31. Bipolar axons are found in __
[A] Cerebral cortex
[B] Retina of eye
[C] Embryonic stage
[D] Mesencephalon
Show Answer
Correct Answer: B [Retina of eye]
Notes:
Bipolar neurons are located in the retina of the eye, the roof of the nasal cavity, and the inner ear.
32. Which of the following cells is involved in cell-mediated immunity?
[A] T-cells
[B] B-cells
[C] Mast cells
[D] Both T and B cells
Show Answer
Correct Answer: A [T-cells]
Notes:
T-cells are involved in cell-mediated immunity. T cells are produced in the bone marrow and mature in the thymus.
33. Into how many structural regions is the oviduct divided?
[A] Two
[B] Three
[C] Four
[D] None of these
Show Answer
Correct Answer: B [Three]
Notes:
Into three structural regions is the oviduct divided: ampulla, isthmus, and infundibulum
34. Chickenpox is a highly contagious disease caused by the __
[A] Pasteurella pestis
[B] Bacillus anthracis
[C] Bordetella pertussis
[D] Varicella zoster
Show Answer
Correct Answer: D [Varicella zoster ]
Notes:
Chickenpox is a highly contagious disease caused by the varicella zoster virus.
35. An individual’s collection of genes is called?
[A] Genotype
[B] Phenotype
[C] Trait
[D] None of the above
Show Answer
Correct Answer: A [Genotype]
Notes:
A genotype is a collection of genes of an individual. The term can also refer to two alleles inherited for a particular gene. The genotype is expressed when the information encoded in the gene’s DNA is used to make proteins and RNA molecules.
36. 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.
37. Which of the following is the method of cellular defense in animals and plants?
[A] Recombinant DNA technology
[B] RNA interference
[C] Immune response
[D] Mutation
Show Answer
Correct Answer: B [RNA interference]
Notes:
RNA interference is the method of cellular defense in animals and plants.
38. The sexual reproductive organs of aspergillus are
[A] Antheridium and Oogonium
[B] Spermatium and Ascogonium
[C] Spermatium and Oogonium
[D] Antheridium and Ascogonium
Show Answer
Correct Answer: D [Antheridium and Ascogonium]
Notes:
Sexual reproduction in Aspergillus is rare and takes place in favourable conditions. Sex organs are produced on the same mycelium which has produced conidia. Male organs are called Antheridium or Pollinoduim and female are called archicarp or Ascogonium. Female organs develop as a branch of hypha. The antheridium curves round and bend towards the apex of archicarp as a result of which they become spirally coiled and their tips get fused.
39. Which angiosperm is vesselless?
[A] Maize
[B] Trochodendron
[C] Hydrilla
[D] Wheat
Show Answer
Correct Answer: B [Trochodendron]
Notes:
Trochodendron is a genus of flowering plants with one living species. It is vesselless angiosperm. Fewer than 200 species of angiosperms have the primitive feature of vesselless wood. With two exceptions— Trochodendron and Tetracentron; all vesselless angiosperms occur in the Magnolidae.
40. Which among the following constitutes the central nervous system in human body?
[A] Only brain
[B] Only blood
[C] Only spinal cord
[D] Both brain and spinal cord
Show Answer
Correct Answer: D [Both brain and spinal cord]
Notes:
The central nervous system (CNS) controls most functions of the body and mind. It consists of two parts: the brain and the spinal cord. Both the brain and spinal cord are protected by a three-layered covering of connective tissuecalled the meninges.
