Cell organisation: tissues, organs and systemsEdexcel A-Level Biology A: Flashcards
What these 12 flashcards ask
- Give the levels of organisation in a multicellular organism.
- What is a tissue?
- What is an organ?
- What is an organ system?
- Name three tissues found in the small intestine.
- What is meant by division of labour?
- What does a cell do when it differentiates?
- Name two plant tissues and their functions.
- Which tissue in a leaf is the main site of photosynthesis?
- Give an example of an organ system and its organs.
- Why does a large organism need organ systems?
- Why is the stomach an organ and not a tissue?
Exam questions on Cell organisation: tissues, organs and systems
- The wall of the small intestine is made of several types of cell. The inner lining is a layer of epithelial cells with microvilli that absorb nutrients. Beneath it is connective tissue containing blood vessels, and around the outside are layers of smooth muscle that contract to move food along.Explain why the small intestine is an organ rather than a tissue.2 marks
- A leaf from a privet shrub has an upper epidermis, a layer of palisade mesophyll, a layer of spongy mesophyll, vascular bundles containing xylem and phloem, and a lower epidermis with stomata surrounded by guard cells.Explain the advantage to a large multicellular plant of having its cells organised into specialised tissues.2 marks
- The wall of the stomach contains glandular epithelium, whose cells secrete hydrochloric acid, the enzyme pepsin and mucus. It also contains layers of smooth muscle, connective tissue with blood vessels, and nervous tissue.Describe how cells are organised into an organ system, using the stomach as an example.3 marks
Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).