Biology - Online Test
Q1. In human genome project, which chromosome was sequenced at last?
Answer : Option B
Explaination / Solution:
Chromosome 1 is the final one to be mapped out in Human Genome Project. The chromosome carries an estimated 3,141 genes that manufacture proteins, making it one of the most gene-rich chromosomes.
Chromosome 1 is the largest human chromosome, containing about 8% of the entire genome. That's six times longer than its smallest sibling, chromosome 21. Work on this monster started a couple of years after researchers cracked into some of the other chromosomes. It was completed on may 2006.
Q2. Testosterone is secreted by
Answer : Option D
Explaination / Solution:
Testosterone hormone help in release of sperm from testis. This hormone is released by leydig cells present in between seminiferous tubules of testis.
Q3. Phenomenon of “Industrial melanism” demonstrates
Answer : Option C
Explaination / Solution:
The organism surviving in industrial area having polluted soil, air and water undergo changes in skin colour and other traits to adjust in given surroundings. This is a type of natural selection.
Q4. Surgical method of contraception
Answer : Option A
Explaination / Solution:
In surgical method fallopian tubes of female and vas deference of male is cut and tide to prevents insemination and ovulation.
Q5. The international rice genome sequencing project begin in
Answer : Option B
Explaination / Solution:
The International Rice Genome Sequencing Project (IRGSP) began in September 1997, at a workshop held in conjunction with the International Symposium on Plant Molecular Biology in Singapore. Scientists from many nations attended the workshop and agreed to an international collaboration to sequence the rice genome.
Q6. Menstrual cycle is repeated at an average interval of
Answer : Option C
Explaination / Solution:
In human female menstrual cycle is repeated at the interval of 28/29 days from menarche to menopause. Menstrual cycle gets stopped during pregnancy.
Q7. In nature, the process by which different organisms evolve similar traits is called
Answer : Option C
Explaination / Solution:
convergent evolution is the process whereby organisms not closely related (not monophyletic), independently evolve similar traits as a result of having to adapt to similar environments or ecological niches.
Analogous organs are example of convergent evolution.
Q8. The average number of children which an average couple has or would have during their life time is called as
Answer : Option B
Explaination / Solution:
Total fertility rate is the average number of children which an average couple has or would have during their life time. It is different form reproductive potential of a healthy female.
Q9. Autoradiogram of VNTR probe gives many band of different size. It differ from individual to individual except
Answer : Option B
Explaination / Solution:
Autoradiogram of VNTR probe gives many band of different size. It differs from individual to individual except monozygotic twins or identical twins Because MZ twins share the same genetic makeup (DNA) because they are formed from a single zygote (fertilized egg).
Q10. What happen during fertilisation after all the sperm reach close to ovum?
Answer : Option A
Explaination / Solution:
Millions of sperms are released during insemination that reaches to ovum for fertilisation. Only one sperm enter the ovum by penetrating the zona pellucida layer of ovum using the enzyme present in its acrosome.
