List of top Biology Questions asked in UP Board XII

Write short notes on any two of the following: ( Red Data Book
Trace the events that would take place in flowers from the time of fall of pollen grain on stigma up to completion of fertilization with the help of diagram.
Describe the Hershey-Chase experiment with labelled diagram. Write the conclusion drawn by the scientists after this experiment.
Write a brief note on the role of lymphoid organs in the immune response. Elaborate the different types of lymphoid organs in the human body with examples.
Describe the important enzymes required for genetic engineering.
How does the production of insulin take place in genetically modified organisms?
What is biofertilizer? A farmer is advised to add a culture of which bacterium before sowing? How is this bacterium useful to the crop?
What is gene therapy? Illustrate this using the example of adenosine deaminase (AD deficiency.
What are the major causes of the loss of biodiversity?
What are cleistogamous flowers? Can cross-pollination occur in cleistogamous flowers? State the reasons.
Write the important goals of Human Genome Project (HGP).
Describe mutualism with the help of the wasp-fig relationship.
Define any two of the following: ( Commensalism ( Logistic growth ( Parasitism
Write two useful functions of Lactic Acid Bacteria (LA.
Draw a well-labelled diagram of DNA double helix model.
Write the difference between DNA and RNA.
Describe the structure of human sperm with a well-labelled diagram.
Define population and community.
What do you mean by metastasis?
Explain the causes of Klinefelter's syndrome. Also mention the symptoms of this syndrome.
What are the finger-like projections on the edges of the infundibulum called?
If the sequence of one strand of DNA is written as follows: 5' - ATGC ATGC ATGC ATGC ATGC - 3', write down the sequence of the complementary strand in 3' → 5' direction.
PCR stands for
The exaggerated response of the immune system to certain antigens present in the environment is called
What does ELISA stand for?