Zoology - Online Test
Q1. The primary and secondary immune response are carried out with the help of two special types of lymphocytes present in our blood called
Answer : Option A
Explaination / Solution:
T cells (thymus cells) and B cells (bone marrow- or bursa-derived cells) are the major cellular components of the adaptive immune response. T cells are involved in cell-mediated immunity, whereas B cells are primarily responsible for humoral immunity (relating to antibodies).
Q2. A region on retina of human eye which is free from rods and cones is :
Answer : Option A
Explaination / Solution:
The optic nerves leave the eye and the retinal blood vessels enter it at a point medial to and slightly above the posterior pole of the eye ball. Photoreceptor cells are not present in that region and hence it is called the blind spot.
Q3. Lipid molecules of plasma membrane occur
Answer : Option A
Explaination / Solution:
The lipid molecules occur in chains. In plasma membrane two molecular chains of lipids remain parallel to each other.
Q4. HIV is classified as a retrovirus because its genetic information is carried in
Answer : Option C
Explaination / Solution:
Retrovirus is a type of virus that uses RNA as its genetic material. After infecting a cell, a retrovirus uses an enzyme called reverse transcriptase to convert its RNA into DNA.
The retrovirus then integrates its viral DNA into the DNA of the host cell, which allows the retrovirus to replicate. HIV, the virus that causes AIDS, is a retrovirus.
Q5. The more fundamental type of ecological pyramid showing the quantitative relationships of the standing crops will be
Answer : Option C
Explaination / Solution:
The pyramid of biomass is more fundamental, they represent the quantitative relationships of the standing crops.
In this pyramid there is a gradual decrease in the biomass from the producers to the higher trophic levels. The biomass here the net organisms collected from each feeding level and are then dried and weighed.
This dry weight is the biomass and it represents the amount of energy available in the form of organic matter of the organisms. In this pyramid the net dry weight is plotted to that of the producers, herbivores, carnivores, etc. More the number of crop plants higher the biomass.
Q6. Air breathing animals lose a large amount of precious water from their respiratory surface through :
Answer : Option C
Explaination / Solution:
Water is released in atmosphere along with expired air during respiratory cycle. Air breathing animals lose a large amount of precious water from their respiratory surface through evaporation.
Q7. "Jaya" and "Ratna" developed for green revolution in India are the varieties of
Answer : Option D
Explaination / Solution:
Jaya and Ratna are varieties of maize developed by Indian council of agricultural research. These varieties are high yielding and resistance to disease.
Q8. Endemics of western Ghats include
Answer : Option C
Explaination / Solution:
Endemism is the ecological state of a species being unique to a defined geographic location, such as an island, nation, country or other defined zone, or habitat type.
Notable endemics are the Nilgiri leaf monkey and the brown and carmine Beddome's toad of the Western Ghats.
Q9.
Match the following :
| Hormone | Synonym |
| a) Adrenaline | i) birth hormone |
| b) Oxytocin | ii) moulting hormone |
| c) Ecdyson | iii)luteotropic hormone |
| d) Prolactin | iv) fight or flight hormone |
Answer : Option A
Explaination / Solution:
Adrenaline hormone is called fight and flight hormone. Oxytocin is called birth hormone. Ecdyson is called moulting hormone and prolactin is called as luteotropic hormone.
Q10. Which one of the following is a living fossil?
Answer : Option D
Explaination / Solution:
Limulus (the king crab or horse-shoe crab) continues to remain unchanged for past 190 million years. It is therefore, also called living fossil. Excretion occurs through four pairs of coxal glands. Respiration occurs through book gills.
