B4

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  • Created by: Rachel-D
  • Created on: 21-03-14 18:46
What is zonation?
Gradual change in species distribution across a habitat.
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Native ecosystems are..
Not man made. Woodland, lakes. They have a wider biodiversity than artificial ecosystems.
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What is a community? And a population?
a community is made up of the organisms living there. A population is the number of a particular organism in a community.
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What are the two stages of photosynthesis?
1) Light energy splits water into oxygen gas and hydrogen ions. 2)Carbon dioxide gas combines with the hydrogen to make glucose and water.
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What does isotope experiments show?
Oxygen comes from water.
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What are limiting factors in photosynthesis?
Carbon dioxide, Light and temperature.
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How are leaves adapted for efficient photosynthesis?
Large surface area, thin, contain pigments, have vascular bundles and guard cells.
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What is diffusion?
It is the net movement of particles from a high concentration to a low concentration?
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How is the rate of diffusion increased?
It is increased by a shorter distance, a greater concentration gradient and a greater surface area.
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What is transpiration?
Is the evaporation and diffusion of water from leaves.
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How is the transpiration rate increased?
It is increased by increased light intensity, temperature, air movement and a decrease in humidity
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What is osmosis?
The net movement of water from a high to a low water concentration across a partially-permeable membrane.
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What are minerals absorbed by?
Active transport which needs energy.
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What are the four main minerals, that plants need?
Nitrates, phosphates, potassium and magnesium.
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Why do the plants need the four main minerals?
Nitrates ~ for cell growth. Phosphates ~ Respiration and growth. Potassium ~ Respiration. Magnesium ~ Photosynthesis.
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What does organic farming use?
Animal manure, crop rotation, weeding and differing planting times.
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What is organic farming?
Does not use artificial fertilisers or pesticides.
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Advantage of biological control.
No chemical pesticides.
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Disadvantage of Biological pesticides.
The introduced species eating other useful species; showing a rapid population increase, so they become pests.
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What is biological control?
Uses living organisms to control pests.
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Advantage of Hydroponics.
Better control of mineral levels and disease.
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Disadvantage of Hydroponics.
Concerns about the effects of extensive use of chemicals on soil structure.
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What are detritivores?
They feed on dead and decaying animals.
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What type of fungi uses extracellular digestion?
Saprophytic
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Other cards in this set

Card 2

Front

Native ecosystems are..

Back

Not man made. Woodland, lakes. They have a wider biodiversity than artificial ecosystems.

Card 3

Front

What is a community? And a population?

Back

Preview of the front of card 3

Card 4

Front

What are the two stages of photosynthesis?

Back

Preview of the front of card 4

Card 5

Front

What does isotope experiments show?

Back

Preview of the front of card 5
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