B14b Communities and adaptations Flashcards
What is an ecosystem?
Interaction of a community of living organisms with the
non-living parts of their environment
Name four things that plants compete for
Light
Mineral ions
Water
Space
Name three things animals compete for
Food and water
Space (territory)
Mate
What is interdependence?
Different species in an ecosystem depend on each other for resources, if one species is removed the community may be affected
What is a stable community?
All the biotic and all the abiotic factors are balanced
so that population sizes remain relatively constant
What are abiotic factors?
Non- living factors
What are biotic factors?
Living factors
State the abiotic factors that may affect an ecosystem
Light intensity
Temperature
Moisture
Soil pH and mineral content
Wind intensity and direction
Carbon dioxide level
Oxygen level
Why might light intensity affect an ecosystem?
Different plant species may have different optimum light intensities for growth
Light is needed for photosynthesis
Plants provide all the food for the ecosystem
Why might temperature affect an ecosystem?
Different species of plants and animals have different optimum temperatures for growth and survival
How does soil pH affect an ecosystem?
Certain plans grow better in acids or alkaline soils.
Can affect the appearance of plant eg hydrangea flowers
How does moisture level affect an ecosystem?
Many plants cannot survive in water logged soil as their roots cannot get oxygen for respiration
Some plants are adapted to live in high or low moisture areas
How does wind intensity affect an ecosystem?
Determines how far seeds can be dispersed by the wind.
Increases transpiration rates
Can affect the growth pattern of plants
How does soil mineral content affect an ecosystem?
Minerals are needed by plants to make amino acids and proteins
Animals gain their amino acids directly or indirectly from plants.
How does carbon dioxide concentration affect an ecosystem?
Higher carbon dioxide concentration leads to more plant growth
Global warming and destruction of habitats