Answers to Chapter 2 Section 2
1. What are some basic needs that organisms can meet through competition or
cooperation?
The basic needs are for food, shelter, space and places to raise your young.
2. Draw a predator and type of prey it eats. Describe some of the ways they interact.
Examples: Bird and a grasshopper, lion and gazelle. The predator hunts and eat
the prey. The prey tries to get away from the predator using different strategies.
3. Make a Venn Diagram using cooperation and competition.
Cooperation
Work together
Defend the group
Get Food
Same
Competition
Within Species Struggle between organisms
Within Ecosystem
4. Name and explain the three types of symbiosis.
Mutualism: both species benefit form the relationship
Commensalism: one species benefits while the other is not affected.
Parasitism: one species benefits while the other is harmed.
5. Could two partners in a symbiotic relationship be harmful to each other? Why
or why not?
No, because if both organisms harmed each other, they would be in
competition, not in a symbiotic relationship.
6. For each of the following pictures, label the type of symbiosis and briefly
describe the relationship.
Farmer and the Cow: Commensalism is the relationship where the farmer
benefits for the cow’s milk and the cow is unharmed.
Bee and the flower: Mutualism is the relationship where the bee gets the
food and the flower get pollen from other flowers to make seeds.
Dog and the tick: Parasitism is the relationship where the tick gets food from
the dog’s blood and the dog is harmed.