List of top Questions asked in UP Board XII- 2026

Write the complete form of the abbreviation PCR.

Two nitrogenous bases are linked by which bond?

How many contrasting characters were included by Mendel in his experiment?

Which nitrogenous base is not present in DNA?

The process of fertilization occurs in which part of the female reproductive system?

Pollen grains are formed in which organ of the flower?

What is cancer? Describe its causes and diagnosis in detail.

What is an ecosystem? Describe the components of an ecosystem.

What is DNA fingerprinting technique? Describe in detail with a diagram.

Describe the symptoms of Down syndrome.

Draw a labelled diagrammatic sectional view of seminiferous tubules.

What is allergy? Explain with an example.

Describe the false fruit with a diagram.

Describe polyembryony with an example.

Describe palaeontological evidence with an example.

Explain convergent evolution with an example.

Describe the Hardy-Weinberg principle.

Write a short note on transfer RNA (tRNA).

State the importance of the artificial insemination technique.

Describe the ecological pyramid in brief.

Describe the process of decomposition with a diagram.

Write the names of any two projects to save rivers from pollution.

Write the names of any two atmospheric nitrogen-fixing microorganisms.

What is gel electrophoresis? Explain.

What is an external parasite? Explain with one example.