PTE · Read Aloud

Science and Practice of Composting: PTE Read Aloud practice questions

5 original Read Aloud questions. Question 1 is free to record, play back and compare with a sample answer right here; log in free to practise the rest in the BandLadder app.
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  • PTE Academic and PTE Core
1

Role of Carbon Nitrogen Ratios

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Look at the text below. You have 30–40 seconds to prepare, then read it aloud as naturally and clearly as you can after the tone.

Maintaining an optimal balance of carbon and nitrogen remains essential for efficient decomposition. When carbonaceous materials exceed recommended thresholds, microbial activity slows down markedly. Conversely, excess nitrogen generates unpleasant ammonia gas, which indicates that biological degradation has become imbalanced and requires immediate remediation.

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Questions 2–5

Look at the text below. You have 30–40 seconds to prepare, then read it aloud as naturally and clearly as you can after the tone.

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2

Moisture Regulation in Windrows

Proper moisture levels facilitate the transport of dissolved nutrients across bacterial cell membranes. If the moisture content drops below forty percent, biological metabolism ceases almost entirely. However, excessive saturation restricts oxygen diffusion, causing anaerobic pockets to develop within the core of the compost pile.

3

Soil Structure and Humus Formation

Mature compost enriches degraded soils by introducing stable organic matter known as humus. Because humic substances bind mineral particles into porous aggregates, treated soil retains greater volumes of water and resists mechanical erosion. Consequently, root systems penetrate compacted substrates with substantially less resistance.

4

Suppression of Plant Pathogens

High temperatures generated during thermophilic phases eliminate most fungal pathogens and weed seeds. Furthermore, beneficial antagonistic microorganisms colonise the finished product, producing natural antibiotics that suppress soil-borne diseases. Farmers who apply fully matured compost often observe a noticeable reduction in crop infections.

5

In Vessel Composting Systems

Enclosed automated drums provide precise environmental control over temperature, aeration and moisture. Although initial capital expenditure remains high, these mechanical reactors accelerate processing times from several months to mere weeks. Municipalities frequently favour such technology because it limits offensive odours in densely populated districts.

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