Question 1

Which of the following best describes the law of conservation of energy as it applies to biological systems?

Accepted Answer

Energy can be converted from one form to another, but cannot be created or destroyed.

Question 2

Which of the following is an example of potential energy in a biological context?

Accepted Answer

The chemical bonds in a glucose molecule.

Question 3

During photosynthesis, which molecules are produced in the light reactions and used in the Calvin cycle?

Accepted Answer

ATP and NADPH

Question 4

Which process directly converts solar energy into chemical energy in plants?

Accepted Answer

Light reactions of photosynthesis

Question 5

What is the final product of the Calvin cycle in photosynthesis?

Accepted Answer

Glucose (C$$_6H$_{12}O$_6)$$

Question 6

Which of the following statements about energy flow in ecosystems is correct?

Accepted Answer

Energy flows in one direction, from the sun to producers to consumers.

Question 7

Which equation correctly represents the overall process of photosynthesis?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 8

In the light reactions of photosynthesis, what is the role of chlorophyll pigments?

Accepted Answer

To absorb light energy and excite electrons.

Question 9

Which of the following best explains why energy is always lost as heat in biological systems?

Accepted Answer

Because some energy is always released as heat due to the random motion of atoms and molecules.

Question 10

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

Accepted Answer

Glucose

Question 11

A scientist measures the amount of ATP produced in the light reactions and finds it is lower than expected. Which process in the plant would be most directly affected?

Accepted Answer

The Calvin cycle's ability to synthesize glucose

Question 12

Which of the following best describes the role of ATP and NADPH in photosynthesis?

Accepted Answer

They are used in the Calvin cycle to build glucose molecules.

Question 13

If a plant is exposed to light but deprived of CO$$_2$$, which stage of photosynthesis will be directly inhibited?

Accepted Answer

Calvin cycle

Question 14

Which of the following is a correct sequence of energy flow in photosynthesis?

Accepted Answer

Light energy $$\rightarrow$$ chemical energy in ATP/NADPH $$\rightarrow$$ chemical energy in glucose

Question 15

Which of the following is a real-world consequence of the Calvin cycle in plants?

Accepted Answer

Production of glucose that stores energy for the plant and is consumed by other organisms.

Question 16

Which of the following statements about producers and consumers is correct?

Accepted Answer

Consumers obtain energy by eating producers or other consumers.

Question 17

Which molecule is split during the light reactions to provide electrons and release oxygen?

Accepted Answer

H$$_2O$$

Question 18

A plant cell is unable to produce NADPH during the light reactions. What is the most likely consequence?

Accepted Answer

The Calvin cycle cannot synthesize glucose effectively.

Question 19

Which of the following best explains why photosynthesis is essential for life on Earth?

Accepted Answer

It produces oxygen and organic molecules that serve as energy sources for most organisms.

Question 20

Which of the following is a multi-step process that connects the light reactions and the Calvin cycle in photosynthesis?

Accepted Answer

The energy stored in ATP and NADPH produced in the light reactions powers the synthesis of glucose in the Calvin cycle.

Energy and Life: Photosynthesis and Energy Flow in Biology

Study Guide - Practice Questions

Study Guide - Flashcards