New ! Biology MCQ Practise Tests

12th Standard English Medium Biology Reduced Syllabus One mark Important Questions - 2021(Public Exam )

12th Standard

    Reg.No. :
  •  
  •  
  •  
  •  
  •  
  •  

Biology

Time : 01:00:00 Hrs
Total Marks : 50

    Part A

    50 x 1 = 50
  1. The mode of reproduction in bacteria is by

    (a)

    Formation of gametes

    (b)

    Endospore formation

    (c)

    Conjugation

    (d)

    Zoospore formation

  2. Multiple fission is seen in _______

    (a)

    Vorticella and ceratium

    (b)

    Plasmodium and paramecium

    (c)

    Amoeba and cyanobacteria

    (d)

    Vorticella and plasmodium

  3. Paramecium and planaria show _____ types of division during asexual reproduction

    (a)

    Transverse binary fission

    (b)

    Longitudinal binary fission

    (c)

    Simple binary fission

    (d)

    Oblique binary fission

  4. ______ refers to the fusion of small sized, morphologically different gametes.

    (a)

    Isogamy

    (b)

    Hologamy

    (c)

    Paedogamy

    (d)

    Merogamy

  5. Which among the following animal is not a continuous breeder?

    (a)

    Hen

    (b)

    Rabbit

    (c)

    Honey bees

    (d)

    Frogs

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

    (a)

    Seminal vesicle

    (b)

    Bulbourethral gland

    (c)

    Prostate gland

    (d)

    Mucous gland

  7. A – Ovulation is the release of ovum from the Graafian follicle.
    R – It occurs during the follicular phase of the menstrual cycle.

    (a)

    A and R are true, R is the correct explanation of A

    (b)

    A and R are true, R is not the correct explanation of A

    (c)

    A is true, R is false

    (d)

    Both A and R are false

  8. Assertion (A): The acrosome of the Sperm cell contains Sperm lysin.
    Reason (R): Sperm lysin destroys the deformed Sperm cells.

    (a)

    R explains A

    (b)

    A is right R is wrong

    (c)

    A an R are right R does not explains A

    (d)

    Both A and R are wrong

  9. Attachment of blastocyst to the uterine wall is called ______

    (a)

    Implantation

    (b)

    Parturition

    (c)

    Insemination

    (d)

    gastrulation

  10. Bulbourethral glands are also called ______

    (a)

    prostate gland

    (b)

    Cowper's gland

    (c)

    Skene's glands

    (d)

    Bartholin's glands

  11. The _____ are modified sweat gland seen in both sexes

    (a)

    Skene's glands

    (b)

    Bartholin's glands

    (c)

    Mammary gland

    (d)

    Cowper's gland

  12. The _____ prevents poly spermy.

    (a)

    vitelline membrane

    (b)

    fertilization membrane

    (c)

    zona pellucida

    (d)

    corona radiata

  13. The hormone ____ brings about powerful contraction of uterine muscles during child birth.

    (a)

    Relaxin

    (b)

    Oestrogen

    (c)

    Progesterone

    (d)

    Oxytocin

  14. Identify the correct statement on 'inhibition'.

    (a)

    is produced by granulose cells in ovary and inhibits the secretion of FSH

    (b)

    is produced by granulose cells in ovary and inhibits the secretion of LH

    (c)

    is produced by nurse cells in testes and inhibits the secretion of LH

    (d)

    inhibits the secretion of LH, FSH and prolactin.

  15. Hormones secreted by placenta to maintain pregnancy are

    (a)

    hCG, hPL, progesterone, estrogen

    (b)

    hCG, hPL, estrogen, relaxin, oxytocin

    (c)

    hCG, hPL, progesterone, prolactin

    (d)

    hCG, progesterone, estrogen, glucocorticoids

  16. Assertion (A): In scrotum, the temperature is maintained 2 - 3°C lower than body temperature.
    Reason (R): Reduced temperature results in efficient sperm production

    (a)

    R explains A.

    (b)

    A is right R is wrong.

    (c)

    A and R are right. R does not explains A

    (d)

    Both A and R are wrong

  17. Organ of copulation in human female is __________________

    (a)

    Cevix

    (b)

    Fundus

    (c)

    Vagina

    (d)

    Uterus

  18. Statement (1): Human pregnancy lasts for 35 weeks.
    Statement (2): During gestation, embryo's heat develops during 12th week

    (a)

    Statement 1 is correct; statement 2 is incorrect

    (b)

    Statement 1 is incorrect; statement 2 is correct

    (c)

    Both the statements 1 and 2 are correct

    (d)

    Both the statements 1 and 2 are correct

  19. What is the role of fimbriae?

    (a)

    Secretion of oestrogen and prolactin.

    (b)

    Helps in the collection of the ovum after ovulation

    (c)

    Attaches the ovary to the abdominal cavity.

    (d)

    Cormects oviduct with ovary

  20. Read the given statements and select the correct option
    and vaults are made of rubber and are inserted into the female reproductive tract to cover the cervix before coitus.
    Statement 2: They are chemical barriers of conception and are reusable.

    (a)

    Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.

    (b)

    Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.

    (c)

    Statement 1 is correct but statement 2 is incorrect

    (d)

    Both statements 1 and 2 are incorrect

  21. Which of the following phenotypes is not possible in the progeny of the parental genotypic combination IAIO X IAIB?

    (a)

    AB

    (b)

    O

    (c)

    A

    (d)

    B

  22. Pataus’ syndrome is also referred to as

    (a)

    13-Trisomy

    (b)

    18-Trisormy

    (c)

    21-Trisormy

    (d)

    None of these

  23. A mRNA molecule is produced by

    (a)

    Replication

    (b)

    Transcription

    (c)

    Duplication

    (d)

    Translation

  24. 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

  25. Exo-erythrocytic schizogony of Plasmodium takes place in _______

    (a)

    RBC

    (b)

    Leucocytes

    (c)

    Stomach

    (d)

    Liver

  26. Cyclosporin – A is an immunosuppressive drug produced from _______

    (a)

    Aspergillus niger

    (b)

    Manascus purpureus

    (c)

    Penicillium notatum

    (d)

    Trichoderma polysporum

  27. Which one of the following statements is true regarding DNA polymerase used in PCR?

    (a)

    It is used to ligate introduced DNA in recipient cells

    (b)

    It serves as a selectable marker

    (c)

    It is isolated from a Virus

    (d)

    d) It remains active at a high temperature

  28. Predation and parasitism are which type of interactions?

    (a)

    (+,+)

    (b)

    (+, O)

    (c)

    (--, --)

    (d)

    (+, --)

  29. Animals that can move from fresh water to sea called as______

    (a)

    Stenothermal

    (b)

    Eurythermal

    (c)

    Catadromous

    (d)

    Anadromous

  30. Who introduced the term biodiversity?

    (a)

    Edward Wilson

    (b)

    Walter Rosen

    (c)

    Norman Myers

    (d)

    Alice Norman

  31. With which of the following, the Agenda 21’ of Rio Summit, 1992 is related to?

    (a)

    Sustainable development

    (b)

    Combating the consequences of population

    (c)

    Mitigation norms of Green House Gases (GHGs) emission

    (d)

    Technology transfer mechanism to developing countries for ‘clean-energy’ production

  32. In the E- waste generated by the Mobile Phones, which among the following metal is most abundant?

    (a)

    Copper

    (b)

    Silver

    (c)

    Palladium

    (d)

    Gold

  33. First cell of male gametophyte in angiosperm is

    (a)

    Microspore

    (b)

    megaspore

    (c)

    Nucleus

    (d)

    Primary Endosperm Nucleus

  34. In Haplopappus gracilis, number of chromosomes in cells of nucellus is 4. What will be the chromosome number in Primary endosperm cell?

    (a)

    8

    (b)

    12

    (c)

    6

    (d)

    2

  35. 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

  36. Fruit colour in squash is an example of

    (a)

    Recessive epistatsis

    (b)

    Dominant epistasis

    (c)

    Complementary genes

    (d)

    Inhibitory genes

  37. The dominant epistatis ratio is

    (a)

    9:3:3:1

    (b)

    12:3:1

    (c)

    9:3:4

    (d)

    9:6:1

  38. Accurate mapping of genes can be done by three point test cross because increases

    (a)

    Possibility of single cross over

    (b)

    Possibility of double cross over

    (c)

    Possibility of multiple cross over

    (d)

    Possibility of recombination frequency

  39. Plasmids are

    (a)

    circular protein molecules

    (b)

    required by bacteria

    (c)

    tiny bacteria

    (d)

    confer resistance to antibiotics

  40. pBR 322, BR stands for

    (a)

    Plasmid Bacterial Recombination

    (b)

    Plasmid Bacterial Replication

    (c)

    Plasmid Boliver and Rodriguez

    (d)

    Plasmid Baltimore and Rodriguez

  41. Totipotency refers to

    (a)

    capacity to generate genetically identical plants.

    (b)

    capacity to generate a whole plant from any plant cell / explant.

    (c)

    capacity to generate hybrid protoplasts.

    (d)

    recovery of healthy plants from diseased plants.

  42. Cryopreservation means it is a process to preserve plant cells, tissues or organs

    (a)

    at very low temperature by using ether.

    (b)

    at very high temperature by using liquid nitrogen

    (c)

    at very low temperature of -196 by using liquid nitrogen

    (d)

    at very low temperature by using liquid nitrogen

  43. Which of the given plant produces cardiac glycosides?

    (a)

    Calotropis

    (b)

    Acacia

    (c)

    Nepenthes

    (d)

    Utricularia

  44. The plant of this group are adapted to live partly in water and partly above substratum and free from water

    (a)

    Xerophytes

    (b)

    Mesophytes

    (c)

    Hydrophytes

    (d)

    Halophytes

  45. Strong, sharp spines that get attached to animal’s feet are found in the fruits of

    (a)

    Argemone

    (b)

    Ecballium

    (c)

    Heritier

    (d)

    Crossandra

  46. Solar energy used by green plants for photosynthesis is only

    (a)

    2 – 8%

    (b)

    2 – 10%

    (c)

    3 – 10%

    (d)

    2 – 9%

  47. With respect to Eichhornia
    Statement A: It drains off oxygen from water and is seen growing in standing water.
    Statement B: It is an indigenous species of our country.

    (a)

    Statement A is correct and Statement B is wrong

    (b)

    Both Statements A and B are correct

    (c)

    Statement A is correct and Statement B is wrong.

    (d)

    Both statements A and B are wrong

  48. While studying the history of domestication of various cultivated plants _______ were recognized
    earlier

    (a)

    Centres of origin

    (b)

    Centres of domestication

    (c)

    Centres of hybrid

    (d)

    Centres of variation

  49. Jaya and Ratna are the semi dwarf varieties of

    (a)

    wheat

    (b)

    rice

    (c)

    cowpea

    (d)

    mustard

  50. New world species of cotton

    (a)

    Gossipium arboretum

    (b)

    G.herbaceum

    (c)

    Both a and b

    (d)

    G.barbadense

*****************************************

TN 12th Standard Biology free Online practice tests

Reviews & Comments about 12th Standard English Medium Biology Reduced Syllabus One mark Important Questions - 2021(Public Exam )

Write your Comment