Earthworms have a beneficial effect on the physical and chemical properties of soil. Earthworms change the structure of the soil and improve water drainage. As earthworms dig through compacted soil, they ingest the soil and grind it up. They move organic matter from the surface and mix it deeper into the soil. In the forest, this organic matter is called duff, mostly litter from fallen leaves and decaying branches.
Earthworms benefit plants in every conceivable way. Their burrowing creates channels through which plant roots may more easily penetrate the soil. Earthworms aid in the formation of humus, the organic matter in soil. A high level of humus is associated with soil fertility, so worms are beneficial to forests, agriculture, and gardens. Worm excretions are a valuable source of nitrogen, which assists in plant growth. The bodies of earthworms are rich in proteins, minerals, and vitamins, and when worms die these nutrients are released into the soil.
Earthworms are an important link in the food web because they are a food source for numerous species of animals. They are preyed upon by many species of birds, snakes, and mammals, as well as invertebrates such as beetles and snails. Earthworms are also used as bait in sports fishing and as animal feed in poultry farming. With the help of gardeners and sports fishermen, earthworm populations continue to spread, sometimes at the speed of ten meters a year. Wherever they go, earthworms are a positive force in the ecosystem.
In the set of materials, the reading states that earthworms are useful to the whole ecosystem, while the professor refutes the author’s points one by one by providing supporting details.
Firstly, the reading claims that earthworms have beneficial effects on the physical and chemical properties of soil, because they move organic matters, called duff, from the surface and mix it deeper into the soil. On the other hand, the professor asserts that earthworms cause a significant damage to the forests by removing the organic materials from the surface. Forests receive damage significantly from...
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| 2015-05-26 | SarahAlsalihi | 60 | view |
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On the contrary
Attribute Value Ideal
Score: 27 in 30
Category: Excellent Excellent
No. of Grammatical Errors: 1 2
No. of Spelling Errors: 0 2
No. of Sentences: 13 12
No. of Words: 264 250
No. of Characters: 1385 1200
No. of Different Words: 124 150
Fourth Root of Number of Words: 4.031 4.2
Average Word Length: 5.246 4.6
Word Length SD: 2.772 2.4
No. of Words greater than 5 chars: 117 80
No. of Words greater than 6 chars: 96 60
No. of Words greater than 7 chars: 57 40
No. of Words greater than 8 chars: 45 20
Use of Passive Voice (%): 0 0
Avg. Sentence Length: 20.308 21.0
Sentence Length SD: 7.268 7.5
Use of Discourse Markers (%): 0.615 0.12
Sentence-Text Coherence: 0.43 0.35
Sentence-Para Coherence: 0.631 0.50
Sentence-Sentence Coherence: 0.156 0.07
Number of Paragraphs: 4 4