Transcript Interactions PowerPoint

Interactions among living things
~Roaches have been around since before dinosaurs.
~The brain of a cockroach is inside its body.
~If a roach loses its head it can still live for over a week,
eventually dying because it can not eat.
~Breath through little holes on each body segment
~Cold Blooded- require much less food
~Last one full month without food
~Last two full weeks without water
~Female mates once, pregnant for life,
lays 150 eggs per year
~Can hold breath for 40 minutes
~Run 3 miles per hour
~Eat anything including plants and other insects
~Live in dark, warm, wet places
~Carry millions of bacteria and other germs on body
~Shed skins weekly and secrete oils that are allergens causing
allergic reactions.
~Cell growth is minimal
Why would a cockroach survive
nuclear Explosion?
Questions to Answer
1. How do an organisms adaptations
help it to survive?
2. What are the major types of
interactions among organisms?
3. What are the three forms of
symbiotic relationships?
4. A walking stick is an insect that
resembles a twig. How do you think
this insect avoids predators?
5. How are parasitism and predation
similar? How are they different?
Adapting to the
Environment
In response to
their environment
species evolve.
Change over time.
How have our bodies changed
http://humanorigins.si.edu/humancharacteristics/bodies
The changes that make organisms better
suited to their environments develop
through a process called
Natural Selection
Individuals in a population have different
characteristics. Those individuals whose
characteristics are best suited for their
environment tend to survive and produce
offspring. Offspring that inherit the
characteristics that made their parents
successful also live to reproduce. Over many
generations individuals with those
characteristics continue to reproduce.
On the other hand…..
Over time these poorly suited characteristics
may disappear from the population because
they are not being reproduced.
Adaptations: behaviors and physical
characteristics of species that allow them to live
successfully in their environment.
Choose 8 words from our vocabulary list and
Illustrate one in each box. Write its definition.
under its box.
Every organism has a variety of adaptations that
are suited to its specific living conditions.
~ An organism’s particular
role, or hot it makes living,
is called it niche.
~ A niche includes the
type of food the organism
eats, how it obtains this
food, other species that
use it for food, how the
organism reproduces and
the physical conditions it
requires to survive.
Organisms niche include how it interacts with
other organisms.
There are three major types of interactions
among organisms:
Competition
Predation
Symbiosis
competition
Competition is the struggle between organisms
to survive in a habitat with limited resources.
Read page E33
Click on the link below:
search Animal competition
http://www.bing.com/
Find an example: explain and illustrate
Predation
Predation is an interaction in which one organism kills
and eats another.
Read pages 34E – E35
Click on the link below
Search:
Predator/Prey
Predator Adaptations
Prey adaptations
http://www.bing.com/
Find an example of each: explain and illustrate
Predation and Population Size
Predators have a major
effect on the size of a
population.
Read page E 36
Click on the link below
http://www.bing.com/
Search: Effect of predator population growth
Find a graph, explain and illustrate its meaning