Food Webs
What is one reason that Humans/Animals need food?
To Help Brain Function, To have strong Bones and Muscles, or to have energy to do activities.
What food would a bird with sharp talons and a sharp beak eat?
meat and fish
What three types of factors that could cause populations to change?
Abiotic factors, Biotic factors, and human actions
Population
a group of individuals of the same species that live in the same area and reproduce with each other.
Why are producers found at the beginning of the food chain/web?
producers are found at the beginning of the food chain/web because they get their energy from the sun. They do not rely on other organisms for food.
Which function of a plant best helps it reproduce?
Cacti stores water to survive in a desert.
Milkweed seeds are feathery and float in the wind.
Milkweed seeds are feathery and float in the wind.
Which of these factors would cause a population of animals to decrease in size?
One animal gets injured and can not reproduce
A school is built where there was an open field
A school is built where there was an open field
Abiotic factors
What happens when the organism at the bottom of the food web (a producer) disappears?
all other organisms are affected
What ways do plants scatter their seeds?
the wind carries their seeds, helicopter seeds, animals eat seeds that they can not digest.
The human population in area is increasing. In the same area, the bird population is decreasing.
Which question is better to ask to determine if humans are affecting the bird population?
Are humans hunting the bird?
Are the birds not laying eggs?
Are humans hunting the bird?
ecosystem
a community of interacting organisms and their environment.
Green plants are the producer in the food web. Grasshoppers eat green plants. Spiders eat grasshoppers.
What would happen to the grasshopper population if spiders disappeared?
The grasshopper population would increase.
How do plants reproduce?
They scatter their seeds around an ecosystem.
What is one negative impact that invasive species can have an ecosystem?
Invasive species can over-eat another organism, they can outcompete another organism by eating that organism's food.
Solar Energy
What is the primary source of energy in most habitats?
Solar energy (The Sun)
What are the functions of the special structures that organisms have?
They help organisms survive, eat, and reproduce.
Humans overhunt fish in an ecosystem. What are two ways that humans could affect animals besides fish in that ecosystem?
They could cause populations of the animals that eat fish to decline by removing the amount of food they have available. They could cause the populations of organisms eaten by fish to increase because they no longer have as many predators.
Biodiversity
a large variety of animals living in an ecosystem