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Biology

GCSE · Edexcel

QuestionsFlashcards

Photosynthesis
Plant Structure
Transport in Plants
Plant Hormones
- Plant Hormones & Growth
  7
- Using Plant Hormones Commercially
  7

Transport in Animals
- The Need for Transport
  7
- Factors Affecting the Rate of Diffusion
  7
Respiration
- Respiration
  6
- Practical: Investigating Respiration
  5
Gas Exchange
Circulatory System
- The Blood & Blood Vessels
  6
- The Circulatory System
  8

Active Transport Flashcards

All 6 cards in this deck

What is active transport?: The movement of substances across a membrane against a concentration gradient (from low to high concentration), using energy from respiration.
Where does the energy for active transport come from?: Respiration in the cell (which takes place mainly in the mitochondria).
How do root hair cells take up mineral ions from the soil?: By active transport — ions move against the concentration gradient into the cell, using energy from respiration.
True or false? Root hair cells absorb water from the soil by active transport.: False. Water enters root hair cells by osmosis; only mineral ions are taken up by active transport.
Which of diffusion, osmosis and active transport are passive (need no energy from respiration)?: Diffusion and osmosis are passive and move substances down a concentration gradient; only active transport requires energy.
Give one example of active transport in the human digestive system.: Glucose is absorbed from the small intestine into the blood by active transport, even when the blood glucose concentration is higher.