TN State Board 12th Zoology Question Paper 2024

Colostrum, the first milk produced by the mother after childbirth, is rich in IgA antibodies. IgA provides passive immunity to the newborn. IgD, IgE, and IgM do not have this primary role in colostrum.

UV rays are considered an ideal disinfectant for water treatment because they destroy microorganisms by damaging their DNA without adding any chemicals, thus not altering the water quality. Chlorination and Ozonisation are chemical treatments that add residues, and boiling consumes significant energy.

The ovary is attached to the pelvic wall and uterus by a fold of peritoneum called the mesovarium. Myometrium is a layer of the uterus; ovarian stroma is the inner tissue of the ovary; tunica albuginea is the connective tissue capsule of the ovary.

B cells are lymphocytes that specifically recognize and are activated by the presence of a specific antigen, which leads to their differentiation into plasma cells and production of antibodies.

Transcription is the biological process where a segment of DNA is copied into RNA (specifically mRNA) by the enzyme RNA polymerase. Replication involves DNA synthesis, while translation is the process of protein synthesis from mRNA.