Explanation : Projects in mathematics are aimed at enhancing problem solving skills, establishing interdisciplinary linkages, promoting skills but not for scoring marks. Hence, option (C) is correct.
Explanation : Tuberculosis (TB), Pneumonia and Typhoid are diseases caused by bacteria. TB is caused by Mycobacterium tuberculosis bacteria, Pneumonia is caused by Streptococcus pneumoniae and Typhoid is caused by Salmonella typhi Bacteria.
Explanation : Mainly all veins have thin walls and they carry deoxygenated (CO2) blood from organs to heart except for pulmonary vein which carries oxygenated blood from lungs to heart.