**Question:** Energy required by a heavy worker female (in kcal/day): March 2013 (d, f)

**Core Concept:** Energy requirements in humans are determined by various factors, including body weight, sex, age, activity level, and climate. The Harris-Benedict equation is commonly used to estimate energy expenditure.

**Why the Correct Answer is Right:** According to the Harris-Benedict equation, the energy required (in kcal/day) for a female of a certain age (March 2013) can be calculated as follows:

B = 10 * (W/220) * (H/10) * (1.2 + (0.0003 * Age) + (0.0020 * W/H^2))

Where:
- B represents the daily energy requirement in kcal/day
- W is the weight in kg
- H is the height in cm
- Age is the age in years

In this case, the heavy worker female's weight (W) is given as "heavy worker female" (HWF), which is typically around 70 kg. The height (H) is not provided in the question, but we can assume a reasonable value for calculation. Let's use 160 cm as an example.

**Why Each Wrong Option is Incorrect:**

**Option A:** The age of 20 is too low for a heavy worker female. An adult female would require a higher energy expenditure.

**Option B:** Using a height of 150 cm is inaccurate and results in an unreliable estimation of daily energy requirement.

**Option C:** The equation used is incomplete, lacking the weight and height inputs, making it unsuitable for calculating energy requirements.

**Option D:** Using a height of 180 cm is unrealistic for a heavy worker female, leading to an inaccurate estimation of daily energy requirement.

**Correct Answer:**

To calculate the daily energy requirement for a heavy worker female, we can use the following equation:

B = 10 * (W/220) * (H/10) * (1.2 + (0.0003 * Age) + (0.0020 * W/H^2))

Using a reasonable weight of 70 kg for a heavy worker female, and assuming a height of 160 cm (which is a typical height for a female), we can calculate the daily energy requirement as follows:

B = 10 * (70/220) * (160/10) * (1.2 + (0.0003 * 25) + (0.0020 * 70/160^2))

B = 10 * (1/2.2) * (16/1) * (1.2 + 0.0003 * 25 + 0.0020 * 70/160^2)

B = 10 * (0.45