Q: What is the overall summary equation for photosynthesis?

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + \text{light energy} \rightarrow C_6H_{12}O_6$ + 6\ \mathrm{O}_2$$

Question 1

Which of the following statements best distinguishes autotrophs from heterotrophs?

Accepted Answer

Autotrophs use light or inorganic chemicals as an energy source, while heterotrophs rely on organic molecules produced by other organisms.

Question 2

What is the overall summary equation for photosynthesis?

Accepted Answer

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + 	ext{light energy} ightarrow C_6H_{12}O_6$ + 6\ \mathrm{O}_2$$

Question 3

Which part of the plant is primarily responsible for gas exchange during photosynthesis?

Accepted Answer

Stomata

Question 4

Why do leaves appear green to the human eye?

Accepted Answer

Chlorophyll reflects green wavelengths and absorbs red and blue.

Question 5

Which wavelengths of light are most effective in driving photosynthesis?

Accepted Answer

Red (about 660 nm) and blue (about 450 nm)

Question 6

What is the main function of the light reactions in photosynthesis?

Accepted Answer

To convert solar energy into chemical energy in the form of ATP and NADPH

Question 7

During the light reactions, what is the source of electrons for the electron transport chain?

Accepted Answer

Water ($$\mathrm{H}_2\mathrm{O})$$

Question 8

Which of the following best describes the role of rubisco in the Calvin Cycle?

Accepted Answer

It catalyzes the fixation of carbon dioxide to ribulose bisphosphate (RuBP).

Question 9

How does chemiosmosis in chloroplasts differ from chemiosmosis in mitochondria?

Accepted Answer

In chloroplasts, protons are pumped from the stroma into the thylakoid space; in mitochondria, protons are pumped from the matrix into the intermembrane space.

Question 10

Which of the following is NOT a product of the light reactions of photosynthesis?

Accepted Answer

Glucose

Question 11

What is the role of NADP$$^+ in $$the light reactions?

Accepted Answer

It acts as the final electron acceptor, becoming reduced to NADPH.

Question 12

Which of the following best explains why leaves change color in the fall?

Accepted Answer

Chlorophyll pigments degrade, revealing carotenoids that absorb different wavelengths.

Question 13

Which of the following is required for the Calvin Cycle to proceed?

Accepted Answer

ATP and NADPH

Question 14

How many turns of the Calvin Cycle are required to produce one molecule of glucose ($$C_6H_{12}O_6$)?

Accepted Answer

Six

Question 15

Which of the following statements about the absorption spectra of chlorophyll a, chlorophyll b, and carotenoids is correct?

Accepted Answer

Chlorophyll a and b absorb mainly blue and red light, while carotenoids absorb mainly blue and reflect orange/yellow.

Question 16

Which process occurs in the stroma of the chloroplast?

Accepted Answer

Calvin Cycle

Question 17

A plant is exposed only to green light. What will happen to its rate of photosynthesis?

Accepted Answer

It will decrease because green light is mostly reflected, not absorbed.

Question 18

Which of the following best describes the flow of electrons during the light reactions of photosynthesis?

Accepted Answer

Water $$\rightarrow$$ Photosystem II $$\rightarrow$$ Photosystem I $$\rightarrow$$ NADP^+$

Question 19

Which of the following is a similarity between chemiosmosis in mitochondria and chloroplasts?

Accepted Answer

Both use a proton gradient to drive ATP synthesis via ATP synthase.

Question 20

Which of the following is true regarding the anabolic nature of photosynthesis?

Accepted Answer

Photosynthesis builds complex organic molecules from simpler ones, storing energy in chemical bonds.

Chapter 10: Photosynthesis-REVIEW

Study Guide - Practice Questions

Study Guide - Flashcards