1 / 12

Looking Inside an Onion

Looking Inside an Onion. Microworlds Lesson 11. Think & Wonder. Blood Cells. When Robert Hooke looked at a sliver of cork under his microscope, he saw rows of “little empty boxes” that reminded him of rows of prison or monastery cells.

daire
Download Presentation

Looking Inside an Onion

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Looking Inside an Onion Microworlds Lesson 11

  2. Think & Wonder Blood Cells • When Robert Hooke looked at a sliver of cork under his microscope, he saw rows of “little empty boxes” that reminded him of rows of prison or monastery cells. • He was the first to describe these structures, and in naming them coined a new use for the word “cell”. *

  3. Think & Wonder • Other scientists have called them “the building blocks of all living things. • In this lesson you will move from the outside of an onion in, until you reach the smallest living unit, the cell. *

  4. CELLULAR STRUCTURES • Cell wall • supports and gives shape to the cell. • Cell membrane • Holds the living parts of the cell • Nucleus • The control center for the cell *

  5. FOR EACH TEAM small onion slices 1 water dropper bottle 1 pair of scissors 1 pair of forceps toothpicks Paper towels or newspaper FOR EACH STUDENT LRB 1 microscope 1 hand lens 2 slides Activity Sheet 6 Materials FOR THE CLASS 1 container of rinse water

  6. Process • Observe the outside of the onion. • Describe the exterior and record this in your LRB. • Sketch your prediction of the interior in the appropriate location on Activity Sheet 6. • Now, sketch what you see when the onion is sliced lengthwise. * Remember: Predictions are never incorrect. Do not change your prediction, they are a record of your thinking, not observations!

  7. Process • What do you think the onion will look like if you cut it through the roundest part? • Sketch and record this in your LRB and Activity Sheet 6. • Now, sketch what you see when the onion is cut through the roundest part. • Sketch your prediction of the onion under the microscope. *

  8. Process • Separate the layers of the onions. Using your fingernails or the forceps, peel off a piece of the thin skin found between the layers. • Lay the ½ inch long piece of onion skin flat on your slide. (Be careful not to fold or wrinkle it!) • Use a toothpick to smooth it out. • Squeeze a drop or two of water on top of the onion skin, then lower a cloverslip or slide on top. *

  9. Onion Cells

  10. CLEAN-UP • Please clean the slides thoroughly. • Cut and glue your activity sheet into your LRB.

  11. Final Activity • Cells were named by Robert Hooke because their shape reminded him of small, boxlike, prison or monastery cells. Other scientists have called cells “the building blocks of all living things.” • Reflect on why cells are compared to building blocks. • Record this in your LRB. *

  12. Update your Table of Contents

More Related