Extracts from this document...

Introduction

Plant Science Lab Report Aim: To study the effect of salt (NaCl) concentration on plant growth Hypothesis: I believe that the plant which has the highest concentration of salt will have its growth affected and the NaCl will cause the plants' size to decrease. In my opinion the plant which will grow is the plant without any salt. This is because plants need salt, but in a small amount unlike humans. Too much salt in a plant can cause the death of the plant. When there is a large amount of salt in a plant, the salt will become toxic. The salt can dehydrate the cells within, causing the plants to die. This happens to more than just one cell. The effect of the salt can cause enough cells to decease, to kill an entire plant. When the cells are dehydrated, the plant turns yellow. Not only cells are affected in this process, the photosynthesis system can also get affected also. ...read more.

Middle

But in the third beaker place 15g of salt and label the plant with the 15g of salt as "C". In the fourth beaker place 20g of salt and label the plant with the 20g of salt as "D" 11- Using the ruler, read the height of each plant daily for seven days Labelled Diagram: Results: No NaCl (a) +or- 0.1 cm 5g of NaCl (b) +or- 0.1 cm 15g of NaCl (c) +or- 0.1 cm 20g of NaCl (d) +or- 0.1 cm Day 1 (no salt) 11.1 10.1 8.2 18.1 Day 2 11.3 10.3 8.4 18.1 Day 3 11.6 10.6 8.7 18.1 Day 4 13.3 10.9 9.1 17.8 Day 5 14.1 10.6 8.5 17.8 Day 6 14.2 10.1 7.9 17.6 Day 7 14.5 9.8 7.8 17.6 Change 3.5 -0.3 -0.4 -0.5 % Change 0.32 -0.03 -0.05 -0.03 Rate 0.5 -0.04 -0.06 -0.07 Data Processing: Conclusion: From the table of results we can clearly see that plant "a" was not affected due to the non existence of salt [NaCl] in it. ...read more.

Conclusion

They might have touched or affected in a way * Due to weekends the calculation of the plant height was not based on a consecutive 7 day period. It was based on 7 days in school which was not consecutive. This may have affected the numbers we have gathered * The method of using the ruler to calculate the height was inaccurate as because it depended on readings by the naked eye * The salt was not spread out evenly onto the plant * To avoid mistakes with the ruler we could use a measuring tape which would give us more accurate results * Place the plants in a safe area were they could not be touched and were they could receive all the factors needed such as sunlight * Take the calculations daily and consecutively by doing the experiment at home instead of leaving it in school on weekend * Separate the soil without harming the plant and use a spray to spray the salt water onto the plant and in order to make the salt spread out evenly ?? ?? ?? ?? Internal Assessment Lab Report Rudain Mahasneh 1 ...read more.

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.