Question 1

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, which is the growing tissue at the tips of woody plants. This tissue is crucial for the plant's growth and development, and the bud scales serve to shield it from environmental damage and desiccation.

Question 2

Explain the difference between guttation and transpiration.

Accepted Answer

The answer of Explain the difference between guttation and transpiration....

Question 3

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...

Question 4

A leaf without a blade is said to be sessile.

Accepted Answer

A leaf without a petiole (the stalk that attaches the leaf blade to the stem) is said to be sessile, not a leaf without a blade.

Question 5

One benefit of transpiration is that it:
A) concentrates nutrients in plant leaves.
B) distributes nutrients throughout the plant.
C) moves water from the atmosphere to the plant.
D) is responsible for warming plants.
E) brings in water from the soil.

Accepted Answer

Transpiration helps in the movement of water and dissolved nutrients from the roots to different parts of the plant, aiding in nutrient distribution.

Question 6

Excess transpiration:
A) may be harmful to a plant.
B) causes an increase in turgor pressure.
C) is a synonym for precipitation.
D) occurs mainly in the winter.
E) is automatically counteracted by absorbing water from the soil.

Accepted Answer

Excess transpiration can lead to water loss that exceeds the plant's ability to absorb water, potentially causing harm to the plant by dehydrating it and reducing its turgor pressure, which is the pressure of the cell contents against the cell wall.

Question 7

Leaf abscission:
A) occurs as a response to increased temperatures in temperate climates.
B) occurs as a response to dry conditions in tropical climates.
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 in tropical climates often occurs in response to dry conditions as a way to conserve water.

Question 8

Most carnivorous plants grow in poor soil that is deficient in certain essential elements, especially which of the following elements?
A) Potassium
B) Sodium
C) Nitrogen
D) Oxygen
E) Sulfur

Accepted Answer

Carnivorous plants typically grow in environments where the soil is poor in nutrients, particularly nitrogen. They have evolved to obtain nitrogen, which is crucial for their growth, from capturing and digesting insects and other small animals.

Question 9

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 process where plants release excess water from the tips of their leaves when soil moisture levels are high, typically during the night when transpiration is low. This is different from transpiration, which involves the evaporation of water vapor through the stomata of the leaves.

Question 10

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 11

Which of the following have tendrils that are specialized stems (NOT specialized leaves)?
A) Peas
B) Cucumbers
C) Squash
D) Sweet peas
E) Ivy

Accepted Answer

The answer of Which of the following have tendrils that...

Question 12

Which event is associated with leaf abscission?
A) Chlorophyll breaks down.
B) Anthocyanins degrade.
C) Carotenoids are transported from the leaves.
D) Sugars accumulate in the leaves.
E) Leaves turn dark green.

Accepted Answer

Chlorophyll breaks down during leaf abscission, leading to the change in leaf color and eventual leaf fall.

Question 13

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 abscission zone is the area where the petiole detaches from the stem, allowing leaves, flowers, or fruits to fall from the plant.

Question 14

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

Bulbs are underground stems that are surrounded by fleshy leaves, which store food and water, such as those found in onions and tulips.

Question 15

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

Accepted Answer

In an alternate leaf arrangement, each node along the stem has a single leaf, resulting in a pattern where leaves do not directly oppose each other but instead are arranged alternately up the stem.

Question 16

Parallel venation is characteristic of eudicot leaves.

Accepted Answer

Parallel venation is characteristic of monocot leaves, while eudicot leaves typically have a reticulate or net-like venation pattern.

Question 17

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 use modified leaves to trap their prey, which helps them obtain nutrients in nutrient-poor environments.

Question 18

Compare the leaf structure of monocots and eudicots.

Accepted Answer

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

Question 19

Subsidiary cells are the only epidermal cells that have chloroplasts.

Accepted Answer

Guard cells, which are involved in the opening and closing of stomata, also contain chloroplasts and are part of the epidermal layer.

Question 20

Which of the following substances may protect leaves against damage by ultraviolet radiation after abscission?
A) Anthocyanins
B) Coumarins
C) Auxins
D) Coumadins
E) Gibberellins

Accepted Answer

Anthocyanins are pigments that can absorb ultraviolet light, providing protection against UV radiation.

Quiz 34: Leaf Structure and Function

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

Explain the difference between guttation and transpiration.

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.

A leaf without a blade is said to be sessile.

One benefit of transpiration is that it:

Excess transpiration:

Leaf abscission:

Most carnivorous plants grow in poor soil that is deficient in certain essential elements, especially which of the following elements?

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

The spines of a cactus are actually modified:

Which of the following have tendrils that are specialized stems (NOT specialized leaves) ?

Which event is associated with leaf abscission?

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

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

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

Parallel venation is characteristic of eudicot leaves.

Insectivorous plants:

Compare the leaf structure of monocots and eudicots.

Subsidiary cells are the only epidermal cells that have chloroplasts.

Which of the following substances may protect leaves against damage by ultraviolet radiation after abscission?