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12th Standard Biology English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Four

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 mode of reproduction variations are seen

    (a)

    Asexual

    (b)

    Parthenogenesis

    (c)

    Sexual

    (d)

    Both a and b

  2. External fertilization is seen is ______

    (a)

    Mammals and birds

    (b)

    Reptiles and sponges

    (c)

    Fishes and birds

    (d)

    Sponges and amphibians

  3. Paedogenetic parthenogenesis is seen in ______

    (a)

    planula larvae of enidarians

    (b)

    Cydippid larvae of pleurobranchia

    (c)

    Redia larvae ofliver fluke

    (d)

    Trochophore larvae of Annelids

  4. Colostrum is rich in

    (a)

    Ig E

    (b)

    Ig A

    (c)

    Ig D

    (d)

    Ig M

  5. This technique is used to diagnose the chromosomal abnormities.

    (a)

    Assisted Reproductive Technology (ART)

    (b)

    Micro Testicular Sperm Extraction

    (c)

    Amniocentesis

    (d)

    GIFT

  6. Which blood group doesn't possess antibodies?

    (a)

    IAIB

    (b)

    IOIO

    (c)

    IAO

    (d)

    IBIB

  7. Sudden appearance of vestigial organs in highly evolved organisms is called

    (a)

    Vestigial organs

    (b)

    Connecting link

    (c)

    Atavistic organs

    (d)

    Adaptive radiation

  8. During sewage treatment, biogas are produced which includes

    (a)

    Methane, hydrogen sulphide, carbon dioxide

    (b)

    Methane, oxygen, hydrogen sulphide

    (c)

    Hydrogen sulphide, methane, sulphur dioxide

    (d)

    Hydrogen sulphide, nitrogen, methane

  9. The colonies of recombinant bacteria appear white in contrast to blue colonies of nonrecombinant bacteria because of

    (a)

    Non-recombinant bacteria containing β galactosidase.

    (b)

    Insertional inactivation of α-galactosidase in non-recombinant bacteria.

    (c)

    Insertional inactivation of α-galactosidase in recombinant bacteria.

    (d)

    Inactivation of glycosidase enzyme in recombinant bacteria

  10. The relationship between sucker fish and shark is__________

    (a)

    Competition

    (b)

    Commensalism

    (c)

    Predation

    (d)

    Parasitism.

  11. An association of individuals of different species living in the same habitat and having functional interaction is:

    (a)

    Biotic community

    (b)

    Ecosystem

    (c)

    Population

    (d)

    Ecological niche

  12. Identify the incorrect statement

    (a)

    Water is a universal solvent

    (b)

    Water has less surface tension

    (c)

    Water is heavier than air

    (d)

    When freezes water contracts

  13. Which of the following forests is known as the lungs of the planet earth?

    (a)

    Tundra forest

    (b)

    Rain forest of north east India

    (c)

    Taiga forest

    (d)

    Amazon rain forest

  14. Mundanthurai wild life sanctuary is located in ___________ district.

    (a)

    Coimbatore

    (b)

    Tirunelveli

    (c)

    Kancheepuram

    (d)

    Nagapattinam

  15. Which is not an accepted biodiversity hotspots of India?

    (a)

    Indian Himalayas

    (b)

    Western Ghats

    (c)

    Indo-Burma

    (d)

    Deccan Plateau

  16. The Hydrochlorofluorocarbons (HCFCs) are the compounds which have the following molecules:

    (a)

    Hydrogen

    (b)

    Carbon

    (c)

    Chlorine

    (d)

    Fluorine

  17. Test cross involves

    (a)

    Crossing between two genotypes with recessive trait

    (b)

    Crossing between two F1 hybrids

    (c)

    Crossing the F1 hybrid with a double recessive genotype

    (d)

    Crossing between two genotypes with dominant trait

  18. In his classic experiments on Pea plants, Mendel did not use

    (a)

    Flowering position

    (b)

    Seed colour

    (c)

    Pod length

    (d)

    Seed shape

  19. Pure tall plants are crossed with pure dwarf plants. In the F1 generation, all plants were tall. These tall plants of F1 generation were selfed and the ratio of tall to dwarf plants obtained was 3:1. This is called

    (a)

    Dominance

    (b)

    Inheritance

    (c)

    Codominance

    (d)

    Heredity

  20. If haploid number in a cell is 18. The double monosomic and trisomic number will be

    (a)

    35 and 37

    (b)

    34 and 37

    (c)

    37 and 35

    (d)

    17 and 19

  21. Find the wrongly matched pair.

    (a)

    Endemism - Species confined to a region and not found anywhere else.

    (b)

    Hotspots - Western ghats

    (c)

    Ex-situ Conservation - Zoological parks

    (d)

    Sacred groves - Saintri hills of Rajasthan

    (e)

    Alien sp. Of India - Water hyacinth

  22. People’s movement for the protection of environment in Sirsi of Karnataka is

    (a)

    Chipko movement

    (b)

    Amirtha Devi Bishwas movement

    (c)

    Appiko movement

    (d)

    None of the above

  23. The quickest method of plant breeding is

    (a)

    Introduction

    (b)

    Selection

    (c)

    Hybridization

    (d)

    Mutation breeding

  24. Which one of the following are the species that are crossed to give sugarcane varieties with high sugar, high yield, thick stems and ability to grow in the sugarcane belt of North India?

    (a)

    Saccharum robustum and Saccharum officinarum

    (b)

    Saccharum barberi and Saccharum officinarum

    (c)

    Saccharum sinense and Saccharum officinarum

    (d)

    Saccharum barberi and Saccharum robustum

  25. Statement A: Coffee contains caffeine
    Statement B: Drinking coffee enhances cancer

    (a)

    A is correct, B is wrong

    (b)

    A and B – Both are correct

    (c)

    A is wrong, B is correct

    (d)

    A and B – Both are wrong

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