Zoology - Online Test
Q1.
Look at the following ECGs:
Answer : Option B
Explaination / Solution:
Both electro cardiogram (ECG) represents myocardial infarction in which heart do not receive the sufficient oxygen due to blockage of coronary artery.
Q2. The common nitrogen-fixer in paddy fields is
Answer : Option A
Explaination / Solution:
Nitrogen is obtained by plants either in nitrate or nitrite forms. Some microbes convert atmospheric nitrogen into nitrate and nitrite. The common nitrogen-fixing microbe in paddy field is Azospirillum.
Q3. Soil pollution :
i. can be of two types- positive and negative
ii. soil erosion is an example of positive soil pollution
i. can be of two types- positive and negative
ii. soil erosion is an example of positive soil pollution
Answer : Option D
Explaination / Solution:
Addition of harmful substances in soil is called soil pollution. Soil pollution is of two types positive and negative. Addition of organic wastes increase the productivity so positive. Soil erosion is the removal of top fertile layer of soil that reduce its fertility so it is a negative soil pollution.
Q4. In the metaphase stage, the chromosomes are made up of
Answer : Option A
Explaination / Solution:
At metaphase stage, the chromosome is made up of two sister chromatids formed due to longitudinal splitting of the chromatids, which are held together by the centromere.
Q5. Primers are
Answer : Option A
Explaination / Solution:
Primers are chemically synthesized oligonucleotides that are complementary to the regions of DNA and the enzyme DNA polymerase.
Q6. If in glomerular capillaries, pressure of blood is 75 mm Hg, osmotic pressure of plasma proteins is 30 mm Hg, and hydrostatic pressure of fluid in renal tubule is 25 mm Hg then net force or the filtration pressure will be calculated as :
Answer : Option D
Explaination / Solution:
Net force of filtration pressure is equal to the blood pressure of glomerular capillaries minus sum of the osmotic pressure of plasma and hydrostatic pressure of fluid in renal tubule. So, filtration pressure = 75 – [ 30 + 20 ] mm Hg.
Q7. Lamarck theory of organic evolution is usually known as
Answer : Option B
Explaination / Solution:
Lamarck theory of organic evolution is also known as inheritance of acquired traits. He believed that the character an individual gain in his life time is also passed to next generation.
Q8. Example of interspecific hybrid is
Answer : Option C
Explaination / Solution:
Tigon and liger are produced by hybridization of tow interspecific species. Although hybridization generally takes place between same species.
Q9. Which of the following ecosystem services cost maximum
Answer : Option A
Explaination / Solution:
Soil formation accounts for about 50% of total cost of ecosystem services. Nutrient cycling and recreation accounts for about 10% of all ecosystem services.
Q10.
Match the following :
Animal
a) Sphyrna
b) Pediculus
c) Asterias
d) Metridium
type of skeleton
i) exoskeleton
ii) hydrostatic skeleton
iii) cartilaginous skeleton
iv) endoskeleton
Answer : Option A
Explaination / Solution:
Different kinds of skeleton system is found in different organisms. Sphyma contain cartilaginous skeleton. Pediculus contain exoskeleton. Asterias contain endoskeleton and Metridium contains hydrostatic skeleton.
