Do Plants Need Soil? | Grade 5 | Unit 1 - Concept 1 - Lesson 2 | Science

شرح ساينس الصف الخامس الابتدائي لغات - الفصل الدراسي الأول
شرح ساينس خامسة ابتدائي - ترم أول
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In This Lesson:
► Activity :
we will germinate some seeds in a wet paper towel, measure their growth and then compare their growth to the growth of the other seeds which are placed in soil.
Plastic cup contains
potting soil Paper towels Six bean seeds
(Fava beans)
Plastic plate Water Metric ruler
► Steps :
1. Use the water to wet the paper towel.
2. Place three seeds in the top half of the paper towel and fold the bottom half of the towel up so that it covers the seeds then, place the paper towel inside the plastic plate.
3. Plant the other three seeds in the cup that contains potting soil then, water the seeds.
4. Place the plate and the cup in a place where they can get sunlight.
5. Check the growth of seeds over the next several days. Wet the paper towel and water the soil as needed.
6. Measure the growth of each seed using the metric ruler.
► Observations
The initial growth of the seeds placed in the paper towel is similar to that of the seeds planted in the soil.
The seeds grown without soil would not grow as quickly as the seeds in the soil.
► Conclusions
1. The seeds can grow without soil if they have water and Sun.
2. Plants can grow without soil for a while, but finally they need soil.
Sunlight: A Basic Need
Plants make their own food through the photosynthesis process
Photosynthesis process
It is the process through which plants use the energy in sunlight to make their own food.
How can plants make their own food through photosynthesis process ?
1. Green plants use their leaves to collect sunlight and carbon dioxide from the air.
2. Plant roots absorb water from the soil.
3. Inside the green plants, sunlight allows carbon dioxide to combine with water to
produce:
• Oxygen which is released in the air to help living organisms breathe.
• Sugar (the food of plant) which gives the plant the energy it needs to grow.
So, photosynthesis process can be represented as follows:
we will do an experiment to show the effect of light on plant growth.
► Tools :
Two plastic cups Two bean seeds Potting soil Water
► Steps :
1. Add soil to the two cups, place the bean seeds on the soil, one per cup and cover the seeds with about 2 centimeters of soil.
2. Add the same amount of water to each cup to moisten the soil.
3. Place the red cup where it will receive light and place the blue cup in the dark.
4. Water both plants regularly and observe them along two weeks.
► Observations
After two weeks, we observe that:
The plant in the red cup grow taller than the plant in the blue cup.
The plant in the red cup has four leaves with dark green color, while the plant in the blue cup has two small leaves with pale green color.
► Conclusions
Sunlight is a basic need for the plants like water and air.
Sunlight is important to plant growth, because plants use sunlight to make their own food, so the plant without sunlight does not grow well because it had less food.
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