31. Syphilis is a bacterial infection usually spread by __
[A] Sexual contact
[B] Wound infection
[C] Air-borne droplets
[D] None of these
Show Answer
Correct Answer: A [Sexual contact]
Notes:
Syphilis is a bacterial infection mostly spread by sexual contact. It is caused by Treponema pallidum bacteria.
32. Mendel did not give __.
[A] Concept of genes
[B] Concept of inheritance
[C] Concept of dominance
[D] Concept of chromosomes
Show Answer
Correct Answer: D [Concept of chromosomes]
Notes:
Mendel did not give the Concept of chromosomes. The chromosomal theory of inheritance was given by Boveri and Sutton.
33. A trait produced by the effect of a gene or an allele is called__
[A] Oncogenic Trait
[B] Monogenic trait
[C] Polygenic trait
[D] None of these
Show Answer
Correct Answer: B [Monogenic trait]
Notes:
A trait produced by the effect of a gene or an allele is called a Monogenic trait.
34. Where is compound manure made?
[A] Rotted vegetable and animal refuse
[B] Farmyard manure and green manure
[C] Farm refuse and household refuse
[D] Organic wastes from which biogas has been extracted
Show Answer
Correct Answer: A [Rotted vegetable and animal refuse]
Notes:
Compound manure is made of Rotted vegetables and animal refuse. A fertilizer that contains two or more nutrients and is also known as a multi-nutrient fertilizer is called Compound manure.
35. 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.
36. Which of the following can use molecular nitrogen as a nutrient?
[A] Methanomonas
[B] Mucor
[C] Rhizobium
[D] Spirogyra
Show Answer
Correct Answer: C [Rhizobium]
Notes:
Rhizobium is used molecular nitrogen as a nutrient. It is one of the vital symbiotic nitrogen-fixing bacteria.
37. The vitamin which is very labile and easily destroyed during cooking as well as storage is vitamin ____:
[A] Vitamin D
[B] Vitamin C
[C] Vitamin K
[D] Vitamin B6
Show Answer
Correct Answer: B [Vitamin C]
Notes:
Vitamin C is quite unstable when cooked or stored improperly. It is very liable and easily destroyed during cooking as well as storage. It is a water-soluble and temperature-sensitive vitamin, so is easily degraded during cooking, and elevated temperatures and long cooking times have been found to cause particularly severe losses of vitamin C.
38. Protein part of enzyme is known as ____:
[A] Isoenzyme
[B] Holoenzyme
[C] Apoenzyme
[D] All of the above
Show Answer
Correct Answer: C [Apoenzyme]
Notes:
Enzymes are defined as biological catalysts. Chemically all enzymes are globular proteins. Each enzyme catalyses only one chemical reaction. Protein part of enzyme is known as Apoenzyme. It forms an active enzyme system by combination with a coenzyme and determines the specificity of this system for a substrate.
39. Which of the following micro-organism causes diseases like polio and chicken pox?
[A] Protozoa
[B] Bacteria
[C] Virus
[D] Algae
Show Answer
Correct Answer: C [Virus]
Notes:
Both polio and chicken pox are caused by virus. Poliomyelitis, often called polio or infantile paralysis, is an infectious disease caused by the poliovirus; while, Chickenpox, also known as varicella, is a highly contagious disease caused by the initial infection with varicella zoster virus (VZV).
40. Which one of the following is an X-linked, recessive disorder caused by the deficiency of functional plasma clotting factor VIII (FVIII), which may be inherited or arise from spontaneous mutation?
[A] Venous Thrombosis
[B] Haemophilia A
[C] Multiple Myeloma
[D] Leukaemia
Show Answer
Correct Answer: B [Haemophilia A]
Notes:
Haemophilia A is an X-linked, recessive disorder caused by deficiency of functional plasma clotting factor VIII (FVIII), which may be inherited or arise from spontaneous mutation. Although it is passed down from parents to children, about 1/3 of cases are caused by a spontaneous mutation, a change in a gene.
