Biology MCQs

11. Which plants grow under water stress conditions of deserts?
[A] Epiphytes
[B] Xerophytes
[C] Sciophytes
[D] Heliophytes

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12. A cell increases in volume when it is placed in which of the following?
[A] Hypotonic solution
[B] Isotonic solution
[C] Hypertonic solution
[D] None of the above

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13. Which of the following is the smallest known prokaryotic organism?
[A] Mycoplasma
[B] Bacteria
[C] Chlorella
[D] Microcystis

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14. How many vocal cords are there in the human voice box?
[A] one
[B] Three
[C] Two
[D] Four

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15. Conception generally takes place at which of the following times?
[A] Menses
[B] Before menses
[C] Immediately after menses
[D] Two weeks after menses

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16. Sex of a child is determined by which of the following?
[A] Chromosomes of father
[B] Chromosomes of mother
[C] Rh factor of parents
[D] None of these

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17. Which one of the following is useful for biological control of pests?
[A] Honey bees and locusts
[B] Scorpions and spiders
[C] Wasps and birds
[D] Parrots and kites

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18. Which of the following defines an Antigen?
[A] destroys harmful bacteria
[B] is used to treat poisoning
[C] lowers body-temperature
[D] stimulates formation of antibody

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19. Which gas is absorbed by the plants during photosynthesis?
[A] Oxygen
[B] Carbon dioxide
[C] Nitrogen
[D] Hydrogen

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20. What is Georgios Papanikolaou famous for?
[A] As an inventor of Odometer
[B] As an inventor of Pointed arch bridge
[C] As an inventor of Counterweight Trebuchet
[D] As an inventor of Pap smear test

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