Climate Change Unit

Which statement below best summarizes the overall purpose of the light-dependent reactions?

The light-dependent reactions capture the energy from the sun and transfer it to high-energy molecules.

How does climate change affect earth's oceans?

The pH level of the ocean will shift to a more acidic environment, leading to stress and the possible extinction of many species of shellfish and corals.

What do all greenhouse gases have in common?

They have complex structures that allow them to contribute to the greenhouse effect by trapping heat energy.

A product of photosynthesis, ________ is a carbon-based molecule that is the chief source of energy for most organisms.

glucose

Over the past several decades, the overall trend for earth's temperatures has been

increases in overall global temperatures at an accelerating rate, a phenomenon known as global warming.

Because fossil fuels are the remains of once living organisms, they contain reservoirs of ________ that are released into the atmosphere when they are burned.

carbon

Which of the following is the most likely cause for the sudden sharp increase in atmospheric carbon dioxide levels?

human activities, including the use of fossil fuels, changes in agricultural practices, and deforestation

The greenhouse effect

is caused by gases such as carbon dioxide trapping heat in the earth's atmosphere.

Which of the following are greenhouse gases?

methane and carbon dioxide

Carbon sinks are reservoirs that hold large amounts of carbon. Which of the following are considered to be carbon sinks?

oceans, fossil fuels deep underground, and the atmosphere

Which of the following acts as a carbon source within the carbon cycle?

respiration from human and animals

As global temperatures increase, which of the following scenarios is most likely to happen?

Glaciers and snow coverage decrease.

How do greenhouse gases cause climate warming?

Greenhouse gases prevent radiation of infrared energy back into space, trapping the heat near the earth's surface and causing the climate to warm.

Climate can best be described as

the average weather patterns in a given area over long periods of time.

The light reactions of photosynthesis occur within the ________ of the chloroplast and the Calvin cycle reactions occur within the ________ of the chloroplast.

thylakoid; stroma