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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

Factors Affecting the Rate of Water Uptake Flashcards

All 6 cards in this deck

What effect does an increase in light intensity have on the rate of water uptake by a plant?: It increases it — the stomata open wider in the light, so more water evaporates from the leaves.
What effect does increased air movement (e.g. a fan) have on the rate of water uptake by a plant?: It increases it — moving air removes water vapour from around the leaf, increasing evaporation/diffusion of water vapour from the leaf, so the plant takes up more water.
What effect does an increase in temperature have on the rate of water uptake by a plant?: It increases it — water evaporates and diffuses out of the leaves faster.
What is the equation for the rate of water uptake measured with a potometer?: rate of water uptake = volume of water taken up ÷ time taken (e.g. mm³ per minute)
In an experiment on the effect of a fan on water uptake, why is the volume of water taken up also measured with the fan switched off?: As a control, to compare the effect / to give a baseline measurement.
Why does a potometer only give an estimate of the rate of transpiration?: It measures water uptake, not water loss; it assumes the plant loses as much water from its leaves as it takes up.