Unit 2 Flashcards
What is a population?
A population is many of the same species living in an area together.
What is a community?
A community is many different populations (different species) living in an area together.
What is an ecosystem?
An ecosystem includes the community and all of the non-living physical features such as water and soil.
What causes a population to increase in size?
Unlimited access to resources (food or spaces), lack of predators, immigration or increased birth rate.
What causes a population to decrease in size?
Increase of predators, limited access to resources (food or space), emigration or increased death rate, disease, natural disasters, (flood or fire)
What is a habitat?
The specific environment where an organism lives
What is the difference between biotic and abiotic factors?
Abiotic factors are non living and biotic factors are or were once living
What is a niche?
The role an organism plays in a community
What are the different biomes and their characteristics?
Desert (driest with large ranges in temperature between day and night)
Temperate forest (has precipitation spread evenly throughout the year and experiences seasonal changes)
Tropical rain forest (has year-round warm temperatures and lots of rain)
Aquatic (freshwater or marine-in bodies of water)
Tundra (occurs in high latitudes with cold and dry climate)
Taiga (in between temperate forests and tundra)
Savanna (tropical and dry, grasslands)
What is the difference between gestation and generation time?
Gestation time is how long it takes for a embryo or fetus to be born (pregnancy time) and generation time is how long until an individual is able to reproduce themselves (age)
How does age distribution in a population affect a species?
Depending on the generation time, the age of the population could affect the birth rate, if a population only has really young or really old members, the birth rate could fall and the population could decrease in size.
What is carrying capacity and how can you identify it on a graph?
The largest population that can be supported and sustained by and in a specific environment
on a graph, look for where the population levels off)
What can affect the carrying capacity of a population?
Number of predator or prey, availability or resources, competition, weather and natural disasters.
What are the three types of survivorship curves?
Type 1 - organisms that usually give birth to one offspring at a time
Type 2 - organisms that have a 50/50 shot of survival
Type 3 - organisms that are likely to be eaten as eggs
What is a keystone species?
An organism that plays a large role in it’s community and if removed would affect the community structure significantly
How might an organism adapt to its environment to keep from being eaten?
Camouflage, conceal itself from a predator by blending in with the environment
What are the ways species can interact with each other?
Herbivory - animal eats plants
Predation - animal kills and eats other animals
Competition - when animals of the same or different species use the same resources
Mutualism - when two species interact and they both benefit
Commensalism - when two species interact, one benefits and the other is unaffected
Parasitism - when two species interact, one benefits and the other is harmed
On a food web, what do the arrows show?
Where the energy is going, the arrows should point to what is eating
What is the difference between producers and consumers?
Producers make their own food (photosynthesis or chemosynthesis) and consumers rely on other organisms for their energy
How do you identify what trophic level an animals is in a food web?
A primary consumer eats a producer. A secondary consumer eats a primary consumer. A tertiary consumer eats a secondary consumer. Count how far away from the producer.
What is the difference between carnivores, omnivores, and herbivores?
Carnivores - eat meat
Herbivores - eat plants
Omnivores - eat both
What is a decomposer?
Decomposers and detritivores break down or consume dead material to make it usable for the producers again.
What is the difference between biodiversity and a monoculture?
Biodiversity means there is a variety of plant and animal species in an area, monoculture means there is one single plant species growing in an area (often found in agriculture)
How do we measure biodiversity?
Species richness (the number of different species present) and species evenness (the relative abundance of different species - how the number of individuals of different species compares to each other)
