21 questions
All these are examples of a chemical change EXCEPT....
Rusting metal
Boiling water
Burning paper
Rotting food.
When an electric current passes through the wire filament inside a light bulb, the wire filament shines with a bright light and becomes very hot. When the current stos, the wire filament dims and cools. Which of the following is the BEST evidence that these changes are physical properties of the wire filament?
The changes produce light.
The changes are easily reversed.
The changes are produced by electricity.
The changes result in the release of heat.
Which of the figures is in the nervous system?
Figure #1
Figure #2
Figure #3
Figure #4
Which of the following situations contributes to the sustainability of an ecosystem
A. Increase in biodiversity
B. Decrease in biodiversity
C. Extinction of a population from the ecosystem
D. Removal of many populations of organisms
Complete this statement. The more diverse an ecosystem is ----
A. the more threatened its populations are
B. the more similar the species will be
C. the more stable it is
D. the few varieties of species are present
Refer to the food web. If the grasses in each ecosystem are attacked and killed by a disease, which ecosystem will most likely survive?
A. The prairie ecosystem, because few organisms eat grass.
B. The tundra ecosystem, because there is a variety of producers.
C. The prairie ecosystem, because there a fewer top predators.
D. The tundra ecosystem, because it has more herbivores.
What sort of evidence would support at least one of the components of the cell theory?
Rocks and other nonliving things are not composed of cells.
Cells are observed converting one form of energy into another.
A microscope is necessary to make observations of nearly all cells.
The origin of all cells observed can be traced to previous cells.
What would be true if the rabbit population increased?
The bacteria population will decrease
The hawk population would increase
There may be increases in wolves, hawks, and snakes.
Grasshopper populations would increase
Which abiotic factor(s) do plants compete for in order to make their own food?
water ONLY
sunlight ONLY
wind ONLY
water AND sunlight
Which relationship is true according to the food web?
Phytoplankton prey on crayfish
Flamingos are predators of crayfish
Shrimp get nutrients from zooplankton
Shrimp have three predators.
How does biodiversity help an ecosystem?
There are many types of foods if one becomes unavailable
Organisms can move around a lot
Organisms eating food will die and more will eat the food
Trees grow taller to compete for -
soil
air
sunlight
good temperature range