Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Roughage, also known as dietary fibre, is primarily provided by plant products such as whole grains, pulses, fruits, and vegetables.
While roughage does not provide any nutrients, it is an essential component of our food as it adds bulk and helps the body get rid of undigested food.
Water is crucial for the body to absorb nutrients from food and plays a vital role in transporting substances within the body.
Water helps in the excretion of waste products from the body in the form of urine and sweat.
Most of the water needed by our body comes from liquids we drink (like water, milk, tea) and from the water content in cooked foods and fresh fruits/vegetables.
A balanced diet must contain adequate amounts of all nutrients along with sufficient roughage and .
📐Formulae
💡Examples
Problem 1:
Why is it recommended to eat whole fruits instead of just drinking fruit juice to maintain a healthy digestive system?
Solution:
Whole fruits provide significant amounts of roughage (dietary fibre).
Explanation:
Juicing often removes the fibrous pulp of the fruit. Roughage is essential to assist the movement of food through the gut and prevent constipation, whereas juice provides mainly sugar and vitamins without the bulk required for healthy digestion.
Problem 2:
Calculate the approximate mass of water in a student's body if they weigh , assuming water makes up of human body mass.
Solution:
Explanation:
Since water constitutes approximately of the body weight, we multiply the total weight by to find the mass of present in the body.
Problem 3:
State two ways in which leaves the human body as waste.
Solution:
- Urine, 2. Sweat.
Explanation:
The body uses water to dissolve waste products. These are then expelled through the kidneys as urine and through the skin pores as sweat to maintain internal balance and temperature.