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

12th Standard

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Biology

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

    Answer all the questions

    25 x 1 = 25
  1. In which type of parthenogenesis are only males produced?

    (a)

    Arrhenotoky

    (b)

    Thelytoky

    (c)

    Amphitoky

    (d)

    Both a and b

  2. Transverse Binary fission is seen is ______

    (a)

    Vorticella

    (b)

    Paramecium

    (c)

    Plasmodium

    (d)

    Euglena

  3. Paedogamy is the sexual union of _____

    (a)

    morphologically different gametes

    (b)

    physiologically different gametes

    (c)

    young individuals immediately after the formation from parents

    (d)

    dissimilar gametes

  4. A few statements describing certain features of reproduction are given below. Select the options that are true for both sexual and asexual reproduction from the options given:
    (i) Gametic fusion takes place
    (ii) Transfer of genetic material takes place
    (iii) Reduction division takes place
    (iv) Progeny have some resemblance, with parents

    (a)

    i and ii

    (b)

    ii and iii

    (c)

    ii and iv

    (d)

    i and ii

  5. The ______ is the smallest human cell.

    (a)

    sperm

    (b)

    neuron

    (c)

    nephron

    (d)

    alveoli

  6. The follicular cells of the ovum are held together by a substance called _____

    (a)

    hyaluronidase

    (b)

    progesterone

    (c)

    oestrogen

    (d)

    hyaluronic acid

  7. Which of the following is correct regarding HIV, hepatitis B, gonorrhoea and trichomoniasis?

    (a)

    Gonorrhoea is a STD whereas others are not.

    (b)

    Trichomoniasis is a viral disease whereas others are bacterial.

    (c)

    HIV is a pathogen whereas others are diseases.

    (d)

    Hepatitis B is eradicated completely whereas others are not.

  8. In the year ______    india is expected to become the largest country in population size ______

    (a)

    2021

    (b)

    2025

    (c)

    2022

    (d)

    2030

  9. Oral contraceptive pills contain synthetic ____ and hormones

    (a)

    androgen and testosterone

    (b)

    Androgen and Oxytocin

    (c)

    relaxin and inhibin

    (d)

    Progesterone and estrogen

  10. Haemophilia is more common in males because it is a

    (a)

    Recessive character carried by Y-chromosome

    (b)

    Dominant character carried by Y-chromosome

    (c)

    Dominant trait carried by X-chromosome

    (d)

    Recessive trait carried by X-chromosome

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

    (a)

    Phenylketonuria

    (b)

    Huntington's chorea

    (c)

    Thalassemia

    (d)

    Albinism

  12. 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

  13. Hershey and Chase experiment with bacteriophage showed that

    (a)

    Protein gets into the bacterial cells

    (b)

    DNA is the genetic material

    (c)

    DNA contains radioactive sulphur

    (d)

    Viruses undergo transformation

  14. The Okazaki segments are joined by _________.

    (a)

    DNA polymerase

    (b)

    RNA polymerase

    (c)

    DNA ligase

    (d)

    Endonuclease

  15. Precursor mRNA \(\underrightarrow { A } \) hnRNA

    (a)

    Capping

    (b)

    Tailing

    (c)

    Splicing

    (d)

    Transcribing

  16. The first life on earth originated

    (a)

    in air

    (b)

    on land

    (c)

    in water

    (d)

    on mountain

  17. Presence of tail in human baby is an example for ________________

    (a)

    Vestigial organ

    (b)

    Atavism

    (c)

    Homologous organ

    (d)

    Analogous organ

  18. A 30 year old woman has bleedy diarrhoea for the past 14 hours, which one of the following organisms is likely to cause this illness?

    (a)

    Streptococcus pyogens

    (b)

    Clostridium difficile

    (c)

    Shigella dysenteria

    (d)

    Salmonella enteritidis

  19. Which of the following microorganism is used for production of citric acid in industries?

    (a)

    Lactobacillus bulgaris

    (b)

    Penicillium citrinum

    (c)

    Aspergillus niger

    (d)

    Rhizopus nigricans

  20. The first clinical gene therapy was done for the treatment of

    (a)

    AIDS

    (b)

    Cancer

    (c)

    Cystic fibrosis

    (d)

    SCID

  21. All populations in a given physical area are defined as

    (a)

    Biome

    (b)

    Ecosystem

    (c)

    Territory

    (d)

    Biotic factors

  22. Choose the correct statement from the following

    (a)

    Gametes are involved in asexual reproduction

    (b)

    Bacteria reproduce asexually by budding

    (c)

    Conidia formation is a method of sexual reproduction

    (d)

    Yeast reproduce by budding

  23. Extra nuclear inheritance is a consequence of presence of genes in

    (a)

    Mitrochondria and chloroplasts

    (b)

    Endoplasmic reticulum and mitrochondria

    (c)

    Ribosomes and chloroplast

    (d)

    Lysososmes and ribosomes

  24. pBR 322, BR stands for

    (a)

    Plasmid Bacterial Recombination

    (b)

    Plasmid Bacterial Replication

    (c)

    Plasmid Boliver and Rodriguez

    (d)

    Plasmid Baltimore and Rodriguez

  25. 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

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