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12th Standard Botany English Medium Free Online Test One Mark Questions 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. First cell of male gametophyte in angiosperm is

    (a)

    Microspore

    (b)

    megaspore

    (c)

    Nucleus

    (d)

    Primary Endosperm Nucleus

  2. Which of the following plant was introduced as a contaminant into India along with wheat?

    (a)

    Parthenium hysterophorus

    (b)

    Zea mays

    (c)

    Rosa indica

    (d)

    Mangifera indica

  3. Identify the correct statement.

    (a)

    Grafting is a modem method of artificial propagation.

    (b)

    The plant which is used for graft is Scion.

    (c)

    In tongue grafting, the scion bud is placed inside the incision beneath bark.

    (d)

    Grafting is usually carried out in monocot plants.

  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. Assertion (A): Test cross is done between F2 hybrid with F. recessive
    Reason (R): It helps to identify the homozygosity of hybrids

    (a)

    A and R are correct R explains A

    (b)

    A and R are incorrect

    (c)

    A is correct R is incorrect

    (d)

    A is incorrect R is correct

  6. 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.

  7. Transition type of gene mutation is caused when__________

    (a)

    AC is replaced by GT

    (b)

    AG is replaced by TC

    (c)

    AC is replaced by TG

    (d)

    TC is replaced by AG

  8. Statement 1: Pairing of homologous chromosome is called as syndesis.
    Statement 2: Proterminal synapsis occurs from telomeres.

    (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

  9. The process of recombinant DNA technology has the following steps
    I. amplication of the gene
    II. Insertion of recombinant DNA into the host cells
    III. Cutting of DNA at specific location using restriction enzyme .
    IV. Isolation of genetic material (DNA) Pick out the correct sequence of step for recombinant DNA technology.

    (a)

    ii, iii, iv, and i

    (b)

    iv, ii, iii, and i

    (c)

    i, ii, iii, and iv

    (d)

    iv, iii, i, and ii

  10. Cohesive ends are _____________

    (a)

    Blunt ends

    (b)

    Flush ends

    (c)

    Sticky ends

    (d)

    Symmetric cuts

  11. Statement 1: Liposomes are the artificial lipoprotein vesicles.
    Statement 2: Liposomes are highly used in gene transfer.

    (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. Tetracycline is obtained from_________

    (a)

    S.nodosus

    (b)

    S.aureofacins

    (c)

    S.grises

    (d)

    P. chryosogenum

  13. Select the incorrect statement from given statement

    (a)

    A tonic used for cardiac arrest is obtained from Digitalis purpuria

    (b)

    Medicine used to treat Rheumatic pain is extracted from Capsicum annum

    (c)

    An anti malarial drug is isolated from Cinchona officinalis.

    (d)

    Anti-cancinogenic property is not seen in Catharanthus roseus.

  14. Assertion (A) : Protoplasts are cells devoid of cell wall.
    Reason (R) : Secondary metabolites are synthesized by protoplasmic fusion.

    (a)

    Both A and R are correct but R is not a correct explanation to A

    (b)

    R explains A

    (c)

    A is correct R is incorrect

    (d)

    Both A and R are incorrect

  15. Identify the cryoprotectant

    (a)

    Dimethyl formamide

    (b)

    Fructose

    (c)

    Glycerol

    (d)

    Sodium alginate

  16. 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

  17. The bottom most zone of a pond is termed as .

    (a)

    Limnetic zone

    (b)

    Littoral zone

    (c)

    Benthic zone

    (d)

    Profundal zone

  18. Clean Development Mechanism (CDM) is defined in ________________

    (a)

    Copenhagen Acord

    (b)

    Montreal Protocol

    (c)

    Paris Agreement

    (d)

    Kyoto Protocol

  19. Who is popularly called as the "father of green revolution in India"?

    (a)

    Nel Jeyaraman

    (b)

    Dr. M.S. Swaminathan

    (c)

    Dr. Nammalvar

    (d)

    N.G.P. Rao

  20. The plant source of Marijuana is ________

    (a)

    Andrograph is paniculata

    (b)

    Phyllanthus maderspatensis

    (c)

    Cannabis sativa

    (d)

    Papaver somniferum

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