Zoology - Online Test
Q1. The outer protein covering of virus is
Answer : Option C
Explaination / Solution:
A capsid is the protein shell of a virus. It consists of several oligomeric structural subunits made of protein called protomers. The capsid encloses the genetic material of the virus.
Q2. Success of an organism in nature can be determined by
Answer : Option D
Explaination / Solution:
Success of an organism in nature can be determined by measuring population size and biomass of the organism. An organism having large number of species is more successful than those with lesser numbers.
Q3. Correct sequence of layers in gut wall from inside to outside is :
Answer : Option B
Explaination / Solution:
The wall of alimentary canal is made of four layers performing different functions. The inner most layer is called mucosa followed by submucosa,muscularis and serosa. Theses layers are made of different kind of tissues to perform different function.
Q4. The incubation period of Hepatitis 'B' virus is
Answer : Option C
Explaination / Solution:
Incubation period is the time elapsed between exposure to a pathogenic organism, a chemical, or radiation, and when symptoms and signs are first apparent.
The incubation period of the hepatitis B virus is 75 days on average, but can vary from 30 to 180 days. The virus may be detected within 30 to 60 days after infection and can persist and develop into chronic hepatitis B.
Q5. Mohan lacks one or more type of cone cells in the retina of his eye. So he will suffer from :
Answer : Option B
Explaination / Solution:
Colour perception of human eye is due to presence of cones in their retina. If one of more kinds of cones are missing from retina of eye, the person suffer from genetic disease called colour blindness.
Q6. Middle lamella is mainly composed of
Answer : Option C
Explaination / Solution:
The middle lamella is a layer mainly of calcium pectate which holds or glues the different neighbouring cells together.
Q7. Enzymes called ______ add complementary nucleotides, floating inside the nucleus.
Answer : Option B
Explaination / Solution:
The DNA polymerases are enzymes that create DNA molecules by assembling nucleotides, the building blocks of DNA. These enzymes are essential to DNA replication and usually work in pairs to create two identical DNA strands from one original DNA molecule. It is found floating freely inside the nucleus.
Q8. Habit of Cigarette smoking can lead to :
Answer : Option A
Explaination / Solution:
The habit of Cigarette smoking can lead to coughing, emphysema and loss of cilia lining the respiratory tract. It contain nicotine that breaks the wall of alveoli to reduce respiratory surface.
Q9. The dividing and undifferentiated cells are known as
Answer : Option C
Explaination / Solution:
The differentiated mass of cells is called callus. During tissue culture, callus is formed when small part of plant is kept in nutrient medium. Callus cells divide rapidly.
Q10. As per research reports, due to unchecked human activities our Earth is at present heading towards
Answer : Option B
Explaination / Solution:
An extinction event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the biodiversity on Earth.
Due to unchecked human activities, biologists suspect we’re living through the sixth major mass extinction. Earth has witnessed five, when more than 75% of species disappeared.
Glogal warming, greenhouse effect, deforestation, pollution of atmosphere, water and soil all contributing destruction of earth.
