Zoology - Online Test
Q1. Which bacteria help in oxidising inorganic substances?
Answer : Option C
Explaination / Solution:
Chemosynthetic autotrophic bacteria oxidise various inorganic substances such as nitrates, nitrites and ammonia and use the released energy for their ATP production. They play a great role in recycling nutrients like nitrogen, phosphorous, iron and sulphur.
Q2. An age pyramid showing declining population is
Answer : Option A
Explaination / Solution:
Age pyramids having declining population is referred as contracting pyramid or orion pyramids or Urn pyramids. This kind of pyramids is formed by population having more old aged population than young age population.
Q3. The arrows represent :[upward to downward]
Answer : Option C
Explaination / Solution:
The figure shows the muscular sac called the gall bladder. The duct of gall bladder (cystic duct) along with the hepatic duct from the liver forms the common bile duct.
Q4. Which of the following provides physiological barrier as innate immunity?
Answer : Option B
Explaination / Solution:
Physiological barrier is a kind of innate immunity which prevents microbial growth in the body that causes infection. Acid in stomach kill the microbes that enters the alimentary canal along with food.
Q5. In the following identify from up to down :
(i)&(ii)
(iii) & (iv)
(i)&(ii)
(iii) & (iv)
Answer : Option B
Explaination / Solution:
The reflex pathway comprises at least one afferent neuron (receptor) and one efferent (effectoror excitor) neuron appropriately arranged in a series. The (iii) and (iv) shows gray and white matter.
Q6. Which does not occur in cell membrane?
Answer : Option D
Explaination / Solution:
Cell membrane consists of phospholipids and protiens. Some cells also contain praline and cholesterol but glycolipid is not present in cell membrane.
Q7. Copying of DNA to make more DNA copies is called DNA replication. Replication occurs by method of
Answer : Option A
Explaination / Solution:
In semiconservative replication, when the double stranded DNA helix is replicated, each of the two new double-stranded DNA helices consisted of one strand from the original helix and one newly synthesized. It has been called "the most beautiful experiment in biology.
Semi-conservative replication of DNA was proved by the Meselson and Stahl in 1958.
Q8. Correct decreasing order for rate of primary productivity on land will be
Answer : Option B
Explaination / Solution:
Primary productivity is maximum in tropical rain forests due to availability of sufficient food and water followed by temperate forests. Savannah grasslands have comparatively less productivity and arid regions have limited biotic component and water.
Q9. The gaseous exchange portion of the human respiratory tract include/s :
Answer : Option D
Explaination / Solution:
Alveolar ducts are tiny ducts that connect the respiratory bronchioles to alveolar sacs, each of which contains a collection of alveoli (small mucus-lined pouches made of flattened epithelial cells). They are tiny end ducts of the branching airways that fill the lungs.
Q10. In which crops is the method of mass selection applied
Answer : Option B
Explaination / Solution:
In cross pollinated plants, the newly developed plants have variation and some plant have new traits. Mass selection method is used to select better variety of plants from large number of variant.
