Factors Affecting Malaria Distribution via Mosquito Breeding Conditions

Steps:

• Identify that malaria spreads through Anopheles mosquitoes, which require warm temperatures and standing water to breed and expand geographically.
• Assess factor 1: Higher global temperatures enable mosquitoes to survive in cooler regions previously unsuitable, broadening their range.
• Assess factor 3: Increased irrigation creates more stagnant water pools in fields, boosting mosquito breeding sites and local transmission, aiding global spread.
• Assess factors 2 and 4: Antibiotics target bacteria, not malaria parasites or mosquitoes; reduced rainfall limits water availability, shrinking breeding areas.

Why 1 and 3 increase distribution:

• Mosquito life cycle accelerates in warmer conditions (optimal 20–30°C per entomology studies), and irrigation adds essential breeding habitats.

Why the options are wrong:

• A includes irrelevant factor 2.
• B omits key factor 3 and includes irrelevant 2.
• C and D include factors 2 and 4 that do not promote spread.

Final answer: None (correct factors are 1 and 3)