I feel like the dominant emotion at the time was happy however I felt as if the pace of the lesson was quit slow, however I liked the aspect that it was hands interactive.
Learning about Bio will help me in the future to analyse certain things that I am unsure about and apply my learning.
Today we had to pair up and use a microscope, we have done this in the past and i feel like today was a ” brush up lesson” to remember how to use one precisely.
We had to find the nuclear and the semi permeable membrane of a cheek cell and a par of a plant. To get a cheek cell I am had to get a cotton swab and wipe the inside of my mouth to get the cells. I then placed them onto the slide and added methaline blue and then put a glass slip on top. this was the same process for the plant in terms of setting up the slide. We successfully found these two things under the microscope however it was hard to zoom into it and find it again under a more zoomed in view. I am unable to insert images however here is a link:
9/11/17:Self taught lesson
My partner Ian and I decided to do the practical on osmosis first to set it up and get going then we will do practice questions and worksheets to develop our understanding further.
1) we added 4ml of salt solutions with different concentrates into 5 different test tubes then labeled them
2) we cut cylinder shaped potatoes up all of them with the length of 2 cm
3) we then weighed each one and made a note of it by writing it on the test tubes
4) we added the potatoes into the substances and set a timer for 20mins
For the practical there was a question that we had to answer:
Which potato would we expect to lose the most water?
– I expect that the 0.1 as it is the highest concentration (0.5) therefor it will be absorbed the fastest due to the amount of salt in the water. Wheres with 0.1 has more of a water based solution, Thus needs less water to achieve a equilibrium
End weight: 0.8
End weight: 0.7
Start wight: 0.70
End weight: 0.68
Osmosis definition: a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one. ( this is a definition from the internet (official definition))
Osmosis is important in our lives because: a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.
Today we learnt how to differentiate a hypotonic and hypertonic solutions. We looked at the case study of boiled eggs. The definitions are as follows:
Solutes: A dissolved substance
Water Potential: The amount of water that is in a solution
Hypertonic solution: Has a higher concentration of solutes and a lower concentration of water (low water potential)
Hypotonic solution: Has a lower concentration of solutes and a higher concentration of water (high water concentration)
Isotonic solution: This is when the level of solutes and water potential has hit an equilibrium on the inside and out side of the semi-permeable membrane.
We also took a look at how with would impact cells.
A turgid cell is a slightly swollen. This occurs when cells are placed in a hypotonic solution. This is rarely a issue due to the fact that the cell wall is able to take the extra push.
A flaccid cell is shrivelled and occurs when a cell is in a hypertonic solution. This a a major issue as it means the cell lack the nutrients needed.