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Transcript
Biodiversity

The variety of life in an area that is
determined by the number of different
species in that area

Increases the stability of an ecosystem
and contributes to the health of the
biosphere
Why is it important?

Biodiversity maintains a healthy
biosphere and provides direct and
indirect value to humans

There are economic, aesthetic, and
scientific reasons for preserving
biodiversity
Critical Thinking Question

Why is preserving biodiversity
important for the human food supply?

80% of human food supply comes
from 20 kinds of plants. But humans
use 40,000 species for food, clothing
and shelter. Biodiversity provides for
variety of foods for the planet.
Another question

Why is it important to maintain
biodiversity for medical reasons?

Drugs developed from an extract from
Madagascar periwinkle is used to treat
childhood forms of leukemia
Promoting Biodiversity
Biodiversity Extra Credit Project

Can replace any 4th marking period grade (Lab
Report, Evolution Packet, Labs, Quizzes, etc)

Research one way to promote biodiversity in a
particular ecosystem, and give a 2 minute
presentation to the class in either the form of a
poster, PowerPoint, or essay. You may quote
sources, but you MUST reference them!

Project presentations will be given on Thursday,
June 9th
Do Now:

Work on the Final Exam Review
Packet. This is not an assignment
grade, but it will help you do well
on the final exam (worth 10% of
your grade!!!)

Use your notes, your textbook,
and work with each other!
Pay special attention to the
following questions in the
review packet:

1, 3, 4, 7, 9, 11, 15, 19, 24, 25,
26, 34, 36, 37, 39, 40, 42, 49,
53, 54, 55, 56, 61, 62, 63, 64,
65.
Review Question #1

How would the biodiversity of an
ecosystem become affected if 25% of
the herbivores die off?
Review Question #2

2 spotted cheetahs produce a litter of 4
cubs. 2 cubs are spotted, and 2 are
solid black. Which fur type is dominant,
and which is recessive?
Review Question #3

materials and energy can transfer from
one organism to another through the
food chain.
Review Question #4
Comparisons of DNA sequences
showed that the DNA of modern
caecilians and salamanders are
most similar to each other.
Review Question #5
Types of Natural Selection:
 Directional- ex: Pepper moth

Direction selection is when gene variation shift
in a particular direction in response to a change
in the environment