What is that

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What is that?

• Life Science
• 7th Grade

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Dichotomous Keys

• Dichotomous
• forking
• two choices
• Choose your own adventure
• You must be very observant
• Can be simple or complex

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Eastern Woodland Mammals
Nenature.com
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Dichotomous Keys for Eastern Woodland Mammals
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Leaves

• Job
• Produce sugars for the plant using
  photosynthesis.
• Distinguishing Characteristics

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Types of Trees
Deciduousbroad-leafed, lose leaves in fall.
ConiferousNeedles, Evergreen, seed in cones
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Needles
Bundles
Scale Like
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Deciduous Leaf Shape
Many leaflets splitting from a single leaf stem.
One leaf per leaf stem
Many leaflets that split from a central point on
the leaf stem
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Arrangement on Stem
Leaflets branch from opposite sides of the stem
Leaflets branch from left then right side of the
stem in an alternating pattern.
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Leaf Veins
Veins branch from a central location.
Veins run in the same direction
Veins branch from a central vein that runs the
length of the leaf.
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Leaf Base

• V shaped
• the leaf is V shaped where it meets the leaf
  stalk.
• Rounded
• the leaf is rounded and smooth where it meets the
  leaf stalk.
• Flat
• the bottom of the leaf is flat where it meets the
  leaf stalk.
• Heart shaped
• the bottom of the leaf has two large even lobes
  that meet at the leaf stalk.
• Uneven
• the bottom of the leaf does not meet in the same
  spot on the leaf stalk.

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Leaf Edge

• Smooth
• Edge is smooth, there are no jagged teeth.
• Saw Tooth
• Edge has small jagged teeth that look like a saw
  blade
• Double Saw Tooth
• The edge of the leaf has big jagged teeth that
  have smaller teeth around the edge.
• Lobed
• The edge of the leaf has large sections that
  stick out but the edges are smooth

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Citation

• www.nenature.com
• www.cws-scf.ec.gc.ca
• Hot Science and Technology Life Science