Lesson 4.1

• Biologie
• Middelbare school
• vwo
• Leerjaar 4

Competition and symbiosis

A factor that would increase the size of the population

1. Emmigration
2. Death Rate higher than Birth Rate
3. Birth Rate Higher than Death Rate
4. Drought

A factor that is more likely to affect crowded population much more than spread out population

1. Density dependent factor
2. Limiting factor
3. Natural disaster
4. Density independent factor

A factor that decreases the population or keeps it from increasing

1. Limiting factor
2. Food surplus
3. High birth rate
4. Carrying capacity

Example of a density independent factor

1. Natural Disaster
2. Disease
3. Resource Availability/Competition
4. Predators

What is the carrying capacity of the following graph?

1. Around 500
2. More than 500
3. Less than 500
4. Around 600

02:27

All of the following statements concerning characteristics of predator-prey relationships are
correct EXCEPT:

1. A rise in the population of prey is often followed by a rise in the population of predators.
2. A rise in the population of predators is followed by a decrease in the population of prey.
3. The production of large numbers of offspring within very short periods of time ensures the survival of some prey populations.
4. The population of predators most often eliminates the population of prey.

03:29

Intra means within

Inter means between

Intraspecific competition

Interspecific competition

What does symbiosis mean?

1. living separately, no relationship between 2 species
2. living together, close relationship between 2 species
3. living in a community with no interaction between each other
4. living together in fear of each other

Ants and acacia trees have a mutualistic relationship because:

1. They both benefit from living with each other.
2. They are part of the same ecosystem.
3. They are both adapted to a humid climate.
4. The ants eat part of the acacia tree.

Which of the following symbiotic relationships is considered parasitic?

1. Bees transporting pollen from flowers
2. Pilot fish swimming under sharks
3. Birds eating the insects from the back of a hippopotamus
4. Tapeworm in an intestinal tract

Explain and define what type of relationship this is and give 2 examples of why it is that symbiotic relationship by discussing how each individual organism is directly
affected by the other organism. Provide another example of organisms sharing the same symbiotic relationship as the hummingbird and flower.

Homework

• Complete this lessonup
• Read pages 442-447 (and 457)
• Complete Worksheet Competition and Symbiosis on the Classroom