Specialised cells, tissues, organs and systemsIB MYP Sciences: Mind map

Exam questions on Specialised cells, tissues, organs and systems

1. A doctor in Riyadh explains to a class how the human body is organised, using the stomach as an example. The stomach wall contains muscle tissue that churns food, glandular tissue that makes digestive juices, and a lining of protective cells. The stomach is part of the digestive system.
   Explain why the stomach is called an organ rather than a tissue.2 marks
2. A student is comparing specialised cells in humans and plants, including red blood cells, sperm cells and the root hair cells of a seedling.
   Explain how the structure of a red blood cell makes it suited to carrying oxygen.2 marks
3. Biologists in Brazil study the structure of a leaf. The leaf has a protective layer of cells on its surface, palisade cells just below the upper surface where most photosynthesis takes place, and veins that carry water and sugars through the leaf.
   Describe how a palisade cell is adapted for photosynthesis.3 marks