Question

Directions: Read carefully each item. Use a separate sheet for your answers. Write only the letter of the best answer
1 An cosystem thrives with biotic and abiotic component parts. An example of an abiotio part of an ecosystem is
a. micro-bacteria b. fungus
minerals
d. decaying plants
2. An algal bloom formed
a from a lack of nutrients in the water.
b. from a dead zone.
c from an excessive growth of algae, killing many other aquatio organisms
d. all of the above.
3. Soil
a. is the foundation of terrestrial ecosystems. b. is essentially a nonrenewable resource,
c. takes hundreds of millions of years to form.
d. all of the above.
4. The atmosphere is important, as it
a. refills the oceans with freshwater
b. provides organisms with gases needed for life.
c. contains oxygen for photosynthesis and carbon dioxide for cellular respiration
d. all of the above
5. Which of the following may threaten the world's grasslands?
a. Invasive species b. Unchecked development c. Climate change d. All of the above
5. What are the main conditions that determine the plant life of a given biome?
a. rainfall and temperature
b. rainfall and sunlight
c. sunlight and temperature
d. altitude and temperature
6. During a long period when there is no rainfall, a mountain lion may temporarily leave its usual hunting territory to
drink from a farm pond. This behavior is probably due to
a. Its need to find different foods to eat
b. The change in an abiotic factor in its environment
c. Its need to find a new habitat
d. The change in a biotic factor in its environment
7. All of the following are the effects of the excessive use of inorganic fertilizer EXCEPT
a. make the soil fertile
b. make soil acidic thus plants are not healthy
c. kill the helpful microorganisms
d. hasten eutrophication (algal blooms)
8. Natural disasters, such as earthquakes, volcanoes, and forest fires, are also abiotic factors that certainly have drastic
effects on the ecosystems. How does forest fires affects the ecosystem?
a. loss of habitats b. death of wildlife c. air pollution
d. all of the above
9. Pollution is changing our
which is the biggest factor affecting biotic diversity.
a. water b. climate
d. soil
10. A leaf from each of two plants (X and Y) was tested for the presence of starch using iodine solution.
Leaf from plant X turns blue/black Leaf from plant Y turns pale brown colour
Plant X had been growing in the light before testing. Plant Y had been taken from the light and placed in the dark for 48
hours before the test. What abiotic factor affect the result?
a. amount of water b. amount of light c. type of soil
d. all of the above
o, air​

Answer 1

Explanation:

no.1. it will be number 1

Answer 2

Answer:

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