Experimental Design
Controlled variables / CONSTANTS
Which organism would be considered a primary producer?
Grasses
What is a producer?
Producers are living things that create their own food.
What are the two main factors that influence a biome?
Temperature and Precipitation
Which graph shows an exploitative or predatory/prey relationship?
Graph A
Part of the experiment that is intentionally changed by the researcher
Independent variable
What organisms would be considered the tertiary consumer or apex predator
Hawk
What do we call organisms that eat producers?
Consumers
VOCAB: An organisms role in the environment
Niche
Which graph shows Interspecific competition?
Graph C
Part of the experiment that is measured in response to the changed variable
Dependent variable
What do the arrows represent in a food chain/web? (2 things)
The arrows show the MOVEMENT OF ENERGY & MATTER between organisms.
FROM PYRAMID
The trophic level occupied by plants.
First
The process to make organic compounds in habitats that DO NOT have access to the sun.
What is chemosynthesis.
Graph B
Control
An organism that could be called a secondary consumer.
Toad or snake or hawk
FROM PYRAMID: On what level of the pyramid would you find a secondary consumer?
Level 3
Pioneer species in primary succession
Lichen
What does the pink dashed line on graph B represent?
Carrying capacity
Best way to improve an experiment?
MORE DATA!
More trials...more treatments...etc.
What organism is missing from the food web?
Decomposers
Which level of the pyramid has the most energy stored?
1
How were worms a basis for the food chain at a deep sea event?
contained chemosynthetic bacteria.
What causes the leveling off of the population in Graph B?
Limiting factors