Human Health and Nutrition

The normal RBC count in an adult male is approximately 5.0 million cells per microliter of blood, making option B correct.

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An average adult human has approximately 4.5 to 5.5 liters of blood. The range 4 to 5 liters is the most accurate among the given choices.

Blood glucose is measured in milligrams per deciliter (mg/dL) as the standard medical unit. Millimeters of Hg measures pressure, not concentration. Parts per million is for very dilute solutions. Gram per liter is used but mg/dL is more common in clinical practice.

Normal haemoglobin range for healthy adults is 12-18 g/dL (grams per deciliter). Males typically range 13.5-17.5 g/dL, while females range 12-15.5 g/dL, making 12-18 an acceptable general range. Option A (10-16) is too low for adults, Option C (14-20) is too high, and Option D has a typo (decilier) plus incorrect range.

Dietary allowance concepts include RDA (Recommended Dietary Allowance), Adequate Intake (AI), and Tolerable Upper Intake Level (UL). Food intake according to the upper limit of RDA is NOT a valid concept - UL is separate from RDA and represents the maximum safe intake, not a target intake level.

The common recommendation is to drink 8 glasses (8 ounces each) of water daily, totaling about 2 liters. This general guideline ensures adequate hydration for most adults under normal conditions. However, individual water needs vary based on activity level, climate, and body composition.

The Recommended Dietary Allowance (RDA) for protein is approximately 0.8g per kg of body weight for adults. For an average 57kg woman, this equals about 46g daily. Moderately active individuals may need slightly more.

Normal fasting blood sugar levels are typically 80-90 mg/dL (not mg/ml as written - this appears to be a unit error in the question). Post-meal levels can rise to around 140 mg/dL. Levels above 126 mg/dL (fasting) may indicate diabetes. Option C is correct in numerical value despite the unit inconsistency.

The recommended daily vegetable intake for adults is approximately 250-300 grams according to dietary guidelines from organizations like WHO and ICMR. This ensures adequate fiber, vitamins, and minerals. 250g represents a practical recommendation from nutrition science.

120/80 mm Hg is the universally accepted standard normal blood pressure reading for healthy adults. 110/75 is on the low side while 145/90 falls in the hypertensive range, making them incorrect as 'normal' values.

Normal adult blood pressure is typically defined as 120/80 mm Hg (systolic/diastolic). The systolic pressure (120) represents arterial pressure during heart contraction, while diastolic (80) is pressure between beats when the heart relaxes. This standard is based on extensive epidemiological studies linking blood pressure to cardiovascular health.

Yes, it is correct. The amount of recommended water per person, according to the UN is 50 litres.