Monday, April 18. AZ Merit Reading and Math part 2

Transcription

1 Monday, April 18 AZ Merit Reading and Math part 2

2 Tuesday, April 19 Please start a new warm-up Write the date and the question 4/19: What are 3 things that You think all living things must Have in order to survive?

3 Reminder: -Support our #1 Softball Team today at 4:30 -Boulder Creek Meet the Coaches night 4/20 at 6:30

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6 How do organisms maintain stable internal conditions? Objective of the day... -Identify when osmosis is occurring (and in which direction water is moving) Mission: We will be incredible science students.

7 Adaptations Table of Contents Date Title Page # 4/19 Needs of living things and Homeostasis This will give you this paper 12

8 Potato Predictions

9 Potato Predictions 1. What do you predict will happen if we put a square piece of potato into saltwater? 2. What do you predict if we put a square piece of potato into plain water?

10 Be careful with triple beam balances these are new. Make sure that they are pointed at 0 and all riders are at 0 before you start.

11 Potato Predictions -Red cup is for saltwater (from pitcher) -Blue or purple is for plain water (from sink) Using a graduated cylinder, determine what the initial volume of each potato cube is (keep these separate so you know which is going into salt water and which is going into plain water). Use triple beam balance to measure the mass. Put them into appropriate cups with water (Blue or purple=plain water, red=salt water)

12 What does every living thing NEED in order to live?

13 Energy Some organisms make their own food autotrophs (plants) Others cannot make their own food heterotrophs (animals)

14 Water EVERY organism needs water Used to break down food, make chemical reactions occur

15 Living Space Everyone needs a place to live, get food, have shelter Some move, some don t

16 Stable Internal Conditions The maintenance of stable internal conditions despite changes in the surroundings is called homeostasis (ex: our body temperature remains about 98.6 even when it s colder or hotter around us)

17 Examples of things that our bodies keep stable: Temperature -Warm blooded (mammals, birds) do this internally Endothermic -Cold blooded (reptiles, amphibians) do this through environment Ectothermic ph Glucose levels Pathogens (fights against bacteria and viruses) Balance of water and other materials in our cells

18 Balance of Water A cell membrane acts like a gatekeeper. It is selectively permeable - some materials can pass through it while others cannot. It is usually permeable to substances such as oxygen, water & carbon dioxide. These move into and out of the cell by passive transport - the movement of materials through a cell membrane without using energy

19 Watch as I spray the Glade then raise your hand when you smell it What did you observe?

20 Diffusion is the process by which molecules tend to move from an area of higher concentration to an area of lower concentration. The concentration of a substance is the amount of the substance in a given volume or area.

21 Draw what you see happen here

22 What causes diffusion? Molecules are always moving. As they move, they bump into each other. The more that there are, the more they bump into each other. When they collide, they push away. Eventually they spread out evenly.

23 Osmosis is the diffusion of water molecules through a selectively permeable membrane. It is important because cells need water to function properly.

24 Water moves from areas of low solute (stuff dissolved in water) concentration (where there is a higher concentration of water molecules) to areas of higher solute concentration (where there is a lower concentration of water molecules).

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26 Gummy Bear Data Color Current Prediction After soaking in water for 1 day Length (mm) Volume (ml) Cover with water in the bowl and then set it on the counter after you make your measurements. EXPLAIN your predictions in terms of osmosis. What do you think will happen and why?

27 EXPLAIN your predictions in terms of osmosis. What do you think will happen and why?

28 Wednesday, April 20 Write the date and the question 4/20: What does selectively permeable mean? (look at your notes from yesterday)

29 Wednesday, April 20 Write the date and the question 4/20: What does selectively permeable mean? (look at your notes from yesterday) Some materials can pass through while others cannot (this is how we describe the cell membrane)

30 Wednesday, April 20 Write the date and the question 4/20: What does selectively permeable mean? (look at your notes from yesterday) Some materials can pass through while others cannot (this is how we describe the cell membrane)

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32 Reminder: -Boulder Creek Meet the Coaches night Tonight at 6:30 -If you have a library book to return, Please give it to me.

33 How do organisms maintain stable internal conditions? Objective of the day... -Identify when osmosis is occurring (and in which direction water is moving) Mission: We will be incredible science students.

34 Collect Data and Clean Up Collect potato data Rinse out cups and stack them on the counter Collect gummy bear data (gently) do the length first thing before it breaks Rinse out bowl and stack up on counter When done, return all materials (graduated cylinders, triple beam balance, ruler) Potatoes and gummy bears go into the trash

35 Potato Results Gently pat each potato with a paper towel. Determine the volume of each cube after soaking. Determine the mass. Write down any other observations in the notes area.

36 Gummy Bear Data Color Current Prediction After soaking in water for 1 day Length (mm) Volume (ml)

37 So, what happened here in terms of osmosis and WHY? To answer that, we are going to look at what happens eggs in different solutions and also what happens to fish in different types of water.

38 Adaptations Table of Contents Date Title Page # 4/20 Osmosis This will give you this paper 13

39 Please read the article quietly to yourself. As you read, underline where it talks about the movement of water.

40 Selectively permeable membrane Solute Water Which direction is the water going to move? Water moves to the left

41 Kidneys filter to remove the salt, excretes very small amount of highly concentrated urine Excretes a lot of diluted urine Fish drinks very little water To compensate for water loss, fish drinks a lot of water Lots of salt in the water Water moves out of the fish and into the saltwater by osmosis Some water moves into the fish by osmosis

42 These 3 blood cells were all put into different solutions. One was put into a solution of saltwater, one was put into a solution of distilled water, and the other was put into a solution of plasma (the liquid that blood cells are normally in). Next to each picture, indicate which solution the cell was put into and then explain what happened (in terms of osmosis). This is what red blood cells normally look like. This blood cell was put into plasma (normal conditions). The movement of water in and out of the cell was equal. This blood cell was put into saltwater. There was a higher concentration of water INSIDE the cell so the water moved out causing it to shrink. This blood cell was put into distilled water. There was a higher concentration of water OUTSIDE of the cell so the water moved into the cell causing it to swell and burst.

43 Osmosis Rap

44 Thursday, April 21 Write the date and the question 4/21: Which direction will the water flow? A to B or B to A Explain your reasoning. Side A Side B

45 Thursday, April 21 Write the date and the question 4/21: Which direction will the water flow? A to B or B to A Explain your reasoning. The water concentration is higher on side A and the solute concentration is higher on side B, so the water moves towards B to try to reach equilibrium. Side A Side B

46 Thursday, April 21 Write the date and the question 4/21: Which direction will the water flow? A to B or B to A Explain your reasoning.

47 How do organisms maintain stable internal conditions? Objective of the day... -Identify when osmosis is occurring (and in which direction water is moving) Mission: We will be incredible science students.

48 On your paper, write your name. Then, DESCRIBE what happened (include data)to your potatoes and gummy bear and EXPLAIN the results in terms of osmosis. If you didn t get the results that you expected, tell what should have happened and what sources of error there may have been. Feel free to also include sketches

49 Sign out a laptop Complete the online webquest with a partner use the pages that are listed at the top of your paper On the back, find 5 examples of how organisms maintain homeostasis or have unique ways that they meet their needs. Describe those below and name the organism.

50 No School Friday, April 22