Question 1

Which of the following best describes the main function of the thylakoid membrane in photosynthesis?

Accepted Answer

It houses the electron transport chain and photosystems, enabling the light reactions to generate ATP and NADPH.

Question 2

During the light reactions of photosynthesis, what is the immediate source of electrons for the electron transport chain?

Accepted Answer

Water (H$$_2O)$$

Question 3

Which of the following correctly matches the location and main process of the Calvin cycle?

Accepted Answer

Stroma; carbon fixation

Question 4

How does the increased concentration of H$$^+$$ ions in the thylakoid lumen contribute to ATP synthesis during photosynthesis?

Accepted Answer

It creates a proton gradient that drives ATP synthase to convert ADP and inorganic phosphate into ATP.

Question 5

Which of the following statements best explains the relationship between photosynthesis and cellular respiration in the biosphere?

Accepted Answer

Photosynthesis produces oxygen and glucose, which are used as inputs for cellular respiration; cellular respiration produces carbon dioxide and water, which are used as inputs for photosynthesis.

Question 6

Which plant tissue type is primarily responsible for transporting water and minerals from roots to shoots, and what is a key structural feature of this tissue?

Accepted Answer

Xylem; perforation plates

Question 7

A plant cell becomes flaccid when placed in a hypertonic solution. What is the significance of turgidity for non-woody plants?

Accepted Answer

Turgidity allows non-woody plants to maintain structural support and stand upright.

Question 8

Which of the following best describes the function of the Casparian strip in plant roots?

Accepted Answer

It forces water and dissolved substances to pass through the plasma membranes of endodermal cells, regulating entry into the vascular cylinder.

Question 9

Which of the following is a key difference between xylem and phloem?

Accepted Answer

Xylem is composed of dead cells at maturity and transports water; phloem is composed of living cells and transports sugars.

Question 10

Which meristem is responsible for secondary growth in woody plants, and what is the main result of this growth?

Accepted Answer

Vascular cambium; increase in stem and root girth (thickness)

Question 11

Which of the following plant groups is monophyletic, and what does this imply about their evolutionary history?

Accepted Answer

Seed plants; they all share a single common ancestor and include all descendants of that ancestor.

Question 12

Which of the following plant innovations evolved independently in both lycophytes and seed plants, and what is its significance?

Accepted Answer

Wood (secondary xylem); enabled large plant size and significant impact on the carbon cycle

Question 13

Which of the following best describes the pressure flow hypothesis for phloem transport?

Accepted Answer

Sugars move from source to sink tissues due to bulk flow driven by pressure differences created by active loading and unloading of sugars.

Question 14

Which of the following is an example of convergent evolution in plants?

Accepted Answer

The independent evolution of wood in lycophytes and seed plants.

Question 15

Which of the following best defines an ecotype, and how might a common garden experiment help identify ecotypes?

Accepted Answer

A genetically distinct population adapted to local environmental conditions; a common garden experiment reveals persistent differences among populations when grown in the same environment.

Question 16

Which of the following is NOT one of the four vital rates of a population?

Accepted Answer

Mutation

Question 17

A population of frogs is observed to have a Type III survivorship curve. Which of the following best describes their life history strategy?

Accepted Answer

High mortality early in life, with few individuals surviving to adulthood.

Question 18

Which equation correctly represents the logistic growth term that modifies exponential growth?

Accepted Answer

$$\frac{K-N}{K}$$

Question 19

Which of the following best distinguishes between dispersal and dispersion in population ecology?

Accepted Answer

Dispersal is the movement of individuals from their birthplace to new locations; dispersion is the pattern of spacing among individuals within a population.

Question 20

At which scale of ecology do human activities become a critical area of focus, and why?

Accepted Answer

At the ecosystem and global scales, because human activities can alter nutrient cycles, climate, and biodiversity across large regions.

Comprehensive Study Guidance for Biology 104 Exam 3 Topics

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