31. What does the liver do to help digestion?
[A] Makes important enzymes
[B] Neutralizes stomach acid
[C] Produces bile
[D] Regulates insulin
Show Answer
Correct Answer: C [Produces bile]
Notes:
The liver makes a digestive juice called bile that helps digest fats and certain vitamins.
32. What causes black quarter in cattle?
[A] Euphorbia tirucalli
[B] Clostridium chauvoei
[C] Bacillus anthracis
[D] None of these
Show Answer
Correct Answer: B [Clostridium chauvoei]
Notes:
Clostridium chauvoei causes black quarter in cattle. It is an acute and highly fatal disease.
33. What is the renewable energy source produced by the breakdown of organic matter by some bacteria under anaerobic conditions called?
[A] Bioethanol
[B] Biogas
[C] Biofertilizer
[D] None of these
Show Answer
Correct Answer: B [Biogas]
Notes:
The renewable energy source produced by the breakdown of organic matter by some bacteria under anaerobic conditions is called Biogas. This is a mixture of methane, hydrogen, and carbon dioxide.
34. Bacteria protect themselves from viruses by fragmenting viral DNA?
[A] Ligase
[B] Endonuclease
[C] Exonuclease
[D] Gyrase
Show Answer
Correct Answer: C [Exonuclease]
Notes:
Bacteria protect themselves from viruses by fragmenting viral DNA with Exonuclease. Enzymes that work by cleaving one nucleotide at a time from the end (Exo) of the polynucleotide chain are called exonucleases.
35. Who was the father of the green revolution?
[A] Verghese Kurien
[B] Herbert Boyer
[C] Har Gobind Korana
[D] Norman Borlaug
Show Answer
Correct Answer: D [Norman Borlaug]
Notes:
Norman Borlaug was the father of the green revolution.
36. Lungs are the primary organs of ____:
[A] Digestion
[B] Respiration
[C] Constipation
[D] Perspiration
Show Answer
Correct Answer: B [Respiration]
Notes:
The lungs are the primary organs of respiration in humans and many other animals including a few fish and some snails. Their function in the respiratory system is to extract oxygen from the atmosphere and transfer it into the bloodstream, and to release carbon dioxide from the bloodstream into the atmosphere, in a process of gas exchange.
37. Which of the following bacterium causes crown gall disease in plants?
[A] Agrobacterium tumefaciens
[B] Pseudomonas fluorescens
[C] Bacillus thurigiensis
[D] None of the above
Show Answer
Correct Answer: A [Agrobacterium tumefaciens]
Notes:
Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die. In science of Biotechnology, it is considered as natural engineer.
38. Which one of the following is not a true fish?
[A] Jellyfish
[B] Starfish
[C] Cuttlefish
[D] All of the above
Show Answer
Correct Answer: D [All of the above ]
Notes:
The term fish is most strictly used to describe any animal with a backbone that has gills throughout life and has limbs, if any, in the shape of fins. Many types of aquatic animals commonly referred to as fish are not fish in this strict sense; examples include shellfish, cuttlefish, starfish, crayfish and jellyfish.
39. What is the transplantation of graft between genetically identical individuals?
[A] Autograft
[B] Xenograft
[C] Iso-graft
[D] Allograft
Show Answer
Correct Answer: C [Iso-graft]
Notes:
An isogenic graft or Isograft is a graft between genetically identical individuals (i.e. monozygotic twins). This type of graft donot pose any form of tissue rejection threat by recipient’s body.
40. Commonest mammal is ____:
[A] Elephant
[B] Lion
[C] Human
[D] Panther
Show Answer
Correct Answer: C [Human]
Notes:
Humans are likely the most numerous species of mammal on Earth at the moment.
