Science 10 points

deforestation affects which of the following?

question 1 options:

water cycle only

carbon cycle only

water cycle and carbon cycle

none of the cycles

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question 2 (1 point) question 2 unsaved
paving a large parking lot could interrupt or hurt which of the following?

question 2 options:

water cycle

carbon cycle

cellular respiration

the krebs cycle

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question 3 (1 point) question 3 unsaved
acid rain is caused by which of the following?

question 3 options:

nitrogen compounds in the soil

nitrogen compounds in the air

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question 4 (1 point) question 4 unsaved
the enrichment of nutrients in an aquatic environment that causes excessive growth of aquatic plants which increases bacterial growth and consumption of oxygen, resulting in depletion of oxygen in the environment is known as:

question 4 options:

eutrophication

acid rain

deforestation

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question 5 (1 point) question 5 unsaved
excess nitrogen can enter the nitrogen cycle via: fertilizers on farmers fields, sewage waste treatment plants and car exhaust.

question 5 options:
true
false

1. water and carbon cycle

2. carbon cycle

3. nitrogen compounds in the air

4. eutrophication

5. True

Explanation:

Deforestation is the outright removal of forest layers and conversion of such land to other uses. Forest layers serve as sinks for carbon and also as filters for water running off to streams and seas. Hence, removal of forests affects both carbon and water cycles.

Paving a large parking lot involves covering the soil surface with asphalt, concrete or any other materials. Soil contains millions of aerobic organisms that assist in decomposition of organic matters. Covering up the soil surface will limit the activities of these organisms and negatively affect organic matter decomposition which happens to be a major step in carbon cycle.

Acid rain occur when acidic oxides present in the atmosphere dissolve in rainwater to produce a weak acid. The acidic oxides include, oxides of sulphur, nitrogen, etc.

Eutrophication is the enrichment of water bodies by nutrients such as phosphorus and nitrogen. The enrichment causes a bloom of photosynthetic aquatic organisms and microbes. These blooms lead to high oxygen consumption from the water bodies which can eventually lead to the depletion of oxygen.

Excess nitrogen can enter the nitrogen cycle via fertilizer usage by farmers, sewage treatment plants and exhaust of vehicles. Fertilizers are rich in nitrogen (NPK) and those that are not used by crops enters the nitrogen cycle through the soil. Treated sewage also represents a rich source of nitrogen and when released into the environment, then enter the nitrogen cycle through the soil or water. Smokes emanating from vehicles contain oxides of nitrogen and these enters into the nitrogen cycle through the air.

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

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