Biology - Online Test
Q1. The process in which heritable variations enabling better survival are enabled to reproduce and leave greater number of progeny is called
Answer : Option B
Explaination / Solution:
Natural selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin, and it is now regarded as be the main process that brings about evolution.
Q2. Exponential growth is maximum in
Answer : Option D
Explaination / Solution:
Exponential growth is maximum in tissue culture because each cell divides continuously to form callus of cells. Sufficient amount of nutrient is also available in culture media.
Q3. Rice genome projects includes
a. Fingerprinting of HindIII and Eco RI.
b. Assembly of the fingerprinted BACs into contigs.
a. Fingerprinting of HindIII and Eco RI.
b. Assembly of the fingerprinted BACs into contigs.
Answer : Option A
Explaination / Solution:
The Rice genome projects involves fingerprinting of HindIII and EcoRI BAC libraries, assembling the fingerprinted BACs into contigs, anchoring of the BACs onto the physical map with DNA gel restriction fragment length polymorphism (RFLP) and BAC end sequence analysis, and connecting and extending of contigs by chromosome walking.
Q4. Physical and chemical changes in the egg cortex which occur after the sperm entry into the egg is called
Answer : Option B
Explaination / Solution:
After the entry of sperm into the egg the zona pellucida layer undergoes physical changes that prevent the entry of addition sperm. This reaction between zona pellucida is called cortical reaction.
Q5.
Assertion- Evolution is a continuous process that takes millions of years for speciation.
Reason- During evolution small variation accumulates guided by natural selection that leads to speciation.
Answer : Option D
Explaination / Solution:
Evolution is a slow and continuous process that takes long time to form a new species. Variation due to mutation, genetic drift, geographical isolation leads to speciation.
Q6. Which of the following is not a cause of male sterility?
Answer : Option B
Explaination / Solution:
Male sterility is mainly due to less number of sperm count or sperms motility is very less to fertile the ovum. The first case is called oligospermia and second case is called azoospermia. Tubal infertility is present in female.
Q7.
Genetic and physical map of genome was generated using information on
a. Polymorphism of restriction endonuclease recognition sites.
b. Repetitive DNA sequence called microsatellites.
Answer : Option C
Explaination / Solution:
Genetic and physical map of genome was generated using information on polymorphism of restriction endonuclease recognition sites and repetitive DNA sequence called microsatellites.
Q8. Which one is correctly matched pair
Answer : Option B
Explaination / Solution:
Transfer of male gamete into female genital tract takes place during sexual intercourse, which is also called as coitus. Clitoris is the part of female reproductive system, colostrum is first milk secreted from mammary gland.
Q9. Genetic drift
Answer : Option B
Explaination / Solution:
Genetic drift is a mechanism of evolution in which allele frequencies of a population change randomly over generations due to chance (sampling error). Genetic drift occurs in all populations of non-infinite size, but its effects are strongest in small populations.
Q10. Which of the following is not a cause of male sterility?
Answer : Option C
Explaination / Solution:
Male sterility is mainly due to less number of sperm count or sperms motility is very less to fertile the ovum. The first case is called oligospermia and second case is called azoospermia. Tubal infertility is present in female.
