Biology - Online Test
Q1. Dead parts of plants and animals that fall on the earth surface constitute
Answer : Option D
Explaination / Solution:
Dead parts of plants and animals that fall on earth surface constitute litter. These litter get decomposed due to action of microbes to form humus and release nutrients in soil.
Q2.
During vigorous exercise :
i. lactic acid accumulates in muscle cells to meet its energy needs immediately.
ii. lactic acid is formed by anaerobic respiration hence oxygen consumption by muscles is reduced.
iii. This reduction in oxygen consumption is called oxygen debt of muscle.
Answer : Option D
Explaination / Solution:
During vigorous exercise, lactic acid accumulates in muscles cells to meet the energy requirement of muscle cell. Lactic acid is formed due to insufficient availability of oxygen.
Q3. Gene transfer in biotechnology can be done by
Answer : Option C
Explaination / Solution:
Gene transfer in biotechnology can be done by number of methods. Microinjection is the use of a glass micropipette to inject a liquid substance at a microscopic or borderline macroscopic level. The target is often a living cell but may also include intercellular space.
Microinjection is one of the best methods to transfer desired gene into suitable host.
Q4. Which of the following is mechanical barrier used for birth control
Answer : Option C
Explaination / Solution:
Diaphragm is mechanical barrier used for birth control. It is made up of rubber and prevents meeting of sperm and ovum.
Q5. Mature erythrocytes cannot utilise glucose because they lack
Answer : Option D
Explaination / Solution:
Mature erythrocytes or red blood corpuscles cannot utilize glucose because these cells lack mitochondria as well as nucleus. Though glycolysis or glucose breakdown occurs in the cytoplasm, the final breakdown of pyruvate takes place inside mitochondria. Also the electron transport chain is located inside mitochondria. Hence presence of mitochondria is essential for a cell to utilize glucose and release energy.
Q6. The outer protein covering of virus is
Answer : Option C
Explaination / Solution:
A capsid is the protein shell of a virus. It consists of several oligomeric structural subunits made of protein called protomers. The capsid encloses the genetic material of the virus.
Q7. The pathway of water passes from root hairs to xylem through the walls of intervening cells without crossing any membrane or cytoplasm is called
Answer : Option B
Explaination / Solution:
The apoplast is the system of adjacent cell walls that is continuous throughout the plant, except at the casparian strips of the endodermis in the roots.
Q8. In which of the following plants fruit contain larger number of seed
Answer : Option C
Explaination / Solution:
The number of ovule present in ovary determine the number of seeds produced inside the fruit. Mango and neem produce single seed in each fruit. Lemon contain a number of seeds but orchid contain many small size seeds.
Q9. Success of an organism in nature can be determined by
Answer : Option D
Explaination / Solution:
Success of an organism in nature can be determined by measuring population size and biomass of the organism. An organism having large number of species is more successful than those with lesser numbers.
Q10. Main function of Nickel (Ni2+) in leaves and root is
Answer : Option B
Explaination / Solution:
Main function of Nickel ions in leaves and root is metabolism of urea and ureides to form amino acids and protein in plant body.
