How do Organisms Compete and Survive
in an Ecosystem
Chapter 6, lesson 1, pgs. 178, 179
1. What do you think leads some kinds
of animals to care for their young, while others do not?
Instinct controls
animal behavior toward their young. Some animals, such as birds and mammals,
have an instinct to care for and protect their young. Others, such as most
fish, leave their young on their own.
2. How does a population relate to a
community?
A population refers to
all the organisms of one kind in a given place; a community is made up of
several populations living together and interacting.
3. Why do organisms compete?
Each organism must
meet its needs in order to survive, and sometimes there is not enough food,
water, shelter, or space for all the organisms that need it.
4. For which resources do plants
compete?
They compete for
space, water, sunlight, and nutrients in the soil.
5. What do organisms compete for in an
ecosystem?
They compete for food,
water, shelter, and space.
Symbiosis, pg. 180
6. Do organisms in a mutualistic
relationship compete with each other? Explain your answer.
No they do not
compete. Instead, they help each other meet their needs.
7. How is symbiosis different from
competition?
Symbiosis involves
working together, but competition is a struggle with others for limited
available resources.
8. What are the three different kinds
of symbiosis and their characteristics?
Mutualism – both organisms benefit
Commensalism – one organism benefits and the
other is not harmed.
Parasitism – one organism benefits and the other is harmed or
even killed.
9. How does symbiosis help organisms
survive?
It helps them meet their needs,
especially their need for food.
10.
Why
do many parasites eventually need a new host?
The parasites weaken or kill the hosts.
11.
Why
do viruses and bacteria spread easily in crowded places?
These parasites can easily find a new host (YOU) in a
crowded place.
Pg.
181 Main Idea and Details question
Give
examples of the three kinds of symbiosis.
Mutualism:
rhino and bird; ants and aphids
Commensalism: remoras and sharks;
barnacles and whales
Parasitism: bacteria and viruses that cause disease;
tapeworms and roundworms in animals; mistletoe on trees
Pg. 182, Predator –
Prey Relationships
12.
Should
people try to keep predator – prey relationships in balance?
Some people think it is a good idea to prevent populations
from dying out in certain areas, while others believe that nature should
achieve its own balance.
13.
How
can a change in the number of prey affect predators?
If the number of prey increases, predators can more easily meet
their needs for food, and more of them will be able to survive and reproduce.
If the number of prey decreases, predators must compete for food, and fewer
will survive.
14.
How
can a change in the number of predators affect the prey?
An increase in predators could wipe out the prey. A decrease
in predators could allow more prey to survive and reproduce, increasing their
numbers.
15.
How
do predators help prey?
Predators keep the prey population in balance so that the
prey population does not increase so much that all the food supply is eaten and
some individuals begin to starve.
Pg. 182, Main Idea and
Details Question
What symbiotic relationship is most like a predator – prey
relationship?
Parasitism is most like a
predator – prey relationship.
Pg.
183,
Complete the following:
1. A and B
2. write a paragraph using at least
four vocabulary terms
3. draw conclusions
4. skip 4
5. Identify three populations living
near you.
6. select best response