Q: Which equation correctly represents the overall process of photosynthesis?

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

Question 1

Which organelle is the primary site of photosynthesis in plant cells?

Accepted Answer

Chloroplast

Question 2

When a photon is absorbed by a chlorophyll molecule, what happens to the energy of the photon?

Accepted Answer

It excites an electron to a higher energy state.

Question 3

Why do chloroplasts absorb photons during photosynthesis?

Accepted Answer

To excite electrons that drive the synthesis of ATP and NADPH.

Question 4

Which of the following correctly lists the inputs and outputs of the light reactions of photosynthesis?

Accepted Answer

Inputs: H$$_2O$$, light, ADP, NADP$$^+$$; Outputs: O$$_2$$, ATP, NADPH

Question 5

Where in the chloroplast do the light reactions take place?

Accepted Answer

Thylakoid membrane

Question 6

What is the primary role of ATP and NADPH produced during the light reactions?

Accepted Answer

They provide energy and reducing power for the Calvin cycle.

Question 7

Which of the following best describes the main difference between oxidative phosphorylation in mitochondria and photophosphorylation in chloroplasts?

Accepted Answer

Photophosphorylation uses light energy to generate ATP, while oxidative phosphorylation uses energy from electron transfer from food molecules.

Question 8

Which equation correctly represents the overall process of photosynthesis?

Accepted Answer

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

Question 9

During the Calvin cycle, which molecule acts as the primary carbon source for synthesizing glucose?

Accepted Answer

CO$$_2$$

Question 10

Which of the following best explains the major consequence of photorespiration in plants?

Accepted Answer

It decreases photosynthetic efficiency by consuming O$$_2$$ and releasing CO$$_2$$ without producing ATP or glucose.

Question 11

Which adaptation allows C$$_4$$ plants to minimize photorespiration in hot, dry environments?

Accepted Answer

They spatially separate carbon fixation and the Calvin cycle in different cell types.

Question 12

Which adaptation is characteristic of CAM plants that helps them survive in arid environments?

Accepted Answer

They fix CO$$_2 at $$night and store it as organic acids.

Question 13

Which of the following best describes the flow of energy and cycling of O$$_2$$ and CO$$_2$$ between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis converts light energy into chemical energy stored in glucose, releasing O$$_2$$; cellular respiration uses glucose and O$$_2 to $$produce ATP, releasing CO$$_2$$ and H$$_2O.$$

Question 14

In the electron transport chain (ETC) of the light reactions, what is the final electron acceptor?

Accepted Answer

NADP^+$

Question 15

A plant is exposed to a herbicide that blocks the production of NADPH in the light reactions. Which process would be directly affected?

Accepted Answer

The reduction of CO$$_2 in $$the Calvin cycle

Question 16

Which of the following is a similarity between oxidative phosphorylation and photophosphorylation?

Accepted Answer

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

Question 17

If a plant's thylakoid membranes were damaged, which process would be most directly impaired?

Accepted Answer

The light reactions

Question 18

Which of the following best explains why photorespiration is more likely to occur on hot, dry days?

Accepted Answer

Stomata close to conserve water, reducing CO$$_2$$ availability and increasing O$$_2$$ concentration inside the leaf.

Question 19

Which of the following is NOT an output of the light reactions of photosynthesis?

Accepted Answer

Glucose

Step-by-Step Guidance for Photosynthesis Study Questions

스터디 가이드 - 연습 문제

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