Biology - Online Test
Q1. Phage is a
Answer : Option A
Explaination / Solution:
Phage is a virus that infects bacteria. Such viruses transfer their genetic materials into host bacteria and using the bacterial machinery increase in number and multiply rapidly to kill host cells.
Q2. The physiological unit of a kidney is :
Answer : Option C
Explaination / Solution:
Nephrons are the physical unit or functional unit of kidney. Millions of nephrons are present in each kidney but physiological unit of kidney is urinigerous tubule.
Q3. Who performed the famous experiment to prove origin of life?
Answer : Option A
Explaination / Solution:
The famous experiment to prove the origin of life from inorganic substance was performed by Urey and Miller in 1953 by creating similar condition in laboratory as earth would be at the time of origin of life.
Q4. The meristems which occur at the tips of roots and shoots and produce primary tissues are called
Answer : Option B
Explaination / Solution:
Apical meristem is found at the apices, or tips of the plant, both the tip of the shoot and the root, and is a region of actively dividing cells. The definition is easy to remember when you break it down. An apex is the tip, the very end, of something.
Q5. The differentiated cells have lost the capacity to divide can regain the capacity of division under certain conditions called as
Answer : Option B
Explaination / Solution:
The living differentiated cells that have lost the capacity to divide can regain the capacity of division under certain conditions. This phenomenon is termed as dedifferentiation.
Q6. The scientific name of organisms should be written as
Answer : Option C
Explaination / Solution:
Mangiferaindica. Here, Mangifera is a generic name while indica is a specific name.hence, the correct option is Genus species.
Q7. A functional G-Actin molecule in its free state is bound to :
Answer : Option A
Explaination / Solution:
A functional G-actin molecule in its free state is bound to magnesium ion and ATP. G-actin molecule forms a bridge between the muscle fibres for sliding.
Q8. RNAi is used to produce resistance against the nematode
Answer : Option D
Explaination / Solution:
RNA interference (RNAi) is present in all eukaryotic organisms as a method of cellular defense.
When Meloidogyne incognita (parasite) consumes cells with RNAi gene, parasite cannot survive and this prevents infestation. The introduced RNAi gene DNA forms both sense and anti-sense RNA. Two strands being complementary to each other bend and form ds RNA, leading to RNAi. Thus, the mRNA of nematode is silenced and the parasite cannot survive there.
Q9. Indian population is
Answer : Option D
Explaination / Solution:
The Indian population is young population as large number of population belongs to age group of 35 to 50 years.
Q10. The component that is essential to perform all physiological activities of the plant is
Answer : Option C
Explaination / Solution:
Water is essential for all physiological activities of the plant and plays avery important role in all living organisms. It provides the medium in which most substances are dissolved.
