9. Photosynthesis

Which two events primarily trigger the breakdown of pigments, causing leaves to change color each fall?

Which of the following best describes the enhanced greenhouse effect?

Why is it necessary for six molecules of CO$_2$ to enter the chloroplast during photosynthesis?

Why is it difficult to determine the optimal concentration of CO$_2$ for photosynthesis when light intensity is very low?

Which of the following provides the energy needed for photosynthesis?

How does carbon dioxide enter the leaf during photosynthesis?

Which of the following is the second major stage of photosynthesis that involves the incorporation of atmospheric CO$_2$ into organic molecules?

Where do plants primarily obtain the energy required for photosynthesis?

Photosynthesis occurs inside which organelle?

In which organelle does photosynthesis primarily take place in plant cells?

How do plants obtain the carbon dioxide ($\mathrm{CO_2}$) required for photosynthesis?

Of the visible light spectrum, the rate of photosynthesis is greatest under which color light?

In the process of photosynthesis, where do the electrons required to initiate Photosystem II originate?

Which of the following best describes photosynthesis?

Radiation from the sun provides ______ for the water cycle.