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biology alevel questions on succession - would appreciate any help

1) explain how succession brings about changes in soil
2) Which can be used to determine if there’s an association between length of time since glacial ice has melted and soil depth
a) chi squared
b) correlation coefficient
c) standard deviation
d ) T-test
(edited 1 year ago)
Original post by zara ijaz
1) explain how succession brings about changes in soil
2) Which can be used to determine if there’s an association between length of time since glacial ice has melted and soil depth
a) chi squared
b) correlation coefficient
c) standard deviation
d ) T-test

1)
Succession is the process by which the structure and function of an ecosystem changes over time. In terms of soil, succession brings about changes in the composition and structure of the soil.

Initially, during the early stages of succession, the soil is typically nutrient-poor and has a low level of organic matter. This is because the first colonizers, such as lichens and mosses, are able to grow in these conditions and break down rocks to form a thin layer of soil.

As the succession progresses, more complex plants, such as grasses and shrubs, begin to grow and provide a source of organic matter for the soil. These plants add nutrients to the soil through the process of photosynthesis and the decomposition of their leaves and roots. This leads to an increase in the amount of organic matter in the soil, improving its structure and nutrient content.

As the succession continues, the soil becomes more fertile and can support more complex ecosystems, such as forests. The roots of these plants penetrate deeper into the soil, providing additional structural support and increasing the porosity of the soil. This allows for better water retention and the growth of a more diverse range of plants and animals.

Overall, the process of succession leads to a significant improvement in the quality and fertility of the soil, allowing for the growth of more complex and diverse ecosystems.

2)
Correlation Coefficient

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