Biology MCQs

1. The Stomata in the aquatic plants is ________?
[A] Not Found
[B] Found & available on both the surfaces
[C] Found & available on upper surface only
[D] Found and available only on lower surface

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2. Which among the following is the right location of foramen magnum ?
[A] In the Pectoral girdle
[B] Interior region of skull
[C] Posterior region of skull
[D] None of the above

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3. Which among the following function as locus of biochemical reactions?
[A] Cell plasma
[B] Cell membrane
[C] Cell walls
[D] None of the above

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4. The animals of which of the following sets are collectively called as Elasmobranches?
[A] Shark, Skates and Rays
[B] Shark, Rays and Dolphins
[C] Shark, Skates and Dolphins
[D] Skates, Dolphins and Rays

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5. What do we call the drugs that bind to the receptor site and inhibit its natural function?
[A] agonists
[B] antagonists
[C] antibiotics
[D] None of the above

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

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7. Who among the following analysed the DNA for the first time ?
[A] Watson and Krick
[B] Karl von Frisch
[C] M. W. Nirenberg
[D] Hargobind Khurana

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8. Which of the following are the postulates of Darwin’s theory of evolution?
[A] Within any population, there is natural variation.
[B] Even though all species produce a large number of offsprings, populations remain fairly constant
[C] The struggle for survival within populations eliminates the unfit individuals.
[D] All the above are correct

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9. Which of the following is the first formed primary xylem elements?
[A] Protoxylem
[B] Xylem parenchyma
[C] Metaxylem
[D] Xylem fibres

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10. The vocal cords in men are about how many mm long?
[A] 40mm
[B] 20mm
[C] 10mm
[D] 30mm

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