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12th Standard Botany English Medium Free Online Test One Mark Questions with Answer Key 2020

12th Standard

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Botany

Time : 00:20:00 Hrs
Total Marks : 20

    Answer all the questions

    20 x 1 = 20
  1. Arrange the layers of anther wall from locus to periphery

    (a)

    Epidermis,middle layers, tapetum, endothecium

    (b)

    Tapetum, middle layers, epidermis, endothecium

    (c)

    Endothecium, epidermis, middle layers, tapetum

    (d)

    Tapetum, middle layers endothecium epidermis

  2. A typical anther is ________________

    (a)

    Bisporangiate

    (b)

    Tetrasporangiate

    (c)

    Unisporangiate

    (d)

    Multisporangiate

  3. Observe the diagram and select the correct option mentioning the parts A, B, C and D

    (a)
    A B C D
    Radicle Cotyledon Testa Plumule
    (b)
    A B C D
    Plumule Cotyledon Testa Radicle
    (c)
    A B C D
    Cotyledon Testa Plumule Radicle
    (d)
    A B C D
    Plumule Radicle Testa Cotyledon
  4. The genotype of a plant showing the dominant phenotype can be determined

    (a)

    Back cross

    (b)

    Test cross

    (c)

    Dihybrid corss

    (d)

    Pedigree analysis

  5. Select the period for Mendel’s hybridization experiments

    (a)

    1856 - 1863

    (b)

    1850 - 1870

    (c)

    1857 - 1869

    (d)

    1870 - 1877

  6. What is the phenotypic ratio in case of incomplete dominance?

    (a)

    9: 7

    (b)

    3: 1

    (c)

    1: 2 : 1

    (d)

    1: 1 : 1 : 1

  7. How many map units separate two alleles A and B if the recombination frequency is 0.09?

    (a)

    900 cM

    (b)

    90 cM

    (c)

    9 cM

    (d)

    0.9 cM

  8. Which is not a feature of the chromosomal theory of inheritance?

    (a)

    Somatic cells of organisms are derived from zygote by repeated meiosis.

    (b)

    Chromosomes retain their structural uniqueness throughout the life of an organism.

    (c)

    Mendelian factors are located in chromosomes

    (d)

    Sutton and Boveri independently proposed the theory.

  9. Assertion (A): Polyploidy is common in plants.
    Reason (R): Polyploids possess more than 2 basic sets of chromosomes.

    (a)

    A is true R is false

    (b)

    Both A and R are false

    (c)

    A is true, R is not correct explanation for A

    (d)

    R explains A

  10. Cohesive ends are _____________

    (a)

    Blunt ends

    (b)

    Flush ends

    (c)

    Sticky ends

    (d)

    Symmetric cuts

  11. Statement 1: Bioventing procedure increases 02 flow to accelerate degradation of pollutants.
    Statement 2: Bioaugmentation uses microbes to recover metal pollutants from contaminated sites.

    (a)

    Statement 1 is correct and Statement 2 is also correct.

    (b)

    Statement 1 is correct and Statement 2 is incorrect

    (c)

    Both the statements are incorrect.

    (d)

    Statement 1 is incorrect and Statement 2 is correct.

  12. Identify the plant tissue used for virus free germplasm

    (a)

    Apical meristem

    (b)

    Intercalary meristem

    (c)

    Lateral meristem

    (d)

    Plate meristem

  13. Read the given statements and select the correct option.
    i) Loamy soil is best suited for plant growth as it contains a mixture of silt, sand and clay.
    ii) The process of humification is slow in case of organic remains containing a large amount of lignin and cellulose.
    iii) Capillary water is the only water available to plant roots as it is present inside the micropores.
    iv) Leaves of shade plant have more total chlorophyll per reaction centre, low ratio of chl a and chl b are usually thinner leaves.

    (a)

    i, ii and iii only

    (b)

    ii, iii and iv only

    (c)

    i, ii and iv only

    (d)

    ii and iii only

  14. Pond is a type of

    (a)

    forest ecosystem

    (b)

    grassland ecosystem

    (c)

    marine ecosystem

    (d)

    fresh water ecosystem

  15. Photosynthetically Active Radiation ranges between the wavelength of __________

    (a)

    400 - 600 nm

    (b)

    600 - 700 nm

    (c)

    400 - 500 nm

    (d)

    400 - 700 nm

  16. Which type of ecosystem service does the genetic resources comes under?

    (a)

    Provisioning services

    (b)

    Supporting services

    (c)

    Regulating services

    (d)

    Cultural services

  17. Assertion (A): Prosopis juliflora is native to Afghanistan.
    Reason (R): Alien species refers to non-native species.

    (a)

    A is correct R is incorrect.

    (b)

    A is incorrect R is correct.

    (c)

    R explains A.

    (d)

    Both A and R are incorrect.

  18. Match column I (crop) with column II (Corresponding disease resistant variety) and select the correct option from the given codes.
    Column I Column II
    I) Cowpea i) Himgiri
    II) Wheat ii) Pusa komal
    III) Chilli iii) Pusa Sadabahar
    IV) Brassica iv) Pusa Swarnim

    (a)

    iv iii ii i

    (b)

    ii i iii iv

    (c)

    ii iv i iii

    (d)

    i iii iv ii

  19. Intraspecific hybridization is also termed as __________ 

    (a)

    Intravarietal hybridization

    (b)

    Intervarietal hybridization

    (c)

    Interspecific hybridization

    (d)

    Intergeneric hybridization

  20. The plant source of Marijuana is ________

    (a)

    Andrograph is paniculata

    (b)

    Phyllanthus maderspatensis

    (c)

    Cannabis sativa

    (d)

    Papaver somniferum

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