Question 1

Which of the following statements best explains why not all photoautotrophs are classified as green plants?

Accepted Answer

Some photoautotrophs, such as certain bacteria and algae, do not share the same common ancestor as green plants.

Question 2

A botanist discovers a plant with the following characteristics: flower parts in multiples of three, parallel leaf veins, scattered vascular bundles in the stem, and a fibrous root system. Which group does this plant most likely belong to?

Accepted Answer

Monocots

Question 3

Which adaptation was most critical for early land plants to prevent desiccation?

Accepted Answer

Development of a cuticle

Question 4

In the haplodiplontic life cycle of land plants, which process directly produces the multicellular sporophyte?

Accepted Answer

Mitotic division of the zygote

Question 5

Which of the following best describes the evolutionary advantage of seeds in seed plants?

Accepted Answer

Seeds protect the embryo, provide a food supply, aid in dispersal, and allow for dormancy.

Question 6

A plant is observed to have secondary growth, annual growth rings, and bark. Which tissue is responsible for producing the secondary xylem and phloem in this plant?

Accepted Answer

Vascular cambium

Question 7

Which of the following is a function of the Casparian strip in plant roots?

Accepted Answer

It forces water and solutes to pass through the plasma membrane of endodermal cells, regulating entry into the vascular stele.

Question 8

A plant is exposed to high temperatures (above 34°C) and low soil moisture. Which hormone is most likely to be involved in the plant's response, and what effect will it have?

Accepted Answer

Abscisic acid (ABA) will promote stomatal closing to reduce water loss.

Question 9

Which of the following best explains why water moves from the soil into the roots and up through the plant?

Accepted Answer

Water moves from regions of higher water potential to regions of lower water potential, following the gradient from soil to leaves.

Question 10

A student cuts a branch from a tall tree and notices that the leaves above the cut wilt quickly. Which phenomenon is most likely responsible for this observation?

Accepted Answer

Cavitation, which introduces air bubbles that break the column of water in the xylem.

Question 11

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

Accepted Answer

Sclerenchyma: rigid support due to thick, lignified secondary cell walls

Question 12

Which pathway allows water to move through the non-living portions of the plant root, such as cell walls, before being forced through the endodermis?

Accepted Answer

Apoplastic pathway

Question 13

A plant's phloem is actively transporting sucrose from the leaves to developing fruits. According to the pressure flow hypothesis, which of the following best describes the process?

Accepted Answer

Active transport of sucrose into sieve tubes at the source lowers water potential, causing water to enter by osmosis and generate turgor pressure that drives flow toward the sink.

Question 14

Which of the following is a distinguishing feature of eudicot roots compared to monocot roots?

Accepted Answer

Primary xylem is located at the center of the stele in eudicots.

Question 15

Which of the following equations correctly represents water potential ($$\Psi) in $$plant cells?

Accepted Answer

$$\Psi = P + S$$

Question 16

A plant is observed to have a ring of vascular bundles in its stem, a taproot system, and leaves with net-like veins. Which of the following is most likely true about this plant?

Accepted Answer

It is a eudicot.

Question 17

Which of the following best explains why tracheophytes can grow larger than bryophytes?

Accepted Answer

Tracheophytes have vascular tissues (xylem and phloem) that allow efficient transport of water and nutrients.

Question 18

Which of the following statements about stomata is correct?

Accepted Answer

Stomata open when guard cells accumulate ions, decreasing water potential and causing water to enter by osmosis.

Question 19

A plant is classified as perennial. What does this indicate about its life span?

Accepted Answer

It lives and grows for more than two years, often flowering and fruiting multiple times.

Question 20

Which of the following is a real-world consequence of cavitation in tall trees?

Accepted Answer

Cavitation can block water transport in xylem, leading to wilting or death of branches above the blockage.

Green Plant Phylogeny, Anatomy, and Transport Systems

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