Youtube Exercise » English Grammar Homework

The importance of bacteria in soil

supart suayprakhon

19 views 8 years ago

Warm-up Questions

What do you think “The importance of bacteria in soil” means?
How might bacteria help plants grow?
What problems could happen if soil does not have the right balance?

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The importance of bacteria in soil

Soil pH and why plants may not grow well (00:00 – 00:45)

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1. What is soil pH a measure of?

How much water the soil holds
The soil temperature
The acidity or alkalinity of the soil
How many insects live in the soil

2. What pH range does the video say is best for healthy plants?

Between 5.0 and 6.0
Between 3.0 and 4.0
Between 8.5 and 9.5
Between 6.2 and 7.0

3. According to the video, acidic soil is typically due to which causes?

Fertilizer use, rainfall, and decomposition of organic matter
Too many earthworms
Too much sunlight and wind
Excess calcium carbonate in dry environments

The importance of bacteria in soil

Bacteria, nutrient availability, and symptoms of wrong pH (00:45 – 01:55)

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1. Why are some minerals and nutrients “worthless to the plants” without good bacteria?

They turn into insects
They get bound or stuck to the soil so plants cannot absorb them
They evaporate into the air
They make the soil colder

2. What can happen to leaves when soil pH is high, according to the video?

They grow larger overnight
They become covered in black spots
They turn purple
They show yellowing

3. What is magnesium described as being part of in green plants?

Topsoil
Chlorophyll
Fertilizer
Calcium carbonate

The importance of bacteria in soil

Using dolomite: testing soil and application methods (01:55 – 02:23)

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1. What does the video suggest doing first to know how much dolomite to use?

Add more fertilizer immediately
Remove all organic matter
Conduct a soil test
Water the plants every day

2. How can dolomite be applied according to the video?

By freezing it and crushing it
By sprinkling it onto the topsoil
Only by burning it
Only by mixing it into a drink

3. What does the dolomite rod do in the soil?

It removes all minerals from the soil
It slowly releases nutrients over a long period of time
It changes the soil into sand
It makes the soil colder quickly

The importance of bacteria in soil

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1. What is the main message of the video?

Soil pH and good bacteria help plants access nutrients and grow healthily
Only fertilizer matters for plant growth
Plants do not need minerals if they get enough sunlight
All soils should always be very acidic

2. Why does an imbalanced soil pH cause problems for plants?

It stops rainfall from happening
It makes nutrients unavailable or stuck in the soil
It increases the number of plant leaves automatically
It creates extra sunlight

3. Which solution does the video present for raising soil pH?

Removing bacteria from the soil
Using dolomite
Planting only at night
Adding sugar water

Discussion Questions

Discuss the ideas from this video

The importance of bacteria in soil

Have you ever had a plant that did not grow well even when you used fertilizer? What do you think the reason was?
Why might “what you don’t see” (like bacteria) be as important as what you can see in a garden?
What could be the benefits and risks of adding something to change soil pH (like dolomite)?
If you could test your soil, what information would you want to know first (pH, nutrients, something else)? Why?