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BIOLOGICAL DRAWINGS FROM MICROSCOPE SLIDES A comparative analysis
ELODEA LEAVES showing one or more hook cells on the edge of a leaf
low A cell arrangement OK but: proportions are off; tip of hook cell inaccurate, chloroplasts too big for cell … overall, too stylised for a drawing
N proportions way off; hook cell curved on wrong side; inconsistent representation of the cell wall
low M angle between leaf and hook cell is a bit too wide
A tip of hook cell doesn’t show its main special feature i.e. thick cell wall
high A cells a bit wide and too rounded at ends
N cell shapes wrong cells don’t look like part of a leaf interlocking of cells doesn’t match slide hook tip has not been thickened! chloroplasts drawn too large
A cell outlines too wavy; tip of hook cell inaccurate; chloroplasts drawn carelessly (have hair!)
A cells too far apart; shapes don’t interlock well
M immediately obvious which cells have been drawn
A cell shapes don’t interlock enough chloroplasts too big for cells cell wall thickness too variable
LEAF TEARS showing a stoma and guard cells surrounded by epidermal cells
some shape mismatch sketchy lines chloroplasts open! A
M could have shown: membranes of plasmolysing cells, thick edges of guard cells around the stoma opening
M shapes, proportions and spacing excellent
A guard cells drawn far too large and cell shapes don’t match
N significant mismatch of shapes and sizes
M could have shown membranes of plasmolysing cells air bubble!
M obvious from shapes which cells have been drawn
A cell junctions misplaced shapes don’t match the specimen very well
specimen is clearly well understood by person drawing M
N epidermal cell shapes a poor match and way too small compared to guard cells; not enough cells drawn
M accurate, but ideally should show a couple more complete cells
A nuclei and shapes don’t match specimen very well
N mismatch of shapes and proportions; cells being “scalloped” off first cells; two cells drawn as one?
A guard cells way too small
A cells too angular guard cells too small
M clear match
A cell junctions don’t match and proportions are off
A cell proportions off: three need to be narrower for M
M clear match to specimen
M starts of walls of surrounding cells show that these cells are part of a larger piece of tissue
A guard cells drawn too elongated epidermal cell shapes do not match specimen well
SPIROGYRA a unicellular organism that lives in threads with other Spirogyra
…but why would you even try to draw something this hard? M
Gas Exchange in Plants and Xerophytic Adaptations - Be able to describe how a plant is adapted for efficient gas exchange with minimal water loss.
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STOMATA ON LEAVES. GUARD CELL EPIDERMAL CELLS CELL WALL STOMA (PORE)
Big picture: Learning outcomes Demonstration – 1.Drawing the masks basic shapes 2.Discuss what different levels Complete drawing stage Review progress.
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NAME: DATE: PERIOD: FOCUS on the LEAF Plants are organisms, made of two organ systems: the shoot system, and root system The plant leaf is an organ of.
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Leaf Structure Mr. Hefti – Pulaski Biology. Identification: 1.Cuticle 2.Upper epidermis 3.Mesophyll Transport tissues Xylem Phloem Palisade layer Spongy.
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NOTES –2 Main Groups of Eukaryotic Cells. All eukaryotic cells have a… cell membrane, cytoplasm, and DNA in a nucleus (and ribosomes too)
Lab: Comparing Plant and Animal Cells B I O L O G Y I. PURPOSE: 1. Use staining techniques to identify some of the basic structures found in animal and.
Plants A study of multicellular organisms. Cell Specialization Why do cells specialize? –Increase efficiency Division of labor –What does efficiency look.
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Functions of plants Quiz 13A. Plants are supported by two related systems: cell walls- cellulose turgor pressure - water pressure inside a plant cells.
Auxiliary Views. Auxiliary view –Orthographic projection of an angled surface –Appears foreshortened in a typical multi-view drawing Auxiliary views are.
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Internal structure of a leaf A leaf consists of following layers. Cuticle Upper epidermis Palisade mesophyll Spongy mesophyll Lower epidermis Pores also.
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Don’t Be Cheeky! 1. Using a tooth pick, gently scrape the inside of your cheek. 2. Place the cells on to the slide. 3. Place one drop of iodine onto your.
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