Biology - Online Test
Q1. By studying analogous structures we look for
Answer : Option B
Explaination / Solution:
In evolutionary biology, the term analogous structures pertain to the various structures in different species having the same function but have evolved separately, thus do not share common ancestor.
Examples of analogous structures are as follows: wings of insects and birds used for flying
Q2. In angiosperms vascular tissue develop from
Answer : Option D
Explaination / Solution:
In angiosperms vascular tissue develop from plerome. Plerome form the central core of the primary meristem of a plant or plant part.
Q3. 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.
Q4. 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.
Q5. Water hyacinth is called as terror of Bengal due to
Answer : Option C
Explaination / Solution:
Water hyacinth is water weeds which grows very fast and covers the whole ponds in few days. Weeds absorb oxygen from the water and make it oxygen deficient that kills the fish in ponds along with other aquatic organisms.
Q6. 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.
Q7. 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.
Q8. An antibody is a
Answer : Option C
Explaination / Solution:
An antibody (Ab), also known as an immunoglobulin (Ig), is a large, Y-shaped protein produced mainly by plasma cells that is used by the immune system to neutralize pathogens such as bacteria and viruses.
The antibody recognizes a unique molecule of the harmful agent, called an antigen, via the Fab's variable region.
Q9. Histamine is secreted by
Answer : Option D
Explaination / Solution:
Histamine is responsible for allergic reaction in the body in response to allergens. It is released from mast cell in response to infection or entry of foreign body.
Q10. 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.
