Cell organisation: tissues, organs and systemsEdexcel A-Level Biology A: Mind map

Exam questions on Cell organisation: tissues, organs and systems

1. 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
2. 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
3. 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