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

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 male homologue of the female clitoris is

    (a)

    Scrotum

    (b)

    Peni

    (c)

    Urethra

    (d)

    Testis

  2. 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

  3. Oral contraceptive pills contain synthetic ____ and hormones

    (a)

    androgen and testosterone

    (b)

    Androgen and Oxytocin

    (c)

    relaxin and inhibin

    (d)

    Progesterone and estrogen

  4. Assertion (A): IUD's are inserted in the ovary.
    Reason (R): IUD's Increases phagocytosis of the sperm.

    (a)

    Both A and R are correct

    (b)

    Both A and R are incorrect

    (c)

    A is correct R is incorrect

    (d)

    A is incorrect R is correct

  5. Mangolism is a genetic disorder which is caused by the presence of an extra chromosome number

    (a)

    20

    (b)

    21

    (c)

    4

    (d)

    23

  6. __________ is a disease where abnormal haemoglobin is produced in patients.

    (a)

    Phenylketonuria

    (b)

    Huntington's chorea

    (c)

    Thalassemia

    (d)

    Albinism

  7. A pleiotropic gene:

    (a)

    Is a gene evolved during Pliocene

    (b)

    Controls a trait only in combination with another gene

    (c)

    Controls multiple traits in an individual

    (d)

    Is expressed only in primitive plants

  8. An operon is a:

    (a)

    Protein that suppresses gene expression

    (b)

    Protein that accelerates gene expression

    (c)

    Cluster of structural genes with related function

    (d)

    Gene that switched other genes on or off

  9. The term nucleic acid was coined by ________.

    (a)

    Miescher

    (b)

    Hofmeister

    (c)

    Altman

    (d)

    Mcleod

  10. Which of the following is not required for any of the techniques of DNA finger printing available at present?

    (a)

    Zinc finger analysis

    (b)

    Restriction enzymes

    (c)

    DNA-DNA hybridization

    (d)

    polymerase chain reaction

  11. 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

  12. According to Neo Darwinism change in the frequency of genes in population arise due to all. Except.

    (a)

    Natural selection

    (b)

    Mutation

    (c)

    Struggle for existence

    (d)

    Variation

  13. Genetic drift leads to

    (a)

    Mutation

    (b)

    Bottle neck effect

    (c)

    Immigration

    (d)

    Isolation

  14. Cirrhosis of liver is caused by chronic intake of ______

    (a)

    Opium

    (b)

    Alcohol

    (c)

    Tobacco

    (d)

    Cocaine

  15. The substance not present in tobacco is

    (a)

    nicotine

    (b)

    tar

    (c)

    Morphine

    (d)

    carbon monoxide

  16. Bacillary dysentery is caused due to __________________

    (a)

    Salmonella

    (b)

    Shigella

    (c)

    Clostridium

    (d)

    Yersinia

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

    (a)

    Archaebacteria

    (b)

    Eubacteria

    (c)

    Blue-green algae

    (d)

    Saprophytic fungi

  18. Name the scientists who discovered Interferons?

    (a)

    Alick Issac and Jean Lindemann

    (b)

    Thalassemia

    (c)

    Haemophilia

    (d)

    Anaemia

  19. The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do A, B and C represent respectively.

    (a)
    A B C
    Conformer Regulator Partial Regulator
    (b)
       A     B     C
    Regulatorr Partial Regulator Conformer
    (c)
    A B C
    Partial Regulatorr Regulator Conformer
    (d)
    A B C
    Regulatorr Conformerr Partial Regulatorr
  20. Which among the following awards instituted by the Government of India for individuals or communities from rural areas that have shown extraordinary courage and dedication in protecting Wildlife?

    (a)

    Indira Gandhi Paryavaran Puraskar

    (b)

    Medini Puruskar Yojana

    (c)

    Amrita Devi Bishnoi Award

    (d)

    Pitambar Pant National Award

  21. Identify the incorrect pair

    (a)

    sporopollenin - exine of pollen grain

    (b)

    tapetum – nutritive tissue for developing microspores

    (c)

    Nucellus – nutritive tissue for developing embryo

    (d)

    obturator – directs the pollen tube into micropyle

  22. Which of the following explains how progeny can posses the combinations of traits that none of the parent possessed?

    (a)

    Law of segregation

    (b)

    Chromosome theory

    (c)

    Law of independent assortment

    (d)

    Polygenic inheritance

  23. pBR 322, BR stands for

    (a)

    Plasmid Bacterial Recombination

    (b)

    Plasmid Bacterial Replication

    (c)

    Plasmid Boliver and Rodriguez

    (d)

    Plasmid Baltimore and Rodriguez

  24. Interaction Effects on species X Effects on species Y
    Mutualism A (+)
    B (+) (-)
    Competition (-) C
    D (-) o
    (a)
    A B C D
    (+) Parasitism (-) Amensalism
    (b)
    A B C D
    (-) Mutualism (+) Competition
    (c)
    A B C D
    (+) Competition (0) Mutualism
    (d)
    A B C D
    (O) Amensalism (+) Parasitism
  25. Which of the following is not a sedimentary cycle

    (a)

    Nitrogen cycle

    (b)

    Phosphorous cycle

    (c)

    Sulphur cycle

    (d)

    Calcium cycle

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