Question

BIOLOGY TEST HELP PLEASE HELP

Answer 1

1. Which of the following is true about ecology? (1 point)
Ecology is a philosophy that seeks to limit harm to the natural world.
Ecology is a practice that emphasizes preservation of life.
Ecology is an area of study that focuses on interactions in nature.
Ecology is a strategy for sustainable living.
2. Which of the following would be the best way for an ecologist to determine the effects of an industrial waste chemical on the survival of a fish species? (1 point)
conducting experimental work in a lab
conducting library research
constructing mathematical models on a computer
making observations in natural areas
3. How are populations, ecosystems, and communities related? (1 point)
A community consists of an ecosystem and its physical environment, and an ecosystem is made up of many different populations of organisms.
A population consists of a community of organisms and its physical environment, and a community is made up of many different ecosystems.
An ecosystem consists of a community of organisms and its physical environment, and a community is made up of many different populations of organisms.
An ecosystem consists of a population of organisms and its physical environment, and a population is made up of many different communities of organisms.
4. The algae at the beginning of the food chain in Figure 3–1 are



(1 point)
consumers.
decomposers.
producers.
chemotrophs.
5. Why are ecological pyramids shaped as pyramids? (1 point)
because there is a large decrease in the amount of energy or biomass as you move from one trophic level up to the next
because the movement of energy through the biosphere follows a path similar in shape to a pyramid
because decomposers form a wide base of support at the bottom of a food web similar to the base of a pyramid
because a pyramid represents a stable building form that is similar to the structure of a stable ecosystem
6. What is true of matter in ecosystems? (1 point)
Nonliving things are essential for carrying out the chemical transformation of certain elements so that living things can use them.
Living things can recycle elements within an ecosystem as long as decomposers are present.
Matter flows in a one-way direction with a 10% loss at each move up in trophic level.
Elements continuously cycle between the physical environment and living organisms.
7. Which of the following is a food chain in the food web shown in Figure 3–4?

(1 point)
tree, rabbit, hawk, snake
grass, grasshopper, snake, hawk
grass, caterpillar, robin, hawk
tree, deer, mountain lion, fox
8. Organisms need nutrients in order to (1 point)
utilize hydrogen and oxygen.
carry out essential life functions.
recycle chemical compounds.
carry out nitrogen fixation.
9. A praying mantis catches and eats a moth. Which of the following set of terms describes the praying mantis? (1 point)
omnivore, heterotroph, producer
producer, carnivore, autotroph
predator, herbivore, heterotroph
consumer, carnivore, predator
10. Which of the following has the least opportunity for recovery? (1 point)
a forest burned by fire caused by a lightning strike
a forest cut down by a logging company
a forest flooded for a week following heavy spring rains
a forest decimated by an avalanche
11. Which factors provide the basis for the differences observed in the major land biomes on Earth? (1 point)
average temperature and average precipitation
average windspeed and average oxygen levels
average day length and average night length
average organic content and average mineral content in soil
12. Which two biomes have moderate precipitation levels? (1 point)
desert and tundra
tropical rain forest and taiga
savanna and grassland
grassland and desert
13. Which marine ecosystem contains the fewest producers? (1 point)
intertidal zone
near shore zone
coral reef
open ocean
This item has been reviewed and is scheduled to be updated. All students will receive full credit for any response to the following.
14. Which of the following may be lost if a wetland area is made into a housing development? (1 point)
a location for shellfish breeding
a source of saltwater fish
an area that helps control flooding
a site for disposal of waste water
15. Which of the following do scientists think is responsible for climate change? (1 point)
nitrogen
smog
acid rain
carbon dioxide
16. The goals of biodiversity conservation include all of the following EXCEPT (1 point)
protecting individual species.
introducing exotic species into new environments.
preserving habitats and ecosystems.
making sure local people benefit from conservation efforts.
17. Humans can cause an ecosystem to collapse by (1 point)
collecting and chemically altering industrial waste to detoxify it.
reducing habitat fragmentation.
hunting a keystone species to extinction.
building shelter belts next to farm fields.
18. Explain how clearing forests by cutting and burning trees contributes to climate change. (1 point)
Weather patterns change as a result of changes in forest patterns, which lead to climate change.
Reducing the number of trees reduces the amount of shade, which leads to higher local temperatures.
Clearing forests leads to large areas of bare ground that absorb more light energy from the sun than forested areas.
Burning trees releases huge amounts of carbon dioxide, which is a greenhouse gas.

Answer 2

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