List of practice Questions

How do methanogens help in producing biogas ?
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 ?
Why is it essential to have ‘selectable marker’ in a cloning vector ?
Explain Gause’s competitive exclusion principle.
How did Hershey and Chase differentiate between DNA and protein in their experiment while proving that DNA is the genetic material ?
Discuss the nature of genetic code.
Darwin observed a variety of beaks in small black birds inhabiting Galapagos Islands. Explain what conclusions did he draw and how ?
Write any two points of difference between grazing food-chain and detritus food-chain.
What do you mean by ‘Rivet Popper’ hypothesis ?
What is meant by emasculation ? How is it useful in plant breeding programme ?
Draw labelled diagram for the structure of human sperm.
Amniocentesis for sex determination is banned in our country. Is this ban necessary ? Comment.
Briefly describe Zygote Intra Fallopian Transfer (ZIFT) technique practice to help infertile couples.
What is incomplete dominance ? Give an example.
Expand GEAC. What is the responsibility of GEAC, set up by the Indian Government.
Lactational amenorrhea and coitus interruptus are __________ methods of birth control.
The ability of malignant tumors to spread to distant sites in the body through the blood is called __________.
The introduction of alien species usually enhances biodiversity by adding stability to native ecosystems.
Antibiotics are chemical substances produced by some microbes that can kill or inhibit disease-causing microbes.
Thymus increases in size with age and reaches its maximum size during puberty.
Simple shake flasks are more effective than stirred-tank bioreactors for producing large quantities of recombinant proteins.
X and Y are two birth control methods, commonly called sterilization methods. X and Y are generally advised for the male and female partner respectively to prevent pregnancies. These techniques are highly effective. Identify X and Y.
A woman with blood group ‘AB’ marries a man with blood group “O”. Which of the following statements is true about the possibilities of inheritance of the blood groups?
The process of copying genetic information from one strand of DNA into RNA is termed as :
The following are some of the well-known fossils in the evolution of modern man :
$\bullet$ Homo habilis
$\bullet$ Homo erectus
$\bullet$ Homo sapiens
$\bullet$ Australopithecus
The correct sequence of their origin is :