Biology - Online Test
Q1. Greatest biological problems faced by human being is
Answer : Option B
Explaination / Solution:
The population is growing very fastly all over the world. Increased population demands more and more natural resources. Population explosion is the greatest biological problem faced by human beings world over.
Q2. In which type of solution, the living cell is placed in figure given below
Answer : Option D
Explaination / Solution:
If the external solution is more concentrated, it is hypertonic. Cells shrink in hypertonic.
Q3. Antibodies are formed by
Answer : Option D
Explaination / Solution:
Antibodies are formed against any foreign body entering the body. It is formed by plasma cell, globulins that develop resistance against particular type of disease.
Q4. Which among the following is not included in the three domains system?
Answer : Option A
Explaination / Solution:
The three domain system includes Archaebacteria, Eubacteria and Bacteria domain.
Q5. Embryonal axis has the radicle and root cap enclosed in an undifferentiated sheath is known as
Answer : Option B
Explaination / Solution:
In monocotyledonous seeds embryonal axis has undifferentiated sheath that covers radicle and root cap is called coleorhiza.
Q6. “In Competition, the superior competitor eliminates the inferior one”, this statement is called:
Answer : Option B
Explaination / Solution:
In competition, superior competitor eliminates the inferior one. This statement is called Gause’s competitive exclusion principle. Two closely related competing for same resources cannot co-exist indefinitely and inferior will be eliminated.
Q7. Mineral absorption into the plant is always against the concentration gradient and use ATP as source of energy, it is an/ a
Answer : Option D
Explaination / Solution:
Mineral absorption into the plant is always against the concentration gradient and use ATP molecules as source of energy is an active process. As concentration of minerals are always higher in cell than soil.
Q8. Which layer of alimentary canal forms crypts in between the base of villi?
Answer : Option C
Explaination / Solution:
Mucosa forms gastric glands in the stomach and crypts in between the bases of villi in the intestine (crypts of Lieberkuhn).
Q9. AIDS day is
Answer : Option B
Explaination / Solution:
World AIDS Day, designated on 1 December every year since 1988, is dedicated to raising awareness of the AIDS pandemic caused by the spread of HIV infection, and mourning those who have died of the disease.
Q10. The space within cochlea called scala media is filled with
Answer : Option B
Explaination / Solution:
Cochlear duct or scala media has endolymph and high potassium ion concentration that the stereocilia of the hair cells protrude into helicotrema.
