Earthworm experiments, experiments on the effects of light on earthworms

Earthworms prefer moist, moist and nutritious soil.

1. Ask the question: Does light have an effect on the distribution of earthworms?

2. Make an assumption: light has no effect on the distribution of earthworms.

3. Make a plan:

Create both light and no light environments (controlled experiment principle).

Other conditions are the same and appropriate (single variable principle).

4. Observe the distribution (cover one side with a saucer, the other side unchanged) <>

Experimental steps: 1. Prepare two piles of 4 earthworms.

2. Pour one side of the earthworm into a light environment as the experimental group;

The earthworm on the other side is poured into a dark-free environment as a control group.

3. Let stand for three minutes to observe the distribution of earthworms.

Results: Earthworms crawl towards the holes, but in the dark direction, and finally there are two (0) in the light and 6 in the dark.

Conclusion: Light has an effect on the distribution of earthworms.

The experimental procedure is as follows:

1. Take two mineral water bottles and cut them into cups, respectively fill the darker clay, the middle is filled with lighter sand, and the upper layer is filled with darker clay, each layer is slightly pressed, and the soil of the mineral water bottle is kept at a certain humidity, and the total volume of the three layers of soil accounts for about three-quarters of the volume of the glass cylinder, so as to keep the bottle with enough air.

2. Choose a few good earthworms.

Place in a bottle with earthworms in it.

3. Put the above device in a warm and dark place for 5-6 days to observe the stratification and looseness of the soil.

1) On the first day of observation, it was very smooth, the earthworm burrowed into the soil, and there was no change.

2) On the third day of observation, there was no change in the sandy soil without earthworms, and the sandy soil with earthworms gradually merged.

3) On the sixth day of observation, the changes were obvious, the sandy soil with earthworms was obviously fused together, and the soil voids became larger and softer.

Experimental conclusion: The impact of earthworms on the environment is that earthworms dig holes to loosen the soil, decompose organic matter, create good conditions for the growth and reproduction of soil microorganisms, and promote acidic or alkaline soil to become neutral soil, increase phosphorus and other available components, and make the soil suitable for the growth of crops. In terms of soil improvement, elimination of pollution, protection of the ecological environment, material cycle, biodiversity.

At present, many countries use earthworms to dispose of household waste.

Organic waste and purified sewage.

Earthworms contribute to the material circulation and energy transfer of soil processes through activities such as feeding, digestion, excretion, secretion and burrowing, and are soil invertebrates that have an important impact on many processes that determine soil fertility.

One of the taxa, known as ecosystems.

Engineer.