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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

Xylem & Phloem Flashcards

All 4 cards in this deck

Give three features of the structure of a xylem vessel.: Thick walls strengthened with lignin; dead cells with no cytoplasm; no end walls, forming continuous hollow tubes.
Give two features of phloem tissue that suit it to transporting sucrose.: Living cells with sieve plates (pores in the end walls) for sap to pass through, and companion cells with many mitochondria to supply energy.
True or false? Xylem carries sucrose from the leaves to the rest of the plant.: False. Xylem carries water and mineral ions from the roots; phloem carries sucrose.
In a micrograph of a plant stem, how can you recognise the xylem vessels?: They appear as hollow tubes with thick lignified walls and no cytoplasm inside.