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23 Cards in this Set
- Front
- Back
Define conditions. |
The framework but is not consumed. |
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Define resources. |
They are consumed and can be a limiting factor. |
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Name some conditions. |
Temperature, humidity, pH, salinity, physical forces and pollution. |
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What are the effects of temperature? |
It effects physiological rates, as all organisms have an optimal temperature. |
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What is an endotherm? |
Regulates their temperature by producing heat. |
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What is an ectotherm? |
Relies on external sources of heat, have had to evolve strategies to evade extreme temperatures. |
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What are the effects of humidity? |
-Terrestrial organisms lose water by evaporation. -Relative humidity influences the rate of water loss. Drier the environment the greater the rate of water loss. |
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What are some forms of humidity avoidance and adaptation? |
-Aestivation (Summer sleep) -Plants can have leaf pubescence (Hairy surface) -Mammals can have hair and no sweat glands. |
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What are the effects of pH? |
-In soil it affects the availability of minerals to plants. -It is toxic to plants at extremes. -It reduces species richness at lower extremes. |
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What are the effects of salinity? |
-In salt water organisms if hypotonic lose water by osmosis. -Salt is excluded by impermeable roots which are highly suberised. -White mangroves secrete excess salt directly. |
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What are the effects of physical forces? |
Disturbance by waves, wind, fire and animal activity can lead to damage and death. |
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What are the effects of pollution? |
By products of human activity such as heavy metals, acid rain, oil and pesticides. |
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What types of resources are there? |
Biotic and abiotic components of the environment which are utilised and depleted by the activity of individuals. |
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What resources do autotrophs use? |
-Solar radiation -Water -Mineral nutrients: -Macronutrients - N,P,S,K,Ca,Mg,Fe -Mirconutrients - Mn,Zn,Cu,B,Mo -Carbon dioxide -Oxygen |
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Define the relationship and adaptations between plants and solar radiation/light. |
-Plants differ in their ability to utilise light in photosynthesis. -There are sun species and shade species. Growth form reflects strategies. |
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Plants and there relationship with water and mineral nutrients. |
-Taken up from the soil. -Plants have different strategies e.g., shallow or deep roots. Root architecture changes with resource availability and management. -Require nutrients in different proportions. |
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What do heterotrophs need. |
-Organic matter (carbon chains) -Water -Mineral nutrients -Oxygen |
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What types of heterotrophs are there? |
Decomposers - feed on detritus. Parasites - feed on living hosts. Predators - eat animal prey. Grazers/herbivores - eat plants. |
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Define space in detail. |
It can be considered a proxy resource since control of space may provide key resources e.g., water light and nutrients. Further it can be limited as it can provide sites for nesting and territory sizes. |
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What influences conditions and resources? |
Availability, abundance and distribution. |
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Define habitat. |
Habitats are actual physical places that provide conditions and resources and can satisfy the requirements of a range of species. A habitat is where an organism lives. Habitats can provide many different niches. |
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Define an ecological niche. |
It's not a place it's an idea. It's a summary of an organism tolerances and requirements, a set of conditions and resources. |
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When was the idea of ecological niches proposed and who by? |
Hutchinson in 1957. "The total range of environmental variables to which aspecies must be adapted (physical, chemical & biotic) andunder which a species population replaces itself indefinitely." |