Title: Tradescantia leaf epidermis
Magnification : 100x
Image : tradescant.jpg
Keywords : leaf, plant, vascular
Text: This shows the leaf surface of Tradescantia.
The dark green lines are veins (vascular tissue) that bring water and minerals
into the leaf, and transport organic molecules away from the leaf. The whitish
areas are stomata, small holes in the leaf that allow carbon dioxide to diffuse
into the leaf for photosynthesis. Oxygen diffuses out of the leaf during the
day. The high magnification shows the two guard cells around a single stoma.
Most plants open their stomata during the day and close them at night.
Click here to see
another image.
Title : Onion root tip : mitosis Magnification : 100x Image : roottip.jpg
Keywords : Allium, mitosis, meristem
Text : The roots of plants grow because new cells are produced by mitosis in the meristem. The tip of the root (lighter in color) is the root cap, which protects the root as it grows into the soil. The darker area near the center of the image is the meristem. To see the different stages of mitosis, click on the appropriate link below:
Prophase: The chromosomes become visible. (1000x)
Metaphase: The chromosomes form a line in the middle of the cell. (1000x)
Anaphase: The
spindle pulls the two groups of chromosomes to the opposite ends of the cell.
(1000x)
Telophase: The chromosomes reach the poles of the cell (bottom center of image). The very top left of the image shows a cell at the end of telophase, with the new cell wall separating the two daughter cells. (1000x)
Title : Whitefish blastula : mitosis Magnification : 100x Image : blastula.jpg
Text : The blastula is a round ball of cells that forms early in the development of an animal. It is produced by mitosis from the original fertilized egg. Each blastula consists of roughly 60 – 200 cells. Most of the cells are in interphase, but some are dividing by mitosis.
Metaphase: the chromosomes are lined up in the center of the spindle (1000x)
Anaphase: the chromosomes separated into two groups and pulled by the spindle to opposite ends of the cell (1000x)
Title : Monocot leaf Magnification : 100x Image : monoleaf.jpg
Keywords : vascular tissue, anthophyta
Text : The
veins (vascular tissue) in the leaf of a monocot are parallel. So a cross
section of the leaf shows a series of dark
circles, each of which is a separate vein. On the bottom surface of the leaf
two guard cells can be seen around each of the stomata. The white areas inside the leaf are air spaces, which allow the cells to
take up carbon dioxide gas for photosynthesis.
Title : Dicot leaf Magnification : 40x Image : dicotleaf.jpg
Text : This
image shows the large central vein (vascular tissue) in the
middle of a dicot leaf. The white areas inside the leaf are air spaces, which
allow the cells to take up carbon dioxide gas for photosynthesis. The rows of
elongated cells near the top surface of the leaf are the palisade layer, where
most of the photosynthesis takes place.
Title : Onion cells Magnification : 100x Image : onion100.jpg
Text : This shows a layer of onion (Allium) cells. The line dividing each cell is the cell wall, made of cellulose. Under high magnification the nucleus, which contains the DNA, can be seen.
Click here for higher magnification (400x)
Title : Elodea
Magnification : 40x
Image : elodea.jpg
Keywords : plant, cell, cell wall
Text : The
leaf of Elodea ( a water weed ) is show here. The dark line
dividing each cell is the cell wall, made of cellulose. Under high magnification
the chloroplasts, which are green, fill most of the cell.
Click on the image above for high magnification (400x)
Title : Oscillatoria
Magnification : 400x
Image : oscill400.jpg
Keywords : bacteria, colony, prokaryotic
Text : Oscillatoria
is a bacteria that forms long colonies. The cells join together to produce this
thin filament, seen here in black and white. Live Oscillatoria is green
and photosynthetic. Notice that each individual cell is very tiny. These are
prokaryotic cells, that lack a nucleus and lack organelles.
Click here for higher magnification (1000x)
