1. Will Plants die if soil is watered with slightly less saline water than ocean water? What is the level of salinity that hinders the growth of a plant?
Method: For this project, you need nine beans, nine lettuce seeds and nine zucchini. All these need to be cultivated as indoor plants.
Take water of three levels of salinity; 30g of salt per liter, 15 g of salt per liter and fresh water. Create three groups with three of each type in one group. Each group should be watered with three types of water.
In the original experiment, it was observed that after ten days of testing, all the plants were dead. Then again four plants of each type were re-grown. Two of each type was watered with solution of 5g per litre and two at 10g per litre. Do as directed and observe their progress.
The experiment results are quite interesting as it shows that plants cannot survive in water of high salinity though rate of tolerance varies in different plants.
2. What specific wavelength of light is needed for photosynthesis?
Method: You can perform this experiment with bean sprouts. In addition, you need cellophane sheets of different colors; red, green, blue and yellow.
Take eight pots and sow the same number of seeds in the same conditions in each pot. Cover every two pots with four different colored cellophane sheets. Water them and place them in sunlight. Observe the progress of sprouts on a daily basis and note down the results. You are observing the plants in order to compare them.
3. How do different types of light affect plant growth?
Method: Cultivate three plants of the same type in three pots with the same soil conditions. Place all three pots in different light conditions:
- one in high sunlight exposure.
- one in medium light exposure.
- one in an area getting very little sunlight.
Observe the plants for a week or two and monitor their growth.