| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.51 |
| Score | 0% | 70% |
The hottest of Earth's atmospheric layers is which of the following?
mesosphere |
|
troposphere |
|
thermosphere |
|
stratosphere |
Temperatures again increase with altitude in the thermosphere which is the hottest (4,530 °F / 2,500 °C) atmospheric layer due to direct exposure to the Sun's radiation. However, the gas in this layer is highly diluted so even though the atoms of gas may be very high in temperature, there are too few of them to effectively transfer much heat.
The ozone layer is in which of Earth's atmospheric layers?
thermosphere |
|
mesosphere |
|
stratosphere |
|
troposphere |
The stratosphere is just above the troposphere and is stratified in temperature with warmer layers higher and cooler layers closer to Earth. This increase in temperature is a result of absorption of the Sun's radiation by the ozone layer.
In cell biology, where does DNA replication take place?
Golgi apparatus |
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mitochondria |
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nucleus |
|
cytoplasm |
The cell nucleus contains the genetic material of the cell and is where DNA replication takes place.
During digestion, the kidneys filter substances from the blood. Which of the following is not filtered by the kidneys?
fats |
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water |
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minerals |
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salt |
Chemical waste like excess water, minerals, and salt are filtered from the blood by the kidneys and secreted into the urine. Urine is transported from the kidneys to the bladder through ureters.
In the food chain, consumers are classified as which of the following?
secondary |
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all of these |
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tertiary |
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primary |
Most animals consume other organisms to survive. Consumers (heterotrophs) are divided into three types, primary, secondary, and tertiary, based on their place in the food chain.