Zoology - Online Test
Q1. 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.
Q2. 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.
Q3. 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.
Q4. 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.
Q5. 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.
Q6. 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.
Q7. In rice genome project large insert genomic libraries used as the primary sequencing templates are constructed in
Answer : Option A
Explaination / Solution:
Rice genome sequencing is being conducted along the same lines as numerous other large-scale genome sequencing projects.
Large insert genomic libraries, used as the primary sequencing templates, are constructed in bacterial artificial chromosomes (BACs) or P1-derived artificial chromosomes (PACs).
Sequencing of the rice genome is being performed mainly from genomic BAC or PAC libraries created from the Nipponbare variety, which was chosen as the common template throughout the IRGSP.
Q8. The inner cell mass which have potency to give rise all tissue and organs is called
Answer : Option C
Explaination / Solution:
The inner cell mass (embryo) contains certain cells called stem cells that have capability to give rise to all tissues or organ in adult.
Q9. Founder effect is the
Answer : Option C
Explaination / Solution:
The founder effect is the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population.
Sometimes the change in frequency is so different in the new sample of population that they become a different species. The original drifted population becomes founders.
Q10. Amniocentesis is a method to
Answer : Option D
Explaination / Solution:
Amniocentesis is a method to known the chromosome type of the foetus. It is used to detect the genetic disorder of foetus by analyzing chromosome. It is misused to known the sex of foetus.
