    (a)

    Theory of mutation

    (b)

    Theory of natural Selection

    (c)

    Theory of inheritance of acquired characters

    (d)

    Germplasm theory

  8. Due to change in the diet containing less cellulose,___________ inhuman become functionless and is reduced to a Vermiform appendix.

    (a)

    Small intensive

    (b)

    large intensive

    (c)

    Rectum

    (d)

    caecum

  9. The sporozoites of Plasmodium vivax are formed from ________

    (a)

    Gametocytes

    (b)

    Sporoblasts

    (c)

    Oocysts

    (d)

    Spores

  10. The pathogenic bacteria causing bubonic plague is______

    (a)

    yersinia pestis

    (b)

    Clostridium tetani

    (c)

    Shigella sp

    (d)

    Streptococcus pneumoniae

  11. __________is not linked to malaria

    (a)

    Haemozoin

    (b)

    TNF-a

    (c)

    Phencyclidine

    (d)

    Interleuin

  12. Bacillary dysentery is caused due to __________________

    (a)

    Salmonella

    (b)

    Shigella

    (c)

    Clostridium

    (d)

    Yersinia

  13. Which of the following are likely to be present in deep-sea water?

    (a)

    Archaebacteria

    (b)

    Eubacteria

    (c)

    Blue-green algae

    (d)

    Saprophytic fungi

  14. The first living ~rganism to be patented was________

    (a)

    E.coli

    (b)

    Saccharomyces

    (c)

    Pseudomonas putida

    (d)

    Lactobacillus

  15. Which of the following is an r-species

    (a)

    Human

    (b)

    Insects

    (c)

    Rhinoceros

    (d)

    Whale

  16. Identify the correctly matched pair

    (a)

    Tuber - Allium cepa

    (b)

    Sucker - Pistia

    (c)

    Rhizome - Musa

    (d)

    Stolon - Zingiber

  17. How many different kinds of gametes will be produced by a plant having the genotype AABbCC?

    (a)

    Three

    (b)

    Four

    (c)

    Nine

    (d)

    Two

  18. Match list I with list II
     

    List I list II
    A. A pair of chromosomes extra with diploid i) monosomy
    B. One chromosome extra to the diploid ii) tetrasomy
    C. One chromosome loses from diploid iii) trisomy
    D.Two individual chromosomes lose from diploid

    iv) double monosomy

    (a)

    A-i, B-iii, C-ii, D-iv

    (b)

    A-ii, B-iii, C-iv, D-i

    (c)

    A-ii, B-iii, C-i, D-iv

    (d)

    A-iii, B-ii, C-i, D-iv

  19. EcoRI cleaves DNA at

    (a)

    AGGGTT

    (b)

    GTATATC

    (c)

    GAATTC

    (d)

    TATAGC

  20. The time duration for sterilization process by using autoclave is ______ minutes and the temperature is _______

    (a)

    10 to 30 minutes and 125° C

    (b)

    15 to 30 minutes and 121° C

    (c)

    15 to 20 minutes and 125° C

    (d)

    10 to 20 minutes and 121° C

  21. A specific place in an ecosystem, where an organism lives and performs its functions is

    (a)

    habitat

    (b)

    niche

    (c)

    landscape

    (d)

    biome

  22. The following diagram represents

     

    (a)

    pyramid of number in a grassland
    ecosystem

    (b)

    pyramid of number in a grassland ecosystem

    (c)

    pyramid of number in a pond ecosystem

    (d)

    pyramid of biomass in a pond ecosystem

  23. Deforestation means

    (a)

    growing plants and trees in an area where there is no forest

    (b)

    growing plants and trees in an area where the forest is removed

    (c)

    growing plants and trees in a pond

    (d)

    Removal of plants and trees

  24. Groundnut is native of _____________

    (a)

    Philippines

    (b)

    India

    (c)

    North America

    (d)

    Brazil

  25. True about interferon is that

    (a)

    It is synthetic antiviral agent

    (b)

    It inhibits viral replication in cells

    (c)

    It is specific for a particular virus

    (d)

    It causes infection

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