4-mark practice questions — Pearson Edexcel International GCSE Biology (4BI1)
134 questions · biology · View as Markdown
How to answer
4-mark questions are the shortest levels-of-response band. Aim for four scientific ideas, each in its own short sentence.
Sample questions
- Describe the role of nitrifying bacteria and denitrifying bacteria in the nitrogen cycle.
- Describe the roles of the sensory neurone, relay neurone and motor neurone in carrying a nerve impulse during a reflex a…
- Explain why oxygen moves from the air in the alveoli into the blood in the surrounding capillaries during gas exchange i…
- Describe the role of stomata and the spongy mesophyll layer in gas exchange in a flowering plant.
- Describe the role of xylem vessels in the transport of water through a flowering plant, including the features of xylem …
- Muscle is a tissue found in the wall of the stomach. The stomach works together with other organs such as the pancreas a…
- Describe the functions of the nucleus, mitochondria, ribosomes and cell membrane in a eukaryotic cell.
- Describe the process of eutrophication and explain how it leads to a reduction in the number of animal species living in…