List of top Questions asked in TN HSE+2 (Class XII)- 2026

Explain the experimental proof of DNA replication by Meselson and Stahl.
Darwin’s finches and Australian marsupials are suitable examples of adaptive radiation – justify the statement.
Write a note on Protozoan diseases.
Difference between Active and Passive immunity.
What are recombinant vaccines? Explain their types.
Write the causes for infertility in males and females.
“Alien species invasion is a threat to endemic species” – Substantiate this statement.
What is SMOG and how is it harmful for us?
What is gene "knock out"?
Name the active chemical found in the medicinal plant Rauwolfia vomitoria. What type of diversity it belongs to?
Classify the antibiotics based on their action on bacteria.
Describe the structure of the human ovum with a neat labelled diagram.
Give an account on population regulation.
Mention the symptoms of Phenylketonuria and Down’s Syndrome.
Differentiate hibernation and aestivation.
What are the gases that cause the Green House Effect?
Draw Gemmule in sponges and label the parts.
What are the three strategies to be implemented in India to attain total reproductive health?
Why are sex linked recessive characters more common in the male human beings?
What are the three structural differences between RNA and DNA?
Why is it not possible to produce a vaccine against the "common cold"?
Define gametogenesis.
What is inhibin?
Differentiate - Leading strand and Lagging strand.
How does Neanderthal man differ from the Modern man in appearance?