Question 1

The bundle sheath typically surrounds the larger veins.
____________________

Accepted Answer

This statement is true. The bundle sheath cells of C4 plants typically surround the larger veins in leaves.

Question 2

Modified leaves that protect meristematic tissue at the tips of woody plants are known as:
A) bulbs.
B) bud scales.
C) spines.
D) tendrils.
E) scale scars.

Accepted Answer

Bud scales are modified leaves that protect the meristematic tissue at the tips of woody plants. They cover the buds during dormancy and help prevent damage from cold temperatures and other environmental stressors.

Question 3

Compare the leaf structure of monocots and eudicots.

Accepted Answer

The answer of Compare the leaf structure of monocots and...

Question 4

Subsidiary cells are the only epidermal cells that have chloroplasts.
____________________

Accepted Answer

Guard cells

Question 5

A cross section of a monocot leaf typically shows veins in both cross-section and lengthwise section.
____________________

Accepted Answer

eudicot

Question 6

Identify and describe:
A.
three different ways in which leaves can be arranged on stems, and list one example for each.
B.
three different venation patterns in leaves and whether each is characteristic of eudicots or monocots.

Accepted Answer

The answer of Identify and describe:
A.
three different ways in which...

Question 7

Underground stems with fleshy leaves used for storage of water and food are known as:
A) tendrils.
B) spines.
C) bulbs.
D) buds.
E) stipules.

Accepted Answer

Underground stems with fleshy leaves used for storage of water and food are known as bulbs. Tendrils are thread-like structures used for supporting climbing plants, spines are modified leaves or stems used for protection, buds are undeveloped shoots on a stem, and stipules are small, leaf-like structures at the base of a leaf.

Question 8

Leaf abscission is initiated and orchestrated by changing levels of the plant hormone __________.
A) ethylene
B) cytokinin
C) auxin
D) abscisic acid
E) gibberellin

Accepted Answer

Leaf abscission is initiated and orchestrated by changing levels of the plant hormone ethylene. Ethylene is produced in response to various environmental stimuli such as drought, flooding, and changes in temperatures. It leads to the activation of enzymes, which break down cell walls at the abscission zone, allowing the leaf to detach from the plant.

Question 9

An alternate leaf arrangement is one in which there is one leaf per node.
____________________

Accepted Answer

An alternate leaf arrangement is also known as alternate phyllotaxy, and it is characterized by one leaf per node. The other common leaf arrangement is opposite phyllotaxy, which is characterized by two leaves per node.

Question 10

In cactus plants, the__________ is the main organ of photosynthesis.
A) leaf
B) spine
C) stem
D) flower
E) fruit

Accepted Answer

The answer of In cactus plants, the__________ is the main...

Question 11

Palisade mesophyll is a tissue typically found on the side of the leaf toward the upper epidermis.

Accepted Answer

Palisade mesophyll is indeed a tissue found on the upper side of the leaf, toward the upper epidermis. It is responsible for photosynthesis, and consists of tightly packed, vertically oriented cells that are rich in chloroplasts.

Question 12

Parallel venation is characteristic of eudicot leaves.
____________________

Accepted Answer

Netted

Question 13

The spines of a cactus are actually modified:
A) branches.
B) stems.
C) leaves.
D) roots.
E) trichomes.

Accepted Answer

Cactus spines are modified leaves, adapted over time to reduce water loss and protect the plant from herbivores.

Question 14

Insectivorous plants: A) typically grow in nutrient-rich soil. B) enhance a poor supply of CO₂ through capturing prey. C) use modified leaves to trap their prey. D) require symbiotic insects and insect larvae to digest their prey. E) require microorganisms to digest their prey.

Accepted Answer

Insectivorous plants have modified leaves, such as pitcher plants or Venus fly traps, that are used to trap their prey. They are adapted to live in nutrient-poor areas and rely on capturing prey to supplement their diet. They do not require symbiotic insects or microorganisms to digest their prey.

Question 15

Leaf abscission:
A) occurs as a response to increased temperatures.
B) occurs as a response to dry conditions.
C) involves the formation of a tendril at the base of the petiole.
D) occurs year-round on deciduous plants.
E) does not occur in conifers.

Accepted Answer

Leaf abscission is a process where leaves detach from a plant, often as a response to environmental stress such as dry conditions, to conserve water.

Question 16

Identify three different types of modified leaves and list the function of each.

Accepted Answer

The answer of Identify three different types of modified leaves...

Question 17

The release of liquid water by leaves when soil moisture is high is known as:
A) vaporization.
B) photosynthesis.
C) guttation.
D) transpiration.
E) abscission.

Accepted Answer

Guttation is the release of liquid water by leaves when soil moisture is high, often seen as droplets on the tips of leaves in the morning. Vaporization refers to the conversion of liquid water into water vapor, typically through evaporation. Photosynthesis is the process by which plants convert sunlight, water, and carbon dioxide into energy-rich organic compounds. Transpiration is the process by which plants release water vapor into the air through tiny pores on their leaves. Abscission is the shedding of leaves, flowers, or fruits from a plant.

Question 18

A leaf without a blade is said to be sessile.
____________________

Accepted Answer

petiole

Question 19

Which of the following is not associated with leaf abscission?
A) Chlorophyll breaks down.
B) Anthocyanins accumulate.
C) A layer of cork develops.
D) The middle lamella is strengthened.
E) Carotenoids become visible.

Accepted Answer

The middle lamella is not strengthened during leaf abscission; instead, it is broken down to allow the leaf to detach from the plant.

Question 20

The area where the petiole detaches from the stem is referred to as the:
A) abscission zone.
B) middle lamella.
C) bundle sheath extension.
D) terminal bud.
E) bud scale scar.

Accepted Answer

The area where the petiole detaches from the stem is known as the abscission zone. This is the area where the separation layer of cells is located, which eventually leads to the detachment of the leaf from the stem.

Quiz 34: Leaf Structure and Function

The bundle sheath typically surrounds the larger veins. ____________________

Modified leaves that protect meristematic tissue at the tips of woody plants are known as:

Compare the leaf structure of monocots and eudicots.

Subsidiary cells are the only epidermal cells that have chloroplasts. ____________________

A cross section of a monocot leaf typically shows veins in both cross-section and lengthwise section. ____________________

Identify and describe: A. three different ways in which leaves can be arranged on stems, and list one example for each. B. three different venation patterns in leaves and whether each is characteristic of eudicots or monocots.

Underground stems with fleshy leaves used for storage of water and food are known as:

Leaf abscission is initiated and orchestrated by changing levels of the plant hormone __________.

An alternate leaf arrangement is one in which there is one leaf per node. ____________________

In cactus plants, the__________ is the main organ of photosynthesis.

Palisade mesophyll is a tissue typically found on the side of the leaf toward the upper epidermis.

Parallel venation is characteristic of eudicot leaves. ____________________

The spines of a cactus are actually modified:

Insectivorous plants:

Leaf abscission:

Identify three different types of modified leaves and list the function of each.

The release of liquid water by leaves when soil moisture is high is known as:

A leaf without a blade is said to be sessile. ____________________

Which of the following is not associated with leaf abscission?

The area where the petiole detaches from the stem is referred to as the: