Question 1

Which of the following best describes the main function of the thylakoid membrane during 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, an increased concentration of $$\mathrm{H^+}$$ ions is generated in the thylakoid lumen. What is the primary source of these protons?

Accepted Answer

Splitting of water molecules by photosystem II and the movement of electrons through the electron transport chain.

Question 3

Which of the following correctly matches the plant tissue type with its primary function?

Accepted Answer

Vascular tissue – transport of water, minerals, and sugars

Question 4

A plant cell becomes flaccid after being placed in a hypertonic solution. Which process best explains this observation?

Accepted Answer

Osmotic pressure causing water to leave the cell

Question 5

Which of the following statements about xylem and phloem is correct?

Accepted Answer

Xylem transports water and minerals, and contains perforation plates; phloem transports sugars and contains sieve-tube plates.

Question 6

Which of the following best describes the pressure flow hypothesis for sugar transport in plants?

Accepted Answer

Sugars move from source to sink tissues due to osmotic pressure differences, creating bulk flow in the phloem.

Question 7

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 8

Which of the following best explains why the Casparian strip in the endodermis is critical for plant root function?

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 correct statement about the relationship between photosynthesis and cellular respiration?

Accepted Answer

The outputs of photosynthesis (glucose and $$\mathrm{O_2$}) $$are the inputs for cellular respiration, and vice versa.

Question 10

A population of frogs is being studied. The researchers note that the population is growing rapidly and resources are not limiting. Which equation best describes the population growth under these conditions?

Accepted Answer

$$\displaystyle \frac{dN}{dt} = rN$$

Question 11

Which of the following best defines an ecotype?

Accepted Answer

A genetically distinct population within a species that is adapted to specific environmental conditions.

Question 12

Which of the following is NOT a vital rate of a population?

Accepted Answer

Mutation

Question 13

Which of the following best describes the role of guard cells in plant leaves?

Accepted Answer

They regulate the opening and closing of stomata, controlling gas exchange and water loss.

Question 14

Which of the following is a correct statement about the logistic growth model?

Accepted Answer

The logistic term $$\displaystyle \frac{K-N}{K}$$ slows population growth as $$N$$ approaches $$K.$$

Question 15

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

Accepted Answer

Dispersal is the movement of individuals from their birthplace; dispersion is the pattern of spacing among individuals in a population.

Question 16

Which of the following is a real-world example of how organisms impact their environment?

Accepted Answer

A beaver building a dam, which alters water flow and creates new habitats.

Question 17

Which of the following best describes the symplastic pathway in plant roots?

Accepted Answer

Water and solutes move from cell to cell through plasmodesmata, crossing at least one plasma membrane.

Question 18

Which of the following is true about the phylogenetic relationships among major plant groups?

Accepted Answer

Nonvascular plants are a paraphyletic group.

Question 19

Which of the following best explains why secondary growth is important in plants?

Accepted Answer

It increases the girth of stems and roots, providing structural support and enabling the formation of wood.

Question 20

A scientist is studying two populations of the same plant species that grow in different environments. She grows both populations in a common garden and observes that they retain their distinct traits. What does this suggest?

Accepted Answer

The differences are due to genetic adaptation, indicating the presence of ecotypes.

Comprehensive Study Guidance for Biology 104 Exam 3 Topics

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