31. Listeriosis is a serious infection caused by __
[A] Listeria pestis
[B] Listeria monocytogenes
[C] Listeria papillomavirus
[D] None of these
Show Answer
Correct Answer: B [Listeria monocytogenes]
Notes:
Listeriosis is a serious infection caused by Listeria monocytogenes. It is caused by eating food contaminated with the bacterium Listeria monocytogenes.
32. Which of the following conditions aggravate fungal diseases?
[A] Heat and moisture
[B] Cold and dry
[C] Humid and Cold
[D] Scorching heat
Show Answer
Correct Answer: A [Heat and moisture]
Notes:
Heat and moisture conditions aggravate fungal diseases. Fungal diseases are also known as mycosis.
33. The point mutation results in a change in the codon, which then codes for another amino acid is called __
[A] Silent mutation
[B] Nonsense mutation
[C] Missense mutation
[D] None of these
Show Answer
Correct Answer: C [Missense mutation]
Notes:
The point mutation results in a change in the codon, which then codes for another amino acid is called Missense mutation.
34. Bt toxin is produced by a bacterium called __.
[A] Bacillus thuringiensis
[B] Bacillus anthracis
[C] Bacillus thermophilus
[D] Bacillus subtilis
Show Answer
Correct Answer: A [Bacillus thuringiensis]
Notes:
Bt toxin is produced by a bacterium called Bacillus thuringiensis.
35. Which of the following is an enzyme that cleaves proteins?
[A] protease
[B] RNase
[C] lipase
[D] Dnase
Show Answer
Correct Answer: A [protease]
Notes:
Protease is an enzyme that cleaves proteins. These enzymes are made by animals, plants, fungi, and bacteria.
36. A molecule in plants comparable to haemoglobin in animals is ____:
[A] Carotene
[B] Chlorophyll
[C] Cellulose
[D] Cytochrome
Show Answer
Correct Answer: B [Chlorophyll]
Notes:
Haemoglobin is the iron-containing oxygen transporting metalloprotein in the red blood cells of all vertebrates. Similarly, Cytochromes are, in general, membrane-bound haemo-proteins containing heme groups and are primarily responsible for the generation of ATP via electron transport.
37. The only bird that flies backward is ____:
[A] Koel (Cuckoo)
[B] Sparrow
[C] Siberian Crane
[D] Hummingbird
Show Answer
Correct Answer: D [Hummingbird]
Notes:
A humming bird the smallest of all known birds can rotate each of its wings in a circle, allowing them to be the only bird which can fly forwards, backwards, up, down, sideways or sit in sheer space. To hover, humming birds move their wings forward and backward in a repeated figure eight.
38. Self pollination will lead to
____:
[A] Inbreeding
[B] Overbreeding
[C] Outbreeding
[D] Rare breeding
Show Answer
Correct Answer: A [Inbreeding]
Notes:
Self-pollination can lead to inbreeding depression, or the reduced vitality in the species along with reduced chances of variation among members of species. This is why many flowers that could potentially self-pollinate have a built-in mechanism to avoid it.
39. With which one of the following Jacobsons organ is related to?
[A] Vision
[B] Chewing
[C] Hearing
[D] Smelling
Show Answer
Correct Answer: D [Smelling]
Notes:
Jacobson’s organ, also called vomero-nasal organ, is a patch of sensory cells within the main nasal chamber that detects heavy moisture-borne odour particles. It is a “sense of smell” receptor that is actually not receptive to ordinary odours.
40. White lung disease is prevalent among the workers of ____:
[A] Cotton industry
[B] Cement industry
[C] Pesticide industry
[D] Paper industry
Show Answer
Correct Answer: A [Cotton industry]
Notes:
White lung shows acute lung injury characterized by coughing inflammation of the lungs which become stiff and fibrous and cannot exchange oxygen. It occurs among persons exposed to irritants such as corrosive chemical vapor or ammonia or chlorine etc. Brown lung, or bysinnois, similar to black lung (pneumoconiosis) and white lung (asbestosis) disease among coal miners and shipyard workers and workers in textile industry exposed to asbestos are well known occupational hazards.
