Find out about plants and what they need to grow. Read books, magazines or ask professionals who might know in order to learn about plant growth. Also study about salt and its uses. Keep track of where you got your information from.
Following are samples of information you may find:
Plants are essential to life. Not only they remove carbon dioxide from air and supply oxygen to the air, they also act as the base of many food pyramids.
How much oxygen do plants produce? Why do some plants grow more quickly than others? Why won’t some plants grow at all in Saskatchewan? If using fertilizers helps plants grow, will using more fertilizers help them even more? How does saline soil inhibit plant growth?
These are some of the questions which can be considered during this unit. Encourage your students to go beyond the information in the resources and the bounds of the classroom walls to find out about plant growth, and the importance of plants to our lives.
What Do Plants Need to Grow?
Just like humans, seeds have important, basic needs that must be met if they are to thrive and grow:
- Water-Water is the first step to a seed’s waking up. When a seed takes in water, its outer coat splits. Then the baby plant, called an embryo, can get the oxygen it needs from the soil. Plants always need water, which carries important nutrients from the soil to the plant.
- The Right Temperature-Seeds wait for just the right weather to leave their coats behind and begin to grow. Some seeds, like peppers and tomatoes, require warm temperatures to germinate, while others, like lettuces, need cooler temperatures.
- Soil with Room to Grow-The root is the first thing to emerge from the seed. When the young shoot begins to grow, the seed has become a seedling, nourished in this earliest stage by food that was stored inside the seed. As roots grow, they allow a plant to absorb water and nutrients. They also anchor plants in the soil. To help them get nutrients and grow, plants need healthy soil which is well aerated; that is, loose enough for air to move though it.
- Sunlight and Air-When the seedling’s first real leaves come through the soil, the plant switches to making its own food. Using sunlight and nutrients from the soil in a process called photosynthesis, the leaves of the plant change energy from the sun into food so it can grow. Plant leaves also need to breathe air to help with photosynthesis.
With the help of water, sunlight, and healthy soil, a little, dormant seed has everything it needs to transform itself into a strong, healthy plant. Nature’s way of providing us with delicious, nutritious food truly seems like a miracle.
These are some uses of salt:
Groceries spray vegetables by water so the vegetables will stay fresh.
Osmosis is used in dialysis machines to filter blood of diabetic patients.
Reverse osmosis is used to get fresh water from salt water.
When you eat salt you feel thirsty because salt sucks the water out of your body cells.
When you sprinkle salt on pilled eggplants or cucumbers, water drops will form on the surface. Salt sucks the water out of the cells. Cooks do this to increase the firmness of eggplants.