Biology - Online Test
Q1. The death rate if 8 individuals in a laboratory population of 40 fruit flies died during a particular week will be:
Answer : Option C
Explaination / Solution:
Death rate of a population =
Here death rate =
Hence, death rate of fruit fly died is equal to 0.2.
Q2. Main role of minor elements is to act as
Answer : Option D
Explaination / Solution:
Micronutrients are required in very small quantity. The main role of micronutrients is to act as cofactor of enzyme. Co-factors increase the efficiency of enzymes.
Q3. Absorption of food takes place in stomach as well as intestine but villi are present in intestine only because :
Answer : Option D
Explaination / Solution:
Villi increases the surface area thereby increasing the absorption of food.The villi also contain lymph vessels for absorbing the products of fat-digestion. From the blood stream, the absorbed food is finally delivered to each and every cell of the body. The mucosal walls of the stomach form irregular folds known as rugae.These help in increasing the surface area to volume ratio of the expanding stomach.
Q4. Which one of the following is a matching pair of a drug and its category?
Answer : Option D
Explaination / Solution:
Amphetamines is kind of drug which is used as stimulant. It is a strong CNS stimulant that is used in the treatment of ADHD. Lysergic acid dimethyl amide is not a narcotic and heroin is not a psychotropic agent.
Q5. Find out the mismatched pair :
Answer : Option D
Explaination / Solution:
Different parts of human brain have specializedarea for different receptors. Visual area is located in occipital lobe. General sensory area are located in parietal lobe, smell area is located in frontal area. Speech area is not located in parietal lobe.
Q6. Male and female gametophytes do not have free independent existence in
Answer : Option A
Explaination / Solution:
Unlike bryophytes and pteridophytes , in gymnosperms ( Cedrus )the male and the female gametophytes do not have an independent free-living existence.
Q7. Which one is present nearest to plasmamembrane?
Answer : Option A
Explaination / Solution:
The cell wall of a young plant cell, the primary wallis capable of growth, which gradually diminishes as the cell matures and the secondary wall is formed on the inner (towards membrane) side of the cell.
Q8. Central dogma of protein synthesis is
Answer : Option A
Explaination / Solution:
Central dogma of protein synthesis consists of transcription and translation. In transcription process, DNA is changed into mRNA and in translation step m-RNA produce specific protein.
Q9. Electrons from exited chlorophyll molecules of photosystem II are accepted first by
Answer : Option C
Explaination / Solution:
During potophosphorylation, electron released during photolysis of water passes through electron transport chain. The electron from exited chlorophyll molecules of Photosystem II are accepted first by quinine.
Q10. The regulatory centres for respiration are located in :
Answer : Option D
Explaination / Solution:
A specialised centre present in the medulla region of the brain called respiratory rhythm centre is primarily responsible for this regulation. In the pons region of the brain called pneumotaxic centre can moderate the functions of the respiratory rhythm centre.
