Q: Which of the following best describes the overall chemical equation for photosynthesis in plants?

$$6\ \text{CO}_2 + 6\ \text{H}_2\text{O} + \text{light energy} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\ \text{O}_2$$

Question 1

Which of the following best describes the overall chemical equation for photosynthesis in plants?

Accepted Answer

$$6\ 	ext{CO}_2 + 6\ 	ext{H}_2	ext{O} + 	ext{light energy} ightarrow 	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6\ 	ext{O}_2$$

Question 2

What is the primary function of the light-capturing reactions in photosynthesis?

Accepted Answer

To produce ATP and NADPH using energy from sunlight

Question 3

Which pigment is most responsible for the green color of plants and algae?

Accepted Answer

Chlorophyll

Question 4

Why do carotenoids appear yellow, orange, or red in leaves?

Accepted Answer

They reflect and transmit yellow, orange, and red wavelengths of light

Question 5

Which part of the chlorophyll molecule is responsible for absorbing light?

Accepted Answer

The head, which is a large ring structure with a magnesium atom in the center

Question 6

What is the main role of accessory pigments like carotenoids in photosynthesis?

Accepted Answer

To extend the range of wavelengths that can drive photosynthesis and protect chlorophylls from damage

Question 7

What happens when a chlorophyll molecule absorbs a photon of red light?

Accepted Answer

An electron is bumped up one energy level

Question 8

Which process is responsible for the production of oxygen during photosynthesis?

Accepted Answer

The splitting of water by photosystem II

Question 9

What is the function of the electron transport chain (ETC) in the thylakoid membrane?

Accepted Answer

To create a proton gradient that drives ATP synthesis via ATP synthase

Question 10

Which molecule acts as the final electron acceptor in photosystem I?

Accepted Answer

NADP+

Question 11

What is the Z scheme in photosynthesis?

Accepted Answer

A model describing how photosystems II and I interact to maximize energy production

Question 12

Which of the following best explains the enhancement effect observed in photosynthesis?

Accepted Answer

Photosynthesis is more efficient when both 680-nm and 700-nm wavelengths are available, allowing both photosystems to operate at maximum rates

Question 13

During cyclic photophosphorylation, what is the main product?

Accepted Answer

ATP

Question 14

Which pigment absorbs blue and green light and transmits yellow, orange, or red light?

Accepted Answer

Carotenoids

Question 15

What is the primary purpose of the antenna complex in a photosystem?

Accepted Answer

To gather light energy and transfer it to the reaction center

Question 16

Which of the following is NOT a function of carotenoids in photosynthesis?

Accepted Answer

Directly fixing carbon dioxide

Question 17

Which process in photosynthesis is analogous to the electron transport chain in mitochondria?

Accepted Answer

The thylakoid electron transport chain

Question 18

What is the main difference between oxygenic and anoxygenic photosynthesis?

Accepted Answer

Oxygenic photosynthesis produces oxygen by splitting water, while anoxygenic photosynthesis does not produce oxygen and uses different electron donors

Question 19

Which molecule shuttles electrons from photosystem II to the cytochrome complex in the thylakoid membrane?

Accepted Answer

Plastoquinone (PQ)

Question 20

In the context of photosynthesis, what is photophosphorylation?

Accepted Answer

The synthesis of ATP using energy from light

Chapter 10: Photosynthesis – Mechanisms and Significance

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