Biology

Cholera is an acute diarrheal disease caused by infection of the intestine. Understanding its causative agent and transmission is essential.

• Actual Causative Agent: Cholera is caused by the bacterium Vibrio cholerae (not "Vibro-coma").

• Transmission:

• Spreads through contaminated water and food (fecal-oral route)
• Not directly transmitted from person to person through casual contact
• Poor sanitation and hygiene are major risk factors

• Options Analysis:

• (A) Vibro-coma: Incorrect spelling; the correct name is Vibrio cholerae. Even if intended as Vibrio, the option is misspelled and not the standard answer format.
• (B) Tetanus: This is a different disease caused by Clostridium tetani. It causes muscle stiffness and lockjaw, not cholera.
• (C) Influenza: This is a viral respiratory disease caused by influenza virus, unrelated to cholera.

• Why (D) is Correct:

• None of the given options correctly name the transmitting agent of cholera.
• "Vibro-coma" is not the correct scientific name.
• Tetanus and Influenza are completely different diseases.

Correct Information:

Final Answer: (D) None of these

During pregnancy, a woman’s body undergoes significant physiological changes to support the growing fetus. Various nutrients are transferred from mother to baby through the placenta.

• Calcium Requirement in Pregnancy:

• Calcium is essential for fetal skeletal development, tooth formation, heart function, and muscle contraction.
• The developing baby draws calcium from the mother’s blood to build its own bones and teeth.
• If maternal calcium intake is inadequate, the fetus will still extract calcium from the mother’s bones and teeth, leading to calcium depletion in the mother.

• Why Calcium Gets "Lost" in Blood:

• Maternal blood calcium levels may decrease because calcium is continuously transferred to the fetus.
• This can lead to hypocalcemia (low blood calcium) in the mother if not compensated by diet or supplements.

• Consequences of Calcium Deficiency:

• Increased risk of pre-eclampsia
• Muscle cramps
• Dental problems in mother
• Osteoporosis risk later in life

• Recommended Intake: Pregnant women need about 1000–1300 mg of calcium daily.

Why Other Options are Incorrect:

• (A) Thiamine: Vitamin B1; important for metabolism but not significantly depleted in blood during pregnancy.
• (C) Niacine: Vitamin B3; also important but not the primary element lost.
• (D) Calorie: Calories are energy units, not an element or nutrient that gets "lost in blood." Calorie requirement increases but it’s not a substance.

Other Nutrients Needed During Pregnancy:

• Iron (prevents anemia)
• Folic Acid (prevents neural tube defects)
• Protein
• Iodine
• Vitamin D

Final Answer: (B) Calcium

The average birth weight of a full-term newborn baby is an important indicator of health and nutrition.

Normal Range: The average birth weight for full-term babies (37-40 weeks gestation) is between 2.5 kg to 3.5 kg (approximately 5.5 lbs to 7.7 lbs).
Global Average: Worldwide, the average birth weight is approximately 3.2 kg (7 lbs).
Low Birth Weight: Below 2.5 kg is considered low birth weight, which may indicate prematurity or intrauterine growth restriction.
High Birth Weight: Above 4.0 kg is considered high birth weight (macrosomia), which may have implications for delivery.

Why Other Options are Incorrect:

• (A) 5 Kg: Too high; this would be considered very large (macrosomia) and is not average.
• (B) 7 Kg: Extremely high; not possible for a newborn—this is toddler weight.
• (C) 6 Kg: Still far above normal average birth weight.

Final Answer: (D) 2.5–3.5 Kg

Diseases spread through different modes of transmission. Some are airborne, while others spread through water, food, or contact.

Analysis of Options:

• (A) Measles: Caused by virus. Spreads through air via respiratory droplets from coughs/sneezes. Airborne disease.
• (B) Cholera: Caused by bacterium Vibrio cholerae. Spreads through contaminated water or food (fecal-oral route). Does NOT spread through air. This is the correct answer.
• (C) Cold: Caused by various viruses. Spreads through air via droplets and also through contaminated surfaces. Airborne disease.
• (D) Tuberculosis: Caused by bacterium Mycobacterium tuberculosis. Spreads through air when infected person coughs or sneezes. Airborne disease.

Conclusion: Cholera is waterborne, not airborne.
Final Answer: (B) Cholera