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Combined Science: Biology

GCSE · Edexcel · higher

QuestionsFlashcards

Disease
Defence Against Disease
Development of Medicines
- Antibiotics
  4
- Discovery & Development of New Drugs
  6
Non-Communicable Diseases
- Lifestyle & Non-Communicable Disease
  8
- Cardiovascular Disease
  6

The Organism in the Environment
Human Influences on the Environment
- Human Impact on Biodiversity
  6
- Benefits of Maintaining Biodiversity
  6
Cycles within Ecosystems

Root Hair Cells Flashcards

All 4 cards in this deck

How is the shape of a root hair cell adapted for absorbing water and mineral ions?: A long, narrow extension gives a large surface area, and the thin cell wall gives a short distance for water and ions to cross.
Why do root hair cells contain many mitochondria?: To release energy by respiration for the active transport of mineral ions into the cell.
By which processes does a root hair cell take in (a) water and (b) mineral ions from the soil?: (a) Water by osmosis, down a concentration gradient. (b) Mineral ions by active transport, against the concentration gradient, using energy from respiration.
True or false? Root hair cells contain chloroplasts so they can photosynthesise.: False. Root hair cells have no chloroplasts, because roots are underground and receive no light.