Specialised cellsIB MYP Biology: Flashcards
What these 12 flashcards ask
- Why is a red blood cell biconcave?
- Why do red blood cells have no nucleus?
- How are white blood cells adapted to their function?
- What does a nerve cell do?
- Name two features of nerve cells.
- How is a root hair cell adapted?
- How is a sperm cell adapted to swim?
- What does the head of a sperm contain, apart from the nucleus?
- Why does an egg cell have a large cytoplasm?
- Why do palisade cells contain many chloroplasts?
- Why is xylem hollow with no end walls?
- What strengthens the walls of xylem?
Exam questions on Specialised cells
- A haematologist examines a drop of blood under a microscope. She sees a very large number of small, round cells with a dip in the middle and no nucleus, and a few larger cells that have a lobed nucleus and an irregular outline.Explain how two features of red blood cells help them to carry oxygen.2 marks
- A botanist studies the cells of a young plant. She identifies palisade cells near the top surface of a leaf, root hair cells on the surface of a root, and xylem vessels carrying water up the stem.Explain how the structure of a palisade cell helps it to carry out photosynthesis.2 marks
- A student wants to find out whether root hair cells help a plant to absorb water. She sets up two cress seedlings of the same species in identical test tubes of water, with a thin layer of oil on top of the water to stop evaporation. She cuts the bottom 1 cm off the roots of one seedling, which removes its root hairs, and leaves the roots of the other seedling whole. She leaves both for 24 hours.State a testable hypothesis for the investigation, with a scientific reason, and identify the independent variable.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).