TN State Board 12th Zoology Question Paper 2025

Swelling due to infection or tissue injury is a sign of inflammation. Inflammation is the body's protective response to remove the injurious agent and initiate healing. Phagocytosis is the ingestion of microbes by cells, while mechanical and physiological barriers are first-line defenses that prevent entry of pathogens.

The first codon to be deciphered was UUU, which codes for phenylalanine. This was established during the early genetic code experiments. The other options are incorrect because AAA does not code for proline, TTT is a DNA triplet not an mRNA codon, and GGG codes for glycine, not alanine.

Klinefelter’s syndrome is wrongly matched here because it is found in a male with an extra X chromosome, i.e. XXY male, not XXY female. Down’s syndrome is trisomy 21, Turner’s syndrome is XO female, and Patau’s syndrome is trisomy 13.

The Neanderthal man had a brain capacity of about 1200 cc. Hence option (d) is correct. The other values do not represent the accepted brain capacity of Neanderthals.

Syphilis, chlamydiasis and gonorrhoea are all bacterial sexually transmitted diseases. Syphilis is caused by Treponema pallidum, gonorrhoea by Neisseria gonorrhoeae, and chlamydiasis by Chlamydia trachomatis. Trichomoniasis is protozoan and candidiasis is fungal, so the other options are not correct.