12. primary succession occurs—
a. after a forest fire
c. in a stable ecosystem
b. on bare rock with no soil
d. in grasslands
13. pioneer species are important because they—
a. eat all other species
c. help create conditions for other organisms
b. destroy soil
d. stop succession
14. limiting factors—
a. increase population size
c. control population growth
b. have no effect on populations
d. only affect plants
15. carrying capacity refers to—
a. maximum speed of growth
c. largest population an area can support
b. number of predators
d. energy in an ecosystem
16. biomass energy comes from—
a. rocks
c. living or once - living materials
b. nuclear reactions
d. air
17. geothermal energy comes from—
a. the sun
c. ocean waves
b. earth’s internal heat
d. wind
18. nuclear energy is produced by—
a. burning coal
c. splitting atoms
b. chemical reactions
d. photosynthesis
19. energy conservation means—
a. producing more energy
c. storing all energy
b. using energy wisely
d. wasting energy
20. competition occurs when organisms—
a. share energy
c. need the same limited resources
b. fight for territory only
d. help each other
21. predation benefits—
a. both predator and prey
c. predator only
b. prey only
d. neither organism
22. symbiosis is a relationship where—
a. both organisms compete
c. one organism dies
b. organisms live closely together
d. only plants interact
23. mutualism is a relationship where—
a. one benefits, one is harmed
c. neither is affected
b. both organisms benefit
d. one hunts the other
24. parasitism involves—
a. both organisms benefiting
c. no interaction
b. one benefiting and one being harmed
d. both being harmed

Question

Accepted Answer

### Question 12
# Brief Explanations:
Primary succession starts on bare rock or other areas with no soil (e.g., after a glacier retreats). A forest fire leads to secondary succession (soil remains). Stable ecosystems have no succession, and grasslands are established ecosystems. So primary succession occurs on bare rock with no soil.
# Answer:
B. On bare rock with no soil

### Question 13
# Brief Explanations:
Pioneer species (like lichens) break down rock, add organic matter, and create soil/conditions for other organisms. They don’t eat all species, destroy soil, or stop succession.
# Answer:
C. Help create conditions for other organisms

### Question 14
# Brief Explanations:
Limiting factors (e.g., food, space) control population growth by restricting how large a population can get. They don’t increase population size, have no effect, or only affect plants.
# Answer:
C. Control population growth

### Question 15
# Brief Explanations:
Carrying capacity is the maximum population size an environment can sustainably support. It’s not growth speed, number of predators, or ecosystem energy.
# Answer:
C. Largest population an area can support

### Question 16
# Brief Explanations:
Biomass energy comes from living or once - living materials (plants, animals, waste). Rocks, nuclear reactions, and air don’t provide biomass energy.
# Answer:
C. Living or once - living materials

### Question 17
# Brief Explanations:
Geothermal energy is heat from Earth’s interior (from radioactive decay and residual heat). The Sun, ocean waves, and wind are sources of other energy types (solar, tidal, wind).
# Answer:
B. Earth’s internal heat

### Question 18
# Brief Explanations:
Nuclear energy is produced by splitting atoms (fission) or fusing them (fusion). Burning coal is for fossil fuel energy, chemical reactions for chemical energy, and photosynthesis for biological energy.
# Answer:
C. Splitting atoms

### Question 19
# Brief Explanations:
Energy conservation means using energy wisely (reducing waste, using efficient methods). It’s not producing more, storing all, or wasting energy.
# Answer:
B. Using energy wisely

### Question 20
# Brief Explanations:
Competition happens when organisms need the same limited resources (food, space, mates). They don’t share energy, fight only for territory, or help each other.
# Answer:
C. Need the same limited resources

### Question 21
# Brief Explanations:
Predation benefits the predator (gets food) and can benefit the prey population by controlling its size (preventing overpopulation and promoting healthy genes). So it benefits both.
# Answer:
A. Both predator and prey

### Question 22
# Brief Explanations:
Symbiosis is a close, long - term relationship between different species. Organisms live closely together. It’s not just competition, one organism dying, or only plants interacting.
# Answer:
B. Organisms live closely together

### Question 23
# Brief Explanations:
Mutualism is a symbiotic relationship where both organisms benefit (e.g., bees and flowers). One benefiting and one harmed is parasitism, neither affected is commensalism (or neutral), and one hunting the other is predation.
# Answer:
B. Both organisms benefit

### Question 24
# Brief Explanations:
Parasitism is a relationship where one organism (parasite) benefits and the other (host) is harmed (e.g., ticks on dogs). Both benefiting is mutualism, no interaction is not parasitism, and both harmed is not a typical symbiotic relationship.
# Answer:
B. One benefiting and one being harmed

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Question 12

Answer:

Question 13