Biotic factors in the grasslands
1. birds 2.mice 3.deer 4.grass 5.bears
Abiotic factors in the grasslands
1.sun 2.water 3.air 4.soil 5.rocks
Carrying Capacity- largest # of individuals in one species
The resources needed for a species to survive are food, water, shelter, and space.
Changes over time of one species.
The population of deer could decrease if their was a flood and food was scarce. If there was a fire their shelter could be gone and have nowhere to hide from predators. If there was a decrease in the population of bear, than the deer population would most likely increase.
Limiting Factors- any factor or condition that limits the growth of a population
Some limiting factors are disease, trees burned, and water not available because of dams.
A bear can hunt a deer but if the deer aren't able to get water, they might die and the bear will not be able to hunt deer anymore.
Energy Roles- how the organism gets its food
Examples of an energy role is, a producer, or grass. A first level consumer would be a deer. A second level consumer would be a bear or owl.
The producer, or grass, gets its energy from the sun. The deer gets its energy from the grass. Finally, the bear gets is energy from the deer.
The importance of the producers is they are the main source of energy for every ecosystem.
Food webs and food chains
Food webs are more realistic than food chains because you can have more than one producer or main food source and you can also show more possibilities with the food webs.
If you removed the deer from the food web than that would decrease the population of the bear.
Trophic levels and energy pyramids.
A pyramid is better because it shows the amount of energy passed from one organism to another more organized.
Producers are in the biggest level because there are so many of them and the top predators are in the smallest level because there aren't as many of them.
CO2 + H2O -> C6H12O6 + O2
What is needed for photosynthesis?
What is needed for photosynthesis to occur is water, CO2, and sunlight. What is created during the process is oxygen and glucose.
Energy transfer during photosynthesis.
The energy goes from radiant energy to chemical energy to mechanical energy.
Tropism- turning or bending movement toward or away from an external stimulus
There are four types of tropisms
Ex. flower and a tree.
A flower would make my ecosystem survive by providing food for the deer and then the deer would be the food for the bear.
We need decomposers in our ecosystem because without them where would all the dead stuff go, it would just stay right there and never be useful. If there were no decomposers than there would be no nutrient soil for the producers then there would be no oxygen.
Types of decomposers
1.earth worm 2. fungi 3. maggot
The purpose of adaptations is so that the organism can reproduce for many generations. How adaptations help an organism survive is if a habitat all the sudden has a flood a animal could adapt and have webbed feet.
A frog has adapted to live in the grassland by changing the color of their skin over a long period of time to blend in, it also has webbed feet to swim in water to get food and survive. Certain types of plant grow thicker, broader, and wider leaves to get more sunlight.
If you put a frog in the dessert than it would, over time, not have webbed feet and change the color of the skin along with changing the diet.
Natural selection- inheritable traits become more common in a population over successive generations.
It is important because without natural selection a certain trait that would make the difference between life or death, the trait would be useless because would just go away and an organism would die.
An example of an organism that has been naturally selected is a Peppered Moth. The moth over many generations would change to a darker color in order to blend in with trees to survive and not be eaten by birds or other predators and the population would increase when the color changed. The cause of the change was the population of their predators increased or new predators came into the ecosystem and the moth was the main food item for the new predators.