Explanation

• White blood cells (leukocytes) are part of the immune system.
• They play a key role in defending the body against infections, diseases, and foreign invaders.
• They help maintain overall health.

Last verified on 09-11-2026

Explanation

• Cholera is an infectious disease caused by the bacterium Vibrio cholerae.
• Symptoms include severe diarrhea, dehydration, and vomiting.
• Cholera can be prevented by clean drinking water and proper sanitation.

• It mainly spreads through contaminated water and food.
  It is most common in areas with poor hygiene and overcrowding.

Last verified on 3-03-2026

Explanation

• Iodine deficiency causes goiter, an enlargement of the thyroid gland.
• Iodine is essential for the production of thyroid hormones.
• Severe iodine deficiency during pregnancy or early childhood can impair brain development.

Last verified on 07-09-2026

Explanation

• Tuberculosis, typhoid, pneumonia and cholera are caused by bacteria.
• Tuberculosis is caused by Mycobacterium tuberculosis.
• Typhoid is caused by Salmonella Typhi, while cholera is caused by Vibrio cholerae.
• Bacterial pneumonia can be caused by Streptococcus pneumoniae.

Last verified on 02-11-2026

Explanation

Iron deficiency can lead to Anaemia, a condition characterized by:

• Low red blood cell count
• Pale skin
• Fatigue
• Shortness of breath
• Dizziness

Last verified on 02-11-2026