List of top Biology Questions

What are Intra-uterine devices (IUDs)? Discuss their mode of action.
What is fertilization? In which part of the human female reproductive system does it occur? Explain, with the help of diagrams, various physical and chemical events of fertilization in humans.
What are the measures one has to take to prevent from contracting STDs?
Name the parasite which causes Malaria. At what stage does it enter the human body? Mention symptoms and two control measures.
Name the causative agent of Amoebiasis. Mention its symptoms and mode of transmission. State any two precautionary measures.
Differentiate between homozygous and heterozygous individuals.
In what way, anaerobic sludge digestion is important in sewage treatments?
If the sequence of the template strand in a transcription unit is written as follws :
5' - ATGCATGCATGCATGC - 3'
what is the sequence of mRNA?
Give the characteristics of genetic code.
(a) Define transcription.
Briefly describe the role of microbes in household food processing.
Briefly describe the Meselson and Stahl's experiment to prove that DNA replication is semi-conservative.
List any four harmful effects caused by alcohol or drug abuse.
How has the bacterium Bacillus thuringiensis helped us in controlling caterpillars of insect pests?
What is Human Genome Project? Why is the Human Genome Project called a Mega project?
Distinguish between innate and acquired immunity.
Define infertility. Explain any one assisted reproductive technology to check the problem of infertility.
What is Amniocentesis? For what purpose, it is used?
A woman carrier for haemophilia marries a normal man. Predict the possible genotypes and phenotypes of the offspring using a Punnett square. Also state percentages.
State and explain Mendel's law of dominance with the help of an example.
What happens to the corpus luteum in human females if the ovum is (a) fertilised (b) not fertilised?
Define codominance. Explain the concept of co-dominance by taking an example of AB blood group in humans.
Sex determination in honey bees is XX-XY type.
What are primary lymphoid organs?
Floral parts are un-wettable in case of hydrophilous flowers.