31. Which of the following can cause hepatitis?
[A] an improperly functioning immune system
[B] alcohol and medicines
[C] viruses
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
An improperly functioning immune system, alcohol, medicines, and viruses can cause hepatitis. This is a viral disease, that causes hepatic anorexia resulting in liver damage or jaundice.
32. Which of the following is VAM?
[A] Bioinsecticide
[B] Bioherbicide
[C] Endomycorrhiza
[D] Ectomycorrhiza
Show Answer
Correct Answer: C [Endomycorrhiza]
Notes:
VAM is Vesicular Arbuscular Mycorrhizal. It is formed by the symbiotic association between certain phycomycetous fungi and angiosperm roots.
33. The conversion of N2 to ammonia is known as __
[A] Nitrification
[B] Nitrogen fixation
[C] Ammonification
[D] Denitrification
Show Answer
Correct Answer: B [Nitrogen fixation]
Notes:
The conversion of N2 to ammonia is known as Nitrogen fixation.
34. Biotechnology has been defined by which of the following?
[A] The European Federation of Biotechnology (EFB)
[B] National Center for Biotechnology Information (NCBI)
[C] National Institutes of Health (NIH)
[D] National Centre for Cell Science (NCCS)
Show Answer
Correct Answer: A [The European Federation of Biotechnology (EFB)]
Notes:
Biotechnology has been defined by The European Federation of Biotechnology (EFB).
35. Approximately how many pairs are there in the human genome?
[A] 6 billion base pairs
[B] 5 billion base pairs
[C] 3 billion base pairs
[D] 4 billion base pairs
Show Answer
Correct Answer: C [3 billion base pairs]
Notes:
Approximately 3 billion base pairs are there in the human genome. The complete set of nucleic acid sequences for humans encoded as DNA within 23 chromosome pairs in the cell nucleus and a small DNA molecule found within individual mitochondria is called the human genome.
36. The pigment that gives human skin, hair and eyes their colour is called ____:
[A] Quinacridone
[B] Alizarin
[C] Melanin
[D] Phthalocyanine
Show Answer
Correct Answer: C [Melanin ]
Notes:
The pigment that gives human skin, hair, and eyes their color. Dark-skinned people have more melanin in their skin than light-skinned people have. Melanin is produced by cells called melanocytes. Everyone has the same number of melanocytes, but some people make more melanin than others.
37. Animals with Chitinous exoskeleton are ____:
[A] Sea-Urchin
[B] Insects
[C] Sponges
[D] Snails
Show Answer
Correct Answer: B [Insects]
Notes:
Chitin is the main component of the cell walls of fungi, the exoskeletons of arthropods such as crustaceans (e.g., crabs, lobsters and shrimps) and insects, the radulas of molluscs, and the beaks and internal shells of cephalopods, including squid and octopuses. Combined with calcium carbonate, as in the shells of Crustacean and molluscs, chitin produces a much stronger composite for protection.
38. The number of heart beats on an average in an adult human is in the range of ___:
[A] 60-65
[B] 66-70
[C] 71-80
[D] 85-90
Show Answer
Correct Answer: C [71-80]
Notes:
The average heart rate for adult humans is about 70 to 75 beats per minute in a normal relaxed mode. While we tend to think of the “normal” heart beat rate as being “72 beats per minute”, in actuality the heart beat rate is not and could never be constant.
39. Total number of muscles present in our body is ____:
[A] 556
[B] 565
[C] 656
[D] 665
Show Answer
Correct Answer: C [656]
Notes:
The number of muscles in the human body varies from about 656 to 850 (sometimes from 639 to around 800). An exact number is difficult to define because different sources group the muscles differently. Moreover, that some muscles, such as Palmaris longus, are not always present.
40. Brain receives and sends signals in the form of ____:
[A] Electrical impulses
[B] Magnetic impulses
[C] Mechanical impulses
[D] Chemical impulses
Show Answer
Correct Answer: A [Electrical impulses]
Notes:
The human brain sends messages to other parts of the body through a network of connecting wires (neurons) called the nervous system. Neurons carry messages in the form of electrical signals called nerve impulses. The human brain contains about 100 billion neurons.
