Biology - Online Test
Q1. Study of tissues is called
Answer : Option C
Explaination / Solution:
Study of organisms at tissues level is called histology.It includes study of tissue structure, origin, location and function.
Q2. Which among the following is photosynthetic as well as saprophytic?
Answer : Option C
Explaination / Solution:
Euglena is photosynthetic in presence of sunlight and is saprophytic in absence of sunlight.
Q3. Out of the following which is not an example of parasitism?
Answer : Option D
Explaination / Solution:
E.coli in human intestine obtain their food from undigested food remains and do not harm so, it is not an example of parasitism in which one organism is harmed but other is benefited.
Q4. In plant, nitrate is reduced to ammonia state in two steps. In second step electrons are donated by
Answer : Option B
Explaination / Solution:
During ammonification process involve conversion of nitrate into ammonia. This process involves two steps. Second steps require electron that is donated by Ferredoxin.
Q5. What should be filled in to replace question mark in the following sequence :?
Trypsinogen →Trypsin
Answer : Option A
Explaination / Solution:
Trypsinogen is activated by an enzyme, enterokinase, secreted by the intestinal mucosa into active trypsin.
Q6. The growing immunity, after getting the disease free body
Answer : Option A
Explaination / Solution:
When a host is exposed to antigens, antibodies are produced in the host body. This type of immunity is called active immunity. Hence, growing immunity after getting the disease free body is active acquired immunity.
Q7.
In Pavlov’s conditioned reflex experiment find the correct matches :
| Column A | Column B |
| a) conditioned stimulus | i) salivation in response to food |
| b) conditioned response | ii) food itself |
| c) unconditioned stimulus | iii)sound of the bell |
| d) unconditioned response | iv) salivation in response to bell |
Answer : Option C
Explaination / Solution:
There are different kinds of stimulus that is received by different receptors in our body. Hearing of sound of bell is conditioned stimulus and salivation in response to bell is conditioned response. Food itself is conditioned stimulus and salivation in response to food is unconditioned response.
Q8. Which of the following is responsible for peat formation?
Answer : Option D
Explaination / Solution:
Sphagnum mosses not only dominate large areas of the boreal peatlands, but they have also formed these habitats by their growth and production of decay-resistant litter. As they invade, they can quickly transform a high-pH fen with little peat accumulation to a bog where large amounts of carbon is stored. They are also responsible for the many types of surface patterns observed in peatlands. Their ability to shape and transform mires can to a large extent be understood from the peculiar anatomy and biochemistry, a fact which makes the links between species’ traits and ecosystem functions in peatlands very strong.
Q9. Arrangement of ciliary microtubules is
Answer : Option A
Explaination / Solution:
Cilia present in prokaryotic organisms consist of microtubules. These microtubules are arranged in 9+2 order in which 2 forms the center and 9 are arranged at periphery.
Q10. In the DNA molecule:
Answer : Option C
Explaination / Solution:
In the DNA molecule, there are two strands which run antiparallel one in the 5′→3′direction and other in the 3′→5′.
Two strands are combined by Hydrogen bonds between nitrogenous bases of complementary strands.
