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BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition
STARR
Publisher: CENGAGE L
ISBN: 9781305967359

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BuyFindarrow_forward

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition
STARR
Publisher: CENGAGE L
ISBN: 9781305967359
Chapter 6, Problem 8SA
Textbook Problem
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In the light-dependent reactions, what accumulates in the thylakoid compartment of chloroplasts?

a. sugars b. hydrogen ions c. O 2 d. CO 2

Summary Introduction

Introduction:

Photosynthesis is an essential metabolic pathway that is responsible for the conversion of carbon dioxide and water into the carbohydrates and molecules of oxygen. Photosynthesis is not done in a single step rather it is a two-stage reaction. The reactions that are involved in photosynthesis pathway are light-dependent reactions and light-independent reactions.

Explanation of Solution

Reason for correct answer:

Option b. is given as “hydrogen ions.”

In photosystem II, a water molecule splits into hydrogen ions and oxygen atoms. This breakdown takes place by light energy and the process is called photolysis. After the photolysis, hydrogen ions get accumulated in the thylakoid compartments to form ATP molecules and oxygen atoms combine to form oxygen gas.

Reason for incorrect answer:

Option a. is given as, “sugars.”

Sugars are the product of the Calvin-Benson cycle that includes light-independent reactions. So, in the light-dependent reactions sugars cannot accumulate in the thylakoid compartment. Hence, option a. is incorrect.

Option c. is given as, “O2.”

After the photolysis, hydrogen ions get accumulated in the thylakoid compartments and oxygen atoms combine to form oxygen gas

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