Biology MCQs

31. The main function of the cornea present in the human eye is__:
[A] structural support to the eye
[B] bends light before it reaches the lens
[C] changes the shape of the lens enabling image to be focused on the retina
[D] contains a concentrated amount of cone cells on the correct orientation

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32. What is the purpose of the rib cage?
[A] protect the stomach
[B] protect the spinal cord

[C] protect the heart and lungs
[D] provide an object to which the lungs can attach

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33. Approximately how many liters of blood does the heart pump throughout the body in a day?
[A] 9.7 litres
[B] 7.7 litres
[C] 5.7 litres
[D] 3.7 litres

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34. Which of the following is used to absorb fluids and salts remaining after the completion of intestinal digestion and absorption and to mix its contents with a lubricating substance, mucus?
[A] Cecum
[B] Colon
[C] Rectum
[D] None of these

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35. A renewable, biodegradable fuel that is manufactured from vegetable oils and animal fats are called __
[A] Bioethanol
[B] Biomethane
[C] Biodiesel
[D] None of these

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36. What is an autonomously repeating circular extra-chromosomal DNA?
[A] Bacteria
[B] Nitrogenous base
[C] RNA
[D] Plasmid

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37. What is another name of rDNA technology?
[A] chimeric DNA
[B] information technology
[C] information DNA
[D] chimeric technology

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38. Epidermal cells of which part of plant often secrete a waxy water resistant layer on their outer surface?
[A] Aerial parts only
[B] Roots only
[C] Both aerial parts and roots
[D] Neither aerial parts nor roots

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39. Which one of the following features is absent in a virus?
[A] Presence of cell wall
[B] Reproduce within host cell
[C] Fully parasitic in nature
[D] Presence of either DNA or RNA

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40. In male sharks, Claspers are found attached to
____:
[A] Anal fin
[B] Ventral fin
[C] Pectoral fin
[D] Pelvic fin

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