Name an organism that may be placed at level A

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Presentation transcript:

Name an organism that may be placed at level A Which statement about the pyramid of energy shown here is correct? (1) The amount of energy needed to sustain the pyramid enters at level D. (2) The total amount of energy decreases with each successive feeding level from D to A. (3) The amount of energy is identical in each level of the pyramid. (4) The total amount of energy at level D is less than the total amount of energy at level B. Name an organism that may be placed at level A (1) Heterotrophs (2) Omnivores (3) A maple tree (4) A lion

Populations

How do populations grow?

The basics of population growth: Populations grow if more are born than die. Populations are at equilibrium (stable) if birth rates = death rates Populations shrink if more die than are born.

Do growth conditions remain good forever? If conditions are right (enough food, space, etc.), a population will grow. Do growth conditions remain good forever?

NO! WHY?

The maximum number of a population that can live in a given ecosystem.

The graph shows the changes in the size of a fish population over a period of time. The dashed line on the graph represents the (1) carrying capacity of the environment (2) life span of the species (3) level at which extinction is reached (4) level of maximum biodiversity of the species

Are predators bad?

Predators are important… They must also survive

Predators are important… They must also survive They remove weak and sick animals from prey population (natural selection!)

Predators are important… They must also survive They remove weak and sick animals from prey population (natural selection!) Keep prey from overpopulating

The graph shows changes in the populations of two species that interact only with each other over a period of time. Which statement best describes these two species? Species A is a producer and species B is its consumer. (2) Species A is a host and species B is its parasite. (3) Species A is a predator and species B is its prey. (4) Species A is a scavenger and species B is its decomposer.