Biology - Online Test
Q1. In the case of peppered moth (Bistonbetularia) the black-coloured form became dominant over the light-coloured form in England during industrial revolution. This is an example of
Answer : Option C
Explaination / Solution:
In England, the places where industrialization is more, peppered moth which was originally white coloured have become dark coloured as dominant due inheritance of darker color character acquired due to the darker environment.
Q2. Now a day, there is less childless couple. This is due to
Answer : Option A
Explaination / Solution:
Some couples are not able to reproduce normally due to malfunctioning of reproductive system. Assisted reproductive technologies can assist them in different way depending upon the need of couple such as IVF, GIFT, ICSI,IUI etc.
Q3. Human genome project can leads to revolutionary new ways to
Answer : Option A
Explaination / Solution:
The Human Genome Project (HGP) is an international thirteen-year project that began on October 1990. It is important because it uses information from DNA to develop new ways to diagnose, treat, cure, or even prevent the thousands of diseases that afflict humankind.
Q4. A Human female reaches menopause around the age of
Answer : Option A
Explaination / Solution:
The stoppage of menstrual cycle in human female is called menopause. This indicates the end of reproductive phase of female at the age of about 50 years.
Q5. Links between organisms that show branching pattern of evolutionary relationships are shown by
Answer : Option B
Explaination / Solution:
Phylogenetic trees shows links between organisms that show branching pattern of evolutionary relationship. In this pattern, the organism that evolves earlier is shown below and further sub branching represent newly evolved organisms.
Q6. High increase in human population is due to
Answer : Option C
Explaination / Solution:
High increase in human population is due to availability of better medical facilities to increase IMR and decrease MMR.
Q7. In human genome project, commonly used host were bacteria and yeast and their vectors are called as
Answer : Option B
Explaination / Solution:
YAC (Yeast artificial chromosome): It is a vector used to clone DNA fragments larger than 100 kb and up to 3000 kb. The major advantage of using artificial chromosomes such as YACs is that it can carry much larger DNA fragments than ordinary plasmids.
BAC (Bacterial artificial chromosome: It is an artificially constructed vector containing origin of replication & selectable marker for identification. It is capable of carrying large DNA fragments and can replicate easily inside a bacterial cell.
These vectors are used in human genome project for mapping or sequencing of genomes to be studied.
Q8. Which one is the most likely reason of not occurring regular menstrual cycle
Answer : Option A
Explaination / Solution:
Menstrual cycles get stopped during pregnancy. Sometimes it becomes irregular due to stress and other hormonal activities of the body.
Q9. Which of the following is not a factor that affects Hardy-Weinberg equilibrium?
Answer : Option B
Explaination / Solution:
Hardy-Weinberg equilibrium cannot be disturbed by vegetative propagation as the all new offspring are clone of each other having same gene. Migration, genetic drift, mutation and natural selection affect the equilibrium of alleles in a population.
Q10. Inability to conceive or produce children even after two years of unprotected sexual co-habitation is called
Answer : Option C
Explaination / Solution:
The inability to conceive even after two years of unprotected sexual co-habitation is called infertility. This may be due to not functioning of male or female reproductive system properly.
