A researcher conducted an experiment to investigate the interactions b

Praxis 5005 Practice Test

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Question 1 of 5.

A researcher conducted an experiment to investigate the interactions between a certain plant and its environment. The researcher placed the plant in a sealed container, placed the container and the plant next to a light source, and monitored the levels of oxygen and carbon dioxide gases inside the container. At the beginning of each day, the researcher opened the container to allow air to enter the container. The researcher recorded the following observations. 1. The plant needed to be watered daily. 2. The mass of the soil did not change over two months. 3. The amount of carbon dioxide decreased daily. 4. The amount of oxygen increased daily. Which of the following statements is best supported by the researcher's observations?

A. The plant relied on the soil as a source of food.

B. The plant absorbed more oxygen than it released.

C. The plant carried out photosynthesis.

D. The plant converted water into carbon dioxide gas.

Explanation: CO2 down O2 up light, photosynthesis. Soil mass same not food. O2 released more. Water to oxygen not CO2. Light reaction.

Question 2 of 5.

The rotation of Earth around its axis is responsible for which of the following?

A. The force of gravity

B. The day and night cycle

C. The temperature differences between seasons

D. The movement of continents relative to one another

Explanation: Rotation day night. Gravity mass. Seasons tilt orbit. Continents drift. 24 hour cycle.

Question 3 of 5.

Which TIIREE of the following agricultural practices are most likely to have a negative impact on the environment?

A. Increasing the amount of fertilizer applied to a field to maximize crop yields

B. Providing a field with excessive amounts of water to maintain ground saturation

C. Applying nonselective herbicides to a field at the end of the growing season to eliminate weeds

D. Planting crops in a field with minimal disturbance of the surface soil to reduce soil erosion

Explanation: Fertilizer excess runoff pollution. Water excess waste salinization. Herbicides nonselective kill beneficial. No till positive. Negative practices harm. D positive conservation.

Question 4 of 5.

Which TWO of the following are powered most directly by the Sun's energy?

A. Surface currents in the ocean

B. Volcanic eruptions

C. Tectonic plate movements

D. Convection in the atmosphere

Explanation: Sun heats water winds currents convection. Volcanoes geothermal. Plates internal heat. Solar drive weather ocean.

Question 5 of 5.

Natural gas-fired power plants are considered greenhouse gas emitters because the burning of natural gas produces which of the following?

A. Hydrogen

B. Radon

C. Carbon dioxide

D. Helium

Explanation: Combustion CO2. Hydrogen fuel. Radon radioactive. Helium inert. Methane burn CO2.