Presentation on theme: "Investigation 1 part 3 “Seed Soak”"— Presentation transcript:
1Investigation 1 part 3 “Seed Soak” Origin of SeedsInvestigation 1 part 3 “Seed Soak”
2Changes to SeedsObserve the changes to the seeds in the minisprouters.Share your observations.
3Inquiry IntroductionAn important part of science is asking questions about the things we observe and try to set up an investigation that will help answer those questions.What could be causing the seeds to appear swollen?If the seeds are soaking up water, how can we find out how much water the seeds are holding?
4Guide the Investigation Share your ideas on how we could investigate these questions.I have some equipment that will help you find answers.balancedry lima bean seeds
5Questions to Think About What are some ways we could measure the seeds?What should we compare the soaked seeds to?
6Investigation (cont.) Weigh 5 dry lima bean seeds. Soak the seeds. Weigh them again to find out how much water the seeds absorb.Teacher demonstrate.Make sure everyone in your group gets a turn to use the balance.Record your observations on The Soaked Seed student sheet.
7Share Results Share the results. Questions to think about: Does it make a difference where the beans or the gram pieces are placed in the cups?Does it make a difference if the gram pieces are gently placed or dropped into the cups?
8Procedure and Record Weigh the beans once more. This time, record the mass on the bottom of your Sprouting Seed student sheet.I will be assessing your technique tomorrow as you weigh the soaked beans.
9Add Water and StoreWe will add enough water to the cups so that the beans are just covered.Stack the bean cups on tops of the minisprouter and store them until next session.Leave all the gram pieces in 1 cup on the table.
10Return Equipment Clean up all materials. Check under the chairs and tables.Sit quietly so I know you are ready to move on.
11We will continue this investigation during our next session. BREAKPOINTWe will continue this investigation during our next session.
12Retrieve Place MatsOne person from your group please come retrieve your group’s place mat.Carefully walk it back to your table.
13Changes to the SeedsObserve the changes to the seeds in your minisprouters.Discuss the changes to your soaked lima beans with your group members and table mates.Estimate how much the beans have swelled.Do you estimate the beans to be the same size, twice as big, or more than twice as big as the dry beans?
14Drain the SproutersDrain the minisprouters into the big basins on your tables.If you accidentally splash or spill, please grab some paper towels and clean it up.
15Weigh the Soaked BeansI will be walking around watching you weigh the soaked beans.Weigh 5 dry lima bean seeds.Soak the seeds.Weigh them again to find out how much water the seeds absorb.Make sure everyone in your group gets a turn to use the balance.Record your observations on The Soaked Seed student sheet.
16Share ResultsTo find out how much water the beans soaked up use the following equation:Mass of the soaked beans – mass of dry beansWas anyone surprised by the result?Why do you think the seeds soak up so much water?
17Open the Lima Beans Carefully open the soaked beans. Examine the structures inside using the hand lenses.Remove the thin outer coating on the seed.Open the 2 halves of the seed.Using the hand lens, examine the inside surfaces of the seed.Share your observations.
18Seed CoatThe thin white shell that comes off the seed is the seed coat.
19embryoAlong the narrow end of one side of the cotyledon, you will find a baby plant called an embryo.Everything will be the same white color, so it will take careful observations to see the embryo.
20cotyledons The two halves of the seeds are cotyledons. The been has 2 cotyledons and is called a dicot.Corn has one cotyledon so it is a monocot.The cotyledon is part of the seed that stores the food for the young plant.
21Return Equipment Throw out the seeds. Clean up all materials. Check under the chairs and tables.Sit quietly so I know you are ready to move on.