31. What is the cause of footrot?
[A] Naegleria fowleri
[B] Bordetella pertussis
[C] Dichelobacter nodosus
[D] Pasteurella pestis
Show Answer
Correct Answer: C [Dichelobacter nodosus]
Notes:
Dichelobacter nodosus bacteria is the cause of footrot. It is a common cause of lameness in cattle.
32. Which of the following is not a Degenerative disease?
[A] Hypertension
[B] Atherosclerosis
[C] Obesity
[D] Alzheimer’s disease
Show Answer
Correct Answer: C [Obesity]
Notes:
Obesity is not a Degenerative disease. Degenerative diseases are those diseases, which occur due to aging and result in malfunction or deficiency.
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. How many approaches are there in order to clone the complete genome?
[A] 1
[B] 2
[C] 3
[D] 4
Show Answer
Correct Answer: B [2]
Notes:
There are basically two approaches to cloning the entire genome. In the first approach, systematic cloning is performed and the second approach is based on randomly cloning overlapping fragments.
35. Which of the following causes Black Fever?
[A] Leischmania
[B] E.Coli
[C] Azatobactor
[D] Clostridium
Show Answer
Correct Answer: A [Leischmania]
Notes:
Kala-azar is a parasitic disease that is confined to humans which is caused by the Leishmania donovani parasite. It is harboured by an insect called the sand-fly. The term “kala-azar” comes from India where it is the Hindi for black fever. The name “Leischmania donovani” honors two men: the British pathologist William Boog Leishman who in 1903 wrote about the protozoa that causes kalaazar and the researcher C. Donovan, who made the same discovery independently the same year.
36. Membrane lipids of chillsensitive plants contain ____:
[A] Low proportion of saturated fatty acids
[B] Equal proportion of saturated and unsaturated fatty acids
[C] Low proportion of unsaturated fatty acids
[D] High proportion of unsaturated fatty acids
Show Answer
Correct Answer: D [High proportion of unsaturated fatty acids]
Notes:
The membranes of chill sensitive plants have about a 2 :1 ratio of unsaturated to saturated fatty acids. It has been seen that the proportion of unsaturated membrane fatty acids increases and the critical temperature decreases so that chill-sensitive plants are more acclimitized to low temperatures.
37. Jellyfish are an example of which type of phylum?
[A] Phylum -Protozoa
[B] Phylum -Porifera
[C] Phylum – Cnidaria
[D] Phylum -Ctenophora
Show Answer
Correct Answer: C [Phylum – Cnidaria]
Notes:
Cnidarian, also called coelenterate, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9,000 living species. ? Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans.
38. The development of a fruit without fertilization is called ____:
[A] Apomixis
[B] Parthenocarpy
[C] Hybridogenesis
[D] Gametogamy
Show Answer
Correct Answer: B [Parthenocarpy]
Notes:
Parthenocarpy is the development of fruit without fertilization of seeds. In nature, parthenocarpy occurs as a mutation. Another biological mechanism stenospermacarpy also produces seedless fruits, but here the seeds are aborted while they are still small. In nature, parthenocarpy occurs as a mutation. Some plants require pollination or stimulation for parthenocarpy. This is known as stimulative parthenocarpy.
39. The special modified epidermal cells surrounding stomatal pore are called ____:
[A] Accessory cells
[B] Epithelial cells
[C] Guard cells
[D] Subsidiary cells
Show Answer
Correct Answer: C [Guard cells]
Notes:
The pore is bordered by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the opening. Guard cells are specialized cells in the epidermis of leaves, stems and other organs that are used to control gaseous exchange and rate of transpiration.
40. Consider the following statements about how plants absorb nitrogen:
- Plants absorb nitrogen in the form of inorganic nitrates or nitrites.
- Plants take in nitrogen in the form of organic compounds.
- Nitrogen is directly taken up by the plants from the atmosphere.
Which of the above statements is / are correct?
[A] Only 1 and 2
[B] Only 1 and 3
[C] Only 2 and 3
[D] All of these
Show Answer
Correct Answer: A [Only 1 and 2]
Notes:
Plants obtain nitrogen through their roots. In the soil, nitrifying bacteria change ammonia into nitrite (NO2 –) and then into nitrate (NO3 –), this process is known as nitrification. Furthermore, plants also absorb nitrogen in an organic form. Several organic compounds (compounds containing carbon) constitute the organic fraction of nitrogen in the soil. The organic matter in the soil exists as decomposing plant and animal residues, relatively stable decomposition-resistant compounds, and humus. The abundance of various forms of nitrogen can be altered by plant roots through the change in pH and secretion of organic compounds or oxygen.
