1.2 Cell Organisation
1
State the levels of organisation in a multicellular organism from smallest to largest.
Answer
Cell → Tissue → Organ → Organ system → Organism.
2
Define the term tissue.
Answer
A tissue is a group of similar cells that work together to perform a specific function.
3
Give one example of a specialised cell and explain how its structure relates to its function.
Answer
A red blood cell has no nucleus, allowing more space for haemoglobin to carry oxygen. Its biconcave shape increases surface area for gas exchange.
4
What is the difference between an organ and an organ system?
Answer
An organ is a group of different tissues working together to perform a function. An organ system is a group of organs working together to perform a larger function.