| 1 | 2 | 3 | 4 | 5 |
| 100 | 100 | 100 | 100 | 100 |
| 250 | 250 | 250 | 250 | 250 |
| 500 | 500 | 500 | 500 | 500 |
| 1000 | 1000 | 1000 | 1000 | 1000 |
| 2000 | 2000 | 2000 | 2000 | 2000 |
| Final Question | ||||
The predictable and orderly changes that occur in nature
The predictable and orderly changes that occur in nature
ecological succession
Broad-leaved trees are this type of wood.
Broad-leaved trees are this type of wood.
hardwood
Evergreens and conifers are this type of wood.
Evergreens and conifers are this type of wood.
softwood
What is the difference between primary and secondary succession.
What is the difference between primary and secondary succession.
Primary succession occurs when the soil base has been completely destroyed and a new substrate is left. Secondary succession occurs after a disturbance in which the soil base is not completely destroyed. Some animals and plants may also remain.
Explain how soil is formed in primary succession.
Explain how soil is formed in primary succession.
Pioneer species such as lichen, moss, and weeds begin to grow on the new substrate. Lichen secrete acids that help break down the rock. Seedlings from other plants help to split the rock apart with their roots. When these plants die, they decompose and become organic matter that mixes with the broken rocks. A rich soil base then forms.
One stage of succession
One stage of succession
sere
Hardened lava and bare rock are examples of new this.
Hardened lava and bare rock are examples of new this.
substrate
Explain why fires are not always considered bad.
Explain why fires are not always considered bad.
Many times the undergrowth in forests becomes too thick. Fires are a natural way of clearing out this unwanted brush. Fire also stimulates the regrowth of certain plants such as sagebrush, aspen, and willows. The intense heat opens lodgepole pine cones, releasing the seeds inside. Fires can help bring balance back into an ecosystem.
Explain why the eruption of Mount Saint Helens could be an example of both primary and secondary succession.
Explain why the eruption of Mount Saint Helens could be an example of both primary and secondary succession.
The areas that were affected by lava had to begin with a new substrate, causing primary succession to occur. The areas in which seeds and roots survived are an example of secondary succession because the soil base was not destroyed.
Why is a glacial retreat so devastating to the land? What type of succession does it initiate?
Why is a glacial retreat so devastating to the land? What type of succession does it initiate?
Glacial retreats are devastating to the land because they scour the earth and leave nothing but bare rock behind. Primary succession then begins.
Determines how severely a disturbance affects an area.
Determines how severely a disturbance affects an area.
topography
The study of the relationships between organisms and their environments
The study of the relationships between organisms and their environments
ecology
What type of succession am I? forrest fire
What type of succession am I? forrest fire
secondary succession
Describe what the four stages of succession might look like after a glacial retreat.
Describe what the four stages of succession might look like after a glacial retreat.
***
The first plants to grow in a barren land, such as lichen.
The first plants to grow in a barren land, such as lichen.
pioneer species
In both primary and secondary succession, plant begin to do this in the area.
In both primary and secondary succession, plant begin to do this in the area.
colonize
What type of succession am I? volcano
What type of succession am I? volcano
primary succession
What type of animals are show up first during ecological succession?
What type of animals are show up first during ecological succession?
insects
Occurs after a new substrate is formed.
Occurs after a new substrate is formed.
primary succession
The plant life in an area is called this.
The plant life in an area is called this.
vegetation
What type of succession am I? flood
What type of succession am I? flood
secondary succession
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