Answer: A

Explanation:

·         Helper T cells assist other immune cells, including B cells and cytotoxic T cells.

·         Cytotoxic (Killer) T cells directly destroy infected or cancerous cells.

·         Regulatory T cells help prevent autoimmune responses and maintain immune system balance.

·         Memory T cells provide long-term immunity by recognizing and responding to pathogens encountered in the past.

Answer: A

Explanation:

• Statement 1 is correct. The Moidams of the Ahom Dynasty were added as India's 43rd UNESCO World Heritage Site during the 46th World Heritage Committee session held in 2024 in New Delhi.


• Statement 2 is incorrect. Moidams are royal burial mounds associated with the Ahom Dynasty in Assam, not the Mughal period. The Ahoms ruled the region for nearly 600 years.


• Statement 3 is correct. The Moidams are located in Assam, and their inclusion on the World Heritage List is a reflection of India's efforts to preserve its cultural and historical heritage.

Answer: B

Explanation:

• Statement 1 is correct. The World Heritage Convention adopted in 1972 aims to preserve both cultural and natural heritage sites, recognizing places with outstanding universal value.


• Statement 2 is correct. To be added to the UNESCO World Heritage List, a site must meet at least one of the ten criteria which include historical, cultural, natural, and exceptional universal value.


• Statement 3 is incorrect. India ratified the World Heritage Convention in 1977, not 1975.

Answer: B

Explanation:

·         Statement 1 is correct. The Asian Giant Tortoise is the largest land tortoise in mainland Asia, reaching sizes up to 60 cm long.

·         Statement 2 is correct. Its diet consists of leaves, fruits, mushrooms, and decaying plant matter, reflecting its role as a herbivore in forest ecosystems.

·         Statement 3 is incorrect. The Asian Giant Tortoise is diurnal (active during the day) and thrives in humid tropical and subtropical forests, not dry forests.

·         Statement 4 is incorrect. The lifespan of the tortoise ranges from 80 to 100 years, making it a long-lived species.

Answer: A

Explanation:

·         Statement 1 is correct. T cells are a type of white blood cell that play a central role in immune defense by identifying and destroying infected or cancerous cells.

·         Statement 2 is incorrect. T cells do recognize antigens (foreign pathogens), but they do not produce antibodies like B cells.

·         Statement 3 is correct. T cells are produced in the bone marrow and mature in the thymus, where they learn to distinguish between self and foreign antigens, a process critical for immune tolerance.