List of top Questions asked in UP Board XII

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.

What is Biogas? How is it produced? Name the microbe involved in biogas production.

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.

What are the major causes of the loss of biodiversity?

What are cleistogamous flowers? Can cross-pollination occur in cleistogamous flowers? State the reasons.

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.

Define any two of the following: ( Commensalism ( Logistic growth ( Parasitism

Write the important goals of Human Genome Project (HGP).

How does the production of insulin take place in genetically modified organisms?

Describe mutualism with the help of the wasp-fig relationship.

Write the difference between DNA and RNA.

Define population and community.

Write two useful functions of Lactic Acid Bacteria (LA.

Draw a well-labelled diagram of DNA double helix model.

What do you mean by metastasis?

Describe the structure of human sperm with a well-labelled diagram.

Explain the causes of Klinefelter's syndrome. Also mention the symptoms of this syndrome.

The exaggerated response of the immune system to certain antigens present in the environment is called

PCR stands for

What are the finger-like projections on the edges of the infundibulum called?

Name the flower which shows incomplete dominance.

What is double fertilization?