Zoology - Online Test
Q1. Semi-conservative replication of DNA was first demonstrated in
Answer : Option A
Explaination / Solution:
Semi-conservative replication of DNA was first demonstrated in bacterium Escherichia coli as it contain single chromosome within the cell without nuclear membrane.
Q2. Which of the following is a not a green house gas
Answer : Option D
Explaination / Solution:
Green house gas is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect.
Many greenhouse gases occur naturally in the atmosphere, such as carbon dioxide, methane, water vapor, and nitrous oxide, while others are synthetic. Those that are man-made include the chlorofluorocarbons (CFCs), hydrofluorocarbons (HFCs) and Perfluorocarbons (PFCs), as well as sulfur hexafluoride (SF6). Oxygen is not a green house gas.
Q3. Cell growth results in disturbing the ratio between
Answer : Option B
Explaination / Solution:
Cell growth results in disturbing the ratio between the nucleus and the cytoplasm. It therefore becomes essential for the cell to divide to restore the nucleo-cytoplasmic ratio. Cell becomes stable when N/C ratio is 1.
Q4. PCR was discovered by
Answer : Option D
Explaination / Solution:
Polymerase chain reaction (PCR) was discovered by Kary Mullis. PCR technique is used to amplify the DNA segments to obtain large number of identical copies.
Q5. Which of the following examples of variation is not important from an evolutionary standpoint?
Answer : Option D
Explaination / Solution:
Biological evolution refers to the cumulative changes that occur in a population over time. Non-genetic changes that occur during an organism's life span, such as increases in muscle mass due to exercise and diet,differences due to health, age or accident that have no affect on an individual's ability to survive and reproduce cannot be passed on to the next generation and are not examples of evolution.
Q6. Which one is less general in characteristic as compared to genus
Answer : Option A
Explaination / Solution:
Division is the highest category of hierarchy which contain organisms having only a few common characters. On the other hand, species belongs to lowest level so, the organisms have more common characters.
Q7. The first order consumers are called:
Answer : Option B
Explaination / Solution:
Plants and algae make their own food and are called primary producers. Herbivores eat plants and are called primary consumers.
Q8. DNA is denatured to produce single strand by
Answer : Option C
Explaination / Solution:
Deoxyribose nucleic acid is denatured to produce single stranded by using alkaline solution. DNA is acidic in nature, in alkaline solution the hydrogen bonds between the nitrogenous bases is broken to separate two strands.
Q9. Human population growth is
Answer : Option A
Explaination / Solution:
Human population growth is exponential growth which gets doubled every time. The newly produced individual also participates in population increase after attaining puberty.
Q10. How many times do nymphs moult to reach the adult form of cockroach?
Answer : Option D
Explaination / Solution:
When the ootheca hatches, tiny nymph come out. It grows by undergoing moulting about 13 times to reach the adult form.
