8th Grade Science Released Tests - Life2 - Food Chains and Webs; Photosynthesis

Which of these best describes a relationship shown by this African energy pyramid?
1. The lion is a predator of the giraffes.
2. The lion is the prey of the giraffes.
3. Giraffes are the prey of the trees.
4. Giraffes are predators of the lion.
What is the role of the Orca in this food chain?
1. Producer
2. First-order consumer
3. Second-order consumer
4. Third-order consumer
Organisms that absorb nutrients from dead plants and animals are called —
1. carnivores
2. decomposers
3. herbivores
4. producers
(2004) How are humans classified within a food chain?
1. Producers
2. Consumers
3. Decomposers
4. Manufacturers
(2003) According to this diagram, both of these fish —
1. eat bacteria
2. give off toxic wastes
3. take in minerals through their gills
4. get their energy from other animals
(2004) In this food web, which organism has the greatest number of food sources?
1. Snake
2. Hawk
3. Shrew
4. Mouse
Which of the organisms in a forest ecosystem is an example of a producer?
1. Squirrels
2. Oak trees
3. Black bears
4. Bacteria
In a food chain, the numbers of each type of population are usually in a relatively stable combination. A diagram of a food chain is shown above. If humans interfered by spraying an insecticide to kill the insects, what would be the next thing that would happen?
1. The number of hawks would increase.
2. The number of songbirds would decrease.
3. The number of grass plants would decrease.
4. The number of snakes would increase.
(2004) In the food web shown, which of the following consumers eats only producers?
1. Hawk
2. Owl
3. Fox
4. Mouse
Which concept is best illustrated by this diagram?
1. The exchange of CO2 and O2 in an ecosystem
2. The effect of limiting factors in a biome
3. Cycling of nutrients in a community
4. Environmental pressures on a population
Which gas do animals need to carry out life processes?
1. Oxygen
2. Carbon monoxide
3. Helium
4. Carbon dioxide
(2004) A plant’s green color is due to the presence of which organelle?
1. Chloroplast
2. Nucleus
3. Mitochondrion
4. Vacuole
(2004) Which of the following is produced as a result of photosynthesis?
1. Heat
2. Water
3. Oxygen
4. a mixture
(2003) Which of the following do typical plant cells have that typical animal cells do not?
1. Cytoplasm
2. Nuclei
3. Mitochondria
4. Chloroplasts
When plants undergo photosynthesis, they produce —
1. carbon dioxide
2. oxygen
3. hydrogen
4. nitrogen
The equation for photosynthesis is shown. Which of these is required to complete the equation for photosynthesis?
1. Carbon
2. Oxygen
3. Nitrogen
4. Hydrogen
(2003) Which of these processes helps extract energy from food?
1. Reproduction
2. Digestion
3. Excretion
4. Circulation
What process makes food for plants?
1. Reproduction
2. Photosynthesis
3. Respiration
4. Condensation
Chloroplasts are found only in organisms that are able to —
1. generate their own energy
2. grow to a larger size
3. migrate to other ecosystems
4. hunt for prey