31. Which of the following is called the end part of the oviduct?
[A] isthmus
[B] ampulla
[C] ostium
[D] thalamus
Show Answer
Correct Answer: A [isthmus]
Notes:
Isthmus is called the end part of the oviduct. It is a narrow strip of land that connects two larger landmasses and separates two bodies of water.
32. Which property is not exhibited by a disease-causing pathogen?
[A] Invasiveness
[B] Toxigenicity
[C] Virulence
[D] Co-operation
Show Answer
Correct Answer: C [Virulence]
Notes:
Cooperation is a property that is not exhibited by pathogens. Whereas The invasion of a pathogen is the ability of a host to gain entry and multiply. A virus is the ability of a pathogen to cause disease. Toxicity is the power of a pathogen to form toxins capable of harming host cells.
33. In incomplete dominance__.
[A] Phenotype of both alleles is expressed
[B] Phenotype of only one allele is expressed
[C] Phenotype of neither of the alleles are expressed
[D] Phenotype of both alleles is partially expressed
Show Answer
Correct Answer: D [Phenotype of both alleles is partially expressed]
Notes:
In incomplete dominance, the phenotype of both alleles is partially expressed.
34. Azolla enriches rice fields with nitrogen due to its association with?
[A] Anabaena
[B] Nostoc
[C] Rhizobium
[D] Frankia
Show Answer
Correct Answer: A [Anabaena]
Notes:
Azolla enriches rice fields with nitrogen due to its association with Anabaena.
35. Which of the following are the main sources of biofertilizers?
[A] bacteria
[B] cyanobacteria
[C] fungi
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Bacteria, cyanobacteria and fungi are the main sources of biofertilizers. These trap atmospheric nitrogen and reduce it to ammonia and make it available to plants. They also convert insoluble phosphates into forms required by plants.
36. Sugar crops to produce __
[A] biomethane
[B] bioethanol
[C] biobutanol
[D] None of these
Show Answer
Correct Answer: B [bioethanol]
Notes:
Bioethanol is produced by fermentation of residues from corn, potatoes, cereals, sugar beets, sugarcane and vegetables.
37. What are the two main technologies that enabled the birth of modern biotechnology?
[A] red biotechnology and green biotechnology
[B] classical and traditional biotechnology
[C] genetics and mathematics
[D] genetic engineering and maintenance of a sterile environment
Show Answer
Correct Answer: D [genetic engineering and maintenance of a sterile environment]
Notes:
Genetic engineering and maintenance of a sterile environment are the two main technologies that enabled the birth of modern biotechnology.
38. Which of the following is a mobile genetic element?
[A] virus
[B] bacteria
[C] Transposons
[D] insertion sequence
Show Answer
Correct Answer: C [Transposons ]
Notes:
A transposon is a mobile genetic element. This is also known as jumping genes. A type of genetic material that can move around within a genome is called a mobile genetic element.
39. In male sharks, Claspers are found attached to
____:
[A] Anal fin
[B] Ventral fin
[C] Pectoral fin
[D] Pelvic fin
Show Answer
Correct Answer: D [Pelvic fin]
Notes:
Claspers are organs found in male elasmobranchs. Each male has two claspers. They are located along the inner side of the shark or ray’s pelvic fin and are used in reproduction. During mating, the male deposits his sperm into the female’s cloaca (the opening that serves as the entrance to the uterus, intestine and urinary tract) via grooves that lie in the upper side of the claspers.
40. Hepatitis is a ____:
[A] Lung disease
[B] Liver disease
[C] Kidney disease
[D] Heart disease
Show Answer
Correct Answer: B [Liver disease]
Notes:
Hepatitis is a medical condition defined by the inflammation of the liver and characterized by the presence of inflammatory cells in the tissue of the organ. The condition can be self-limiting (healing on its own) or can progress to fibrosis (scarring) and cirrhosis.
