Human nutrition

© UCLES 2025 5090/12/O/N/25 [Turn over 11 A woman went to the doctor with the following symptoms: ● severe joint and leg pain ● swollen and bleeding gums ● skin that bruises easily. What should the doctor test the woman’s blood for? A the concentration of vitamin C B the concentration of vitamin D C the concentration of iron D the concentration of calcium 6

© UCLES 2025 5090/12/O/N/25 13 Villi and alveoli have certain common features. What is not a feature of villi and alveoli? A a rich capillary network B a single-celled layer of epithelium C lacteals connected to the lymphatic system D a very large total surface area 7

The vegetables and fruits provide some of the protein, carbohydrates and lipids needed in a balanced diet. Name three other components of a balanced diet that can be obtained from vegetables and fruits.

State two reasons why plant oils and other lipids are important in the human diet.

Use Table 2.1 to calculate the percentage that plant protein sources contribute to the recommended average daily protein intake for humans.

The global average daily human intake of red meat is approximately 300% of the recommended amount. Calculate how much red meat an average human eats in a year (365 days). Give your answer in kilograms.

It is more energy efficient for humans to eat plants. Explain why.