CBSE 11TH BIOLOGY - Online Test
Q1. Permanent and irreversible increase in dry weight, size, and mass, volume of cell, organ or organism is called
Answer : Option C
Explaination / Solution:
Growth is defined as a permanent or irreversible increase in dry weight, size, mass or volume of a cell, organ or organism. Growth in living beings is intrinsic or internal.
Q2. The number of species that are known and described is
Answer : Option A
Explaination / Solution:
Each different kind of plant, animal or organism represents a species. The number of species known and described ranges between 1.7-1.8 million. This refers to biodiversity or the number and types of organisms present on earth. Hence, the correct option is 1.7 – 1.8 million.
Q3. Which of the following hormones will stimulate gluconeogenesis?
Answer : Option B
Explaination / Solution:
Glucocorticoids stimulate gluconeogenesis. Similarly, glucagon also stimulates the process of gluconeogenesis which also contributes to hyperglycemia.
Q4. Myoglobin was the first protein to have its three-dimensional structure revealed. Ravi was diagnosed with myoglobin in his bloodstream. This had occurred due to :
Answer : Option C
Explaination / Solution:
Myoglobin is an iron and oxygen binding protein found in the muscle tissue of mammals. Presence of myoglobin in blood stream may be due to muscle injury of Ravi due to accident or sudden jerk.
Q5. Water potential of pure water and its solution are
Answer : Option B
Explaination / Solution:
The water potential of pure water at standard temperatures, which is not under any pressure, is taken to be zero. If some solute is dissolved in pure water, the solution has fewer free water and the concentration of water decreases, reducing its water potential.
Q6. 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.
Q7. 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.
Q8. 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.
Q9. 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.
Q10.
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.
