List of top Biology Questions

State and explain Mendel’s Law of Independent Assortment with reference to a dihybrid cross involving pea plant. Consider the traits of seed shape (round vs. wrinkled) and seed colour (yellow vs. green).
What will be the fate of polar nuclei after fertilisation ?
How does the drug affect the human body ?
Which part is responsible for guiding the pollen tube into synergid ?
Which of the following structures is/are present at micropylar end ?
What are Cry proteins ? How have biotechnologists exploited these proteins to benefit farmers ?
Name the drug obtained from the latex of this plant.
Identify the plant shown in the diagram.
A recombinant DNA is formed when sticky ends of vector DNA and foreign DNA Join. Explain how the sticky ends are formed and get jointed.
What does this diagram represent ?
Why is it essential to have ‘selectable marker’ in a cloning vector ?
DNA being hydrophilic cannot pass through the cell membrane of a host cell. Explain how the host cell is made 'competent' to take up the recombinant DNA ?
Darwin observed a variety of beaks in small black birds inhabiting Galapagos Islands. Explain what conclusions did he draw and how ?
Discuss the nature of genetic code.
Are the thorn of Bougainvillea and tendril of Cucurbita homologous or analogous ? What type of evolution has brought such a similarity in them ?
How do methanogens help in producing biogas ?
How did Hershey and Chase differentiate between DNA and protein in their experiment while proving that DNA is the genetic material ?
Explain Gause’s competitive exclusion principle.
Draw a labelled diagram showing the structure of an antibody molecule.
Amniocentesis for sex determination is banned in our country. Is this ban necessary ? Comment.
Draw labelled diagram for the structure of human sperm.
What is meant by emasculation ? How is it useful in plant breeding programme ?
Briefly describe Zygote Intra Fallopian Transfer (ZIFT) technique practice to help infertile couples.
What is incomplete dominance ? Give an example.
Write any two points of difference between grazing food-chain and detritus food-chain.