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Cell Structure and Organisation
Quick questions on Levels of organisation explained: O-Level Biology
9short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are examples in plants?Show answer
The same idea applies to plants. A palisade cell is a cell; the palisade layer is a tissue; the leaf is an organ; the shoot (leaves, stem and buds) is part of the plant system; and the whole plant is the organism.
What is cell?Show answer
The basic unit of life. Each cell is specialised for a job, such as a muscle cell or a nerve cell.
What is tissue?Show answer
A group of similar cells that work together to carry out a particular function. For example, muscle tissue is made of many muscle cells that contract together.
What is organ?Show answer
A structure made of several different tissues working together to perform a function. The heart, for example, contains muscle tissue, nerve tissue and blood vessels.
What is organ system?Show answer
A group of organs that work together to carry out a major life process. The digestive system, for example, includes the stomach, intestines, liver and pancreas.
What is organism?Show answer
A complete living thing made up of several organ systems working together, such as a human or a plant.
What is q1?Show answer
Write the levels of organisation in order from smallest to largest. [2 marks]
What is q2?Show answer
Define an organ. [2 marks]
What is q3?Show answer
Explain why division of labour is an advantage for a large organism. [2 marks]