Please find the two docs that we reviewed in class below. These can also be found in the grade 6 weekly schedule in the science section. Good luck, and a reminder that your parachute build and questions are due for Monday March 30th before class begins.
Unicellular organisms are composed of a single cell, unlike multicellular organisms that are made of many cells. This means that they each live and carry out all of their life processes as one single cell. Most unicellular organisms are microscopic;
Also called microorganismsor microbes since they are only visible under a microscope.
The single cell is responsible for feeding, digestion, excretion and reproduction.
Some microorganisms make us sick, but without the others we could not survive.
The following are examples of unicellular organisms:
Multicellular Organisms Defined:
A tissue, organ or organismthat is made up of many cells is said to be multicellular. Animals, plants, and fungi are multicellular organisms and often, there is specialization of different cells for various functions. In contrast, unicellular, or single-celled organisms are much smaller in size and less complex as they are composed of just one cell that senses its environment, gathers nutrients and reproduces asexually. The following are examples of multicellular organisms: human beings, organs and tissues, plants, animals, birds and insects.
~Generally speaking, we can say that unicellular and multicellular organisms are alike in that they exhibit all the functions of life, such as metabolism and reproduction, they contain DNA and RNA, they can exhibit a wide range of lifestyles, and they are essential to almost every ecosystem that we currently know of.
Amoeba, Euglena, Paramecium on the move
The paramecium are the larger protists, amoeba are the blob-like protists, and euglena are the smaller unicellular organisms.
Hello grade 8, please watch the video below and then answer the questions at the bottom of the post in a google doc. Share your doc with me firstname.lastname@example.org and have your answers with you when we meet during Monday’s live session. I hope everyone is doing well, and there is no baby update except that our bags are packed and ready at any point!
I realized that the screen went black on the last slide of the screencast. Here is the slide on Turgor Pressure to go along with the audio.
Before you answer the following questions, if you have not done so already, please create a folder in your google drive called ‘Science’ to put all of your docs/resources for Science in one spot and keep you organized.
Questions – share #1-5 with me
How are osmosis and diffusion different? How are they the same?
What determines the direction of water movement into or out of cells?
What prevents a plant cell from bursting when it is full water?
Explain why animal cells are more likely than plant cells to burst when placed in distilled water (only H2O particles)?
Describe turgor pressure in your own words.
Challenge questions (not mandatory, but you are encouraged to try and answer them!)
a) Based on what you have learned about osmosis, explain why grocery stores spray their vegetables with water?
b) You lose a solution of salt and water when you perspire. After extreme exertion on a very not day, a person who drinks only water to replace lost fluid may become ill. An examination of the person’s blood after drinking the water would reveal that many red blood cells have become swollen and that some have ruptured. Why would the red blood cells burst?