The Earth’s Atmosphere and Biological Processes

Question 1:

In which layer does all life exist?

a. Exosphere

b. Stratosphere

c. Mesosphere

d. Troposphere

Question 2:

As you travel from the surface up through the atmosphere in outer space, the gases or air pressure becomes

a. more dense/increases

b. less dense/decreases

c. Higher in temperature

d. Consistently lower in temperate

Question 3:

This gas is found in the stratosphere where it helps protect us from UV radiation.

a. Ozone

b. Oxygen

c. Nitrogen

d. Carbon dioxide

Question 4:

What is the most abundant gas in our atmosphere?

a. Oxygen

b. Hydrogen

c. Nitrogen

d. Water vapor

Question 5:

This vascular tissue carries water absorbed by the roots to the other parts of the plant.

a. Phloem

b. Xylem

Answer:

1. Troposphere

2. less dense/decreases

3. Ozone

4. Nitrogen

5. Xylem

The Earth's atmosphere is a complex system that supports various biological processes essential for life. The different layers of the atmosphere play unique roles in sustaining life on Earth.

The troposphere is the layer where all life exists. It is the lowest layer of the atmosphere and is where weather events occur. This layer is crucial for the survival of plants, animals, and humans as it contains the necessary gases for respiration and photosynthesis.

As you travel upwards through the atmosphere, the gases or air pressure become less dense and decreases. This change in density affects various atmospheric phenomena and climate patterns.

The ozone gas found in the stratosphere plays a vital role in protecting us from harmful UV radiation. Ozone absorbs UV radiation, preventing it from reaching the Earth's surface and causing harm to living organisms.

Nitrogen is the most abundant gas in our atmosphere, making up around 78% of the air we breathe. This gas is essential for plant growth and various biological processes.

Xylem is a vascular tissue in plants that carries water absorbed by the roots to other parts of the plant. This transportation of water is crucial for the survival and growth of plants.