BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
3rd Edition
ISBN: 9781260670929
Author: Hoefnagels
Publisher: MCG CUSTOM
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Chapter 5, Problem 1MCQ

Where does the energy come from to drive photosynthesis?

a. A chloroplast
b. ATP
c. The sun
d. Glucose
Expert Solution & Answer
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Summary Introduction

Introduction:

The photosynthesis is required by the plant to harvest the light energy from the sunlight and convert the atmospheric carbon dioxide into a usable form of carbohydrates. The carbohydrate synthesized by the plant is glucose that is stored in the form of starch.

Answer to Problem 1MCQ

Correct answer:

The energy derived for initiating the process of photosynthesis is from Sun. Hence, the correct answer is option c.

Explanation of Solution

Reason for correct answer:

Option c. is given as,“The sun.”

The sun provides energy-rich particles called photons that excite the electrons present in the photosystem complex of the chloroplast. The excited electron initiates various mechanisms that give the end product as glucose. Hence, option c. is correct.

Reason for incorrect answer:

Option a. is given as, “A chloroplast.”

The chloroplast is the organelle that is present exclusively in plant cells and functions as the site for photosynthesis. Thus, it is the site for photosynthesis and not the source for energy for the process. Hence, option a. is incorrect.

Option b. is given as,“ATP.”

ATP stands for adenosine triphosphate. This is an energy-rich molecule that is used in the light-independent or dark reactions along with NADPH to form glucose. Therefore it does not initiate photosynthesis. Hence, option b. is incorrect.

Option d. is given as, “Glucose.”

Glucose is the end product of photosynthesis. The plant body uses it after transportation for various metabolic reactions; however, it does not provide energy for the process of photosynthesis. Hence, option d. is incorrect.

Hence, the options a., b., and d. are incorrect.

Conclusion

The energy from the sun provides photons that excite the electron that leads to activation of various mechanisms and complexes involved in the process of photosynthesis, causing the formation of glucose. Thus, the correct answer is option c.

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