Question 1

What is the function of the Casparian strip?

Accepted Answer

The Casparian strip is a band of suberin (a fatty substance) that surrounds the endodermal cells of plant roots. This strip regulates the flow of water and minerals into the xylem, preventing the uncontrolled flow of ions and other substances into the plant. This is important for maintaining the chemical balance within the plant and preventing toxic substances from entering.

Question 2

This plant is a dioecious perennial.The part eaten is the aerial stem.Of the following choices,this plant would likely be a(n)

Accepted Answer

Asparagus is the only plant among the choices that is a dioecious perennial and has an edible aerial stem. Radish, lettuce, carrot, and turnip are all annual or biennial plants, and their edible parts are typically roots or leaves.

Question 3

The Michigan lily has multiple leaves surrounding the stem.This leaf arrangement is termed ________.

Accepted Answer

The Michigan lily has multiple leaves arranged in a circular pattern around the stem, which is characteristic of a whorled leaf arrangement.

Question 4

Which of the following root tissues gives rise to lateral root branches?

Accepted Answer

The pericycle is a layer of cells located just inside the endodermis and it is the tissue responsible for initiating lateral root formation.

Question 5

The formation of secondary xylem is due to the activities of which of the following?

Accepted Answer

Secondary xylem is formed by the activities of the vascular cambium, which is a lateral meristem located between the primary xylem and phloem in vascular plants. The vascular cambium produces secondary xylem and secondary phloem, resulting in an increase in girth or thickness of the stem or root.

Question 6

In a mature tree,the cortex has been completely replaced by the ________.

Accepted Answer

The cortex is the outermost layer of the stem, and in a mature tree, it is typically replaced by the periderm. The periderm is a protective tissue that grows to replace the epidermis and cortex in woody stems. It consists of cork cells, cork cambium, and sometimes phelloderm, and it helps to protect the stem from environmental stressors such as drought, temperature changes, and insect damage. The secondary phloem and xylem both grow inward from the cambium layer, but they do not replace the cortex. The vascular rays are structures that run perpendicular to the growth rings in the xylem, and they help to transport nutrients and water horizontally across the stem. The epidermis is the outermost layer of the stem in herbaceous plants, but it is typically replaced by the periderm in woody stems.

Question 7

Which of the following is not a correct association?

Accepted Answer

Sclerenchyma is not associated with photosynthesis or storage, but rather with providing support and protection to the plant.

Question 8

Most photosynthesis takes place in the ________ of a typical leaf.

Accepted Answer

The palisade mesophyll is located in the upper part of the leaf and contains the majority of chloroplasts used for photosynthesis. The spongy mesophyll also plays a role in photosynthesis, but to a lesser extent. The epidermis and guard cells are primarily responsible for regulating gas exchange and water movement. The vascular bundles transport water, minerals, and sugars throughout the plant.

Question 9

Looking at a cross section of a plant stem under a microscope,you see a clearly defined pith in the middle of the stem and vascular bundles in a ring surrounding the pith.You conclude that this plant is likely which of the following?

Accepted Answer

Herbaceous dicots typically have a stem structure with a central pith and vascular bundles arranged in a ring, which matches the description given.

Question 10

In the roots of herbaceous dicots,where is the phloem found?

Accepted Answer

In herbaceous dicot roots, the phloem is located between the "cross-like arms" of the xylem, forming a distinct arrangement.

Question 11

Trees with roots submerged in water,like cypress trees,are able to take in oxygen thanks to which of the following?

Accepted Answer

Trees with roots submerged in water are able to take in oxygen through specialized roots called pneumatophores, which are also known as "air roots" or "breathing roots." These roots grow vertically upwards out of the water and into the air, allowing the tree to exchange gases and survive in waterlogged conditions. Aerial roots, prop roots, contractile roots, and deep tap roots do not have the same function as pneumatophores in this context.

Question 12

When a botanist speaks of wood,she is really speaking of the ________.

Accepted Answer

When a botanist speaks of wood, she is referring to the secondary xylem, which is the tissue responsible for giving trees their strength and support.

Question 13

On what tissue would you find the Casparian strip?

Accepted Answer

The Casparian strip is a water-impermeable layer found in the endodermis of plant roots. It helps regulate the movement of water and nutrients into the plant.

Question 14

This plant is biennial and is important for the production of vitamin A.The part eaten is the tap root.This plant could be which of the following?

Accepted Answer

Carrots are biennial plants that are a good source of vitamin A. The edible part of the carrot is the tap root. Radishes and lettuce are annuals, and asparagus is a perennial, so they do not fit the description given.

Question 15

Which of the following choices is not a zone of the root tip?

Accepted Answer

The vascular cylinder, also known as the stele, is not part of the root tip. It is located further up in the root, closer to the stem. The zones of the root tip include the apical meristem, zone of elongation, zone of maturation, and zone of cell division.

Question 16

Which of the following would you not find in mature secondary xylem?

Accepted Answer

Cortex is typically found in primary plant tissue, which includes the epidermis and cortex of roots and stems. Once secondary growth occurs, the primary tissues are replaced by secondary tissues such as secondary xylem (wood) and secondary phloem. Thus, mature secondary xylem would not have cortex.

Question 17

You are viewing a cross section of a plant structure.There is a pith in the middle of the plant structure surrounded by xylem and phloem,which in turn are surrounded by an endodermis.You are most likely looking at which of the following?

Accepted Answer

The answer of You are viewing a cross section of...

Question 18

Which of the following structures is found in an herbaceous dicot root but not in a monocot root?

Accepted Answer

The pericycle is a structure found in herbaceous dicot roots but not in monocot roots. The epidermis, endodermis, and cortex are all present in both types of roots.

Question 19

The appearance of annual rings in wood is created by which of the following?

Accepted Answer

Annual rings in wood are created by the difference in size between springwood cells and summerwood cells. Springwood cells are larger and have thinner walls, while summerwood cells are smaller and have thicker walls. This difference creates a visible band or ring when the wood is cut and viewed under a microscope.

Question 20

The leaves of corn (Zea mays)exhibit parallel venation.Corn is classified as which of the following?

Accepted Answer

Monocots are characterized by parallel venation in their leaves. Corn (Zea mays) is a monocot plant, so it exhibits parallel venation in its leaves.

Quiz 3: The Plant Body