[Solution] – Friday Science Quiz #7

Hello Everyone, Please find the solutions of Friday Science Quiz #7.

Q.1) Italian varieties of Honey bee are used for commercial production of Honey. This is due to
1. They have high collection capacity
2. They sting less
3. They stay in beehive longer periods.

Select the correct answer using the codes given below.
a) 2 only
b) 1 and 2 only
c) 2 and 3 only
d) 1, 2 and 3

Ans – [D]
Explanation – It is taken verbatim from class 9 NCERT page 213. All three are reasons of it.

Q.2) Consider the following statements.
1. In organic farming there is no or minimal use of fertilizers while other things such as pesticides and insecticides are commonly used.
2. Blue green algae is used in preparation of Bio-fertilizers.

Select the correct answer using the codes given below.
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

Ans – [B]
Explanation – Organic farming is a farming system with minimal or no use of chemicals as fertilizers, herbicides, pesticides etc. and with a maximum input of organic manures, recycled farm-wastes (straw and livestock excreta), use of bio-agents such as culture of blue green algae in preparation of bio-fertilizers, neem leaves or turmeric specifically in grain storage as bio-pesticides, with healthy cropping systems.

Q.3) It is harder to make anti viral medicines than antibiotics due to
a) Viruses are very complex organisms to understand
b) Viruses have very effective resistance mechanism
c) Viruses have few biochemical reactions of their own
d) All of the above

Ans-[C]
Explanation-is harder than making antibacterial medicines is that viruses have few biochemical mechanisms of their own. They enter our cells and use our machinery for their life processes. This means that there are relatively few virus-specific targets to aim at.

Q.4) The nitrogenous base Purine occurring in RNA is
a) Cytosine
b) Uracil
c) Guanine
d) Thymine

Ans-[C]
Explanation-There are total 5 Nitrogenous bases occurring in DNA and RNA. Two are purines and three are Pyrimidines. Purines are Adenine and Guanine and Pyrimidines are Cytosine, Uracil and Thymine. In DNA we have, Adenine, Thymine, Guanine and Cytosine. In RNA, we have Adenine Uracil Guanine and Cytosine.

Q.5) Which pair of diseases are caused by Virus?
a) Tetanus and Typhoid
b) Syphilis and AIDS
c) Measles and rabies
d) Sleeping sickness and whooping cough

Ans-[C]
Explanation- The rabies virus is a neurotropic virus that causes rabies in humans and animals.Rabies transmission can occur through the saliva of animals and less commonly through contact with human saliva. Measles virus (MeV) is a single-stranded, negative-sense, enveloped (non-segmented) RNA virus of the genus Morbillivirus within the family Paramyxoviridae.

Whooping cough (pertussis) is an infection of the respiratory system caused by the bacterium Bordetella pertussis.

African trypanosomiasis or sleeping sickness is a parasitic disease of humans and other animals. It is caused by protozoa of the species Trypanosoma brucei.

Syphilis is a sexually transmitted infection caused by the bacterium Treponema pallidum subspecies pallidum.

Human immunodeficiency virus (HIV) is the virus that causes AIDS.

The causative agent of tetanus disease is Clostridium tetani, an anaerobic spore-forming bacterium, whose natural habitat is soil, dust, and intestinal tracts of various animals.

Typhoid fever is an acute illness associated with fever caused by the Salmonella typhi bacteria.

Q.6) Hypersensitivity is related to
a) Aberrant functioning of the immune system
b) Increase in ambient temperature
c) Age of individual
d) Food habits

Ans – [A]
Explanation – Hypersensitivity (also called hypersensitivity reaction or intolerance) is a set of undesirable reactions produced by the normal immune system, including allergies and autoimmunity. These reactions may be damaging, uncomfortable, or occasionally fatal.

Q.7) Influenza virus has
a) DNA
b) RNA
c) DNA and RNA
d) Only proteins and no nucleic acid

Ans-[B]
Explanation-An RNA virus is a virus that has RNA (ribonucleic acid) as its genetic material.This nucleic acid is usually single-stranded RNA but may be double-stranded RNA. Notable human diseases caused by RNA viruses include Ebola hemorrhoragic fever, SARS, influenza,hepatitis C, West Nile fever, polio, and measles.

Q.8) Energy needed to Ionize an atom is greatest for
a) Alkali metals
b) Rare earth metals
c) Noble gases
d) Transition elements

Ans-[C]
Explanation-Noble gases are very stable as their electronic configuration is complete and that’s why it will require lot of energy to ionize an atom.

Q.9) Photodynamic theory is related with the
a) Polaroid photography
b) Cancer treatment
c) Measurement of high speed
d) Growth of plants

Ans-[B]
Explanation-You can read about it in detail here