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2. (a) (i) State two differences in composition between soil air and atmospheric air - Leaving Cert Agricultural Science - Question 2 - 2007
Question 2
2. (a) (i) State two differences in composition between soil air and atmospheric air. (ii) Explain how any one of the differences you have mentioned occurs. ... show full transcript
Worked Solution & Example Answer:2. (a) (i) State two differences in composition between soil air and atmospheric air - Leaving Cert Agricultural Science - Question 2 - 2007
Step 1
Step 2
Explain how any one of the differences you have mentioned occurs.
Answer
The higher concentration of carbon dioxide in soil air is primarily due to the respiration of soil organisms and the decomposition of organic matter. As microorganisms break down organic materials, they release carbon dioxide, which accumulates in the soil.
Step 3
Describe an experiment which compares the movement of water by capillarity within two contrasting soils.
Answer
To perform this experiment, take two samples of different soils and place them in suitable apparatus, such as graduated cylinders or capillary tubes. Fill each with equal amounts of water and allow them to sit for a period. Measure the level of water in each sample at regular intervals to compare the capillary rise. Record the differences in the water levels to draw a conclusion about the capillarity of each soil type.
Step 4
Explain how each of the following influences the temperature of a soil:
Answer
- Aspect: South-facing soils generally heat up faster due to increased sunlight exposure.
- Colour: Dark soils absorb heat more effectively compared to lighter soils.
- Water content: Wet soils are slower to heat up, as they have higher specific heat capacity than dry soils.
- Location: The latitude and height above sea level, or proximity to the sea, affect temperature variation in soil.