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Chapter 23: Problem 33

Ethylene promotes the fall of leaves by triggering the death of cells and abscission. What region of the leaf responds to ethylene? a. the lamina, where photosynthesis takes place b. the vein, which carries nutrients and water in and out of the leaf c. the petiole, which attaches the leaf to the stem d. the margin, which is serrated and may be sharp

Short Answer

Expert verified
c. the petiole, which attaches the leaf to the stem

Step by step solution

01

Identify the Prompt

Understand that ethylene is a hormone that triggers cell death and abscission, leading to the fall of leaves.
02

Analyze Each Option

Examine each given option to determine which part of the leaf responds to ethylene: a. The lamina where photosynthesis occurs. b. The vein which carries nutrients and water. c. The petiole which attaches the leaf to the stem. d. The margin which is the edge of the leaf.
03

Relate to Leaf Abscission

Compare each option to the process of leaf abscission and cell death. Identify that the petiole is crucial as it is the point of attachment to the stem, and where abscission occurs.
04

Choose the Right Answer

Conclude that the petiole is the region of the leaf that responds to ethylene by triggering cell death and abscission.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Ethylene Hormone
Ethylene is a simple gaseous plant hormone. It plays a significant role in regulating various plant processes. One of its primary functions is to promote fruit ripening. When fruits emit ethylene, they continue ripening and aging until they fall off. But its role doesn't end there. Ethylene also regulates leaf abscission, the process where leaves detach from the plant.
Ethylene interacts with plant cells and triggers specific responses, such as cell death and the formation of abscission zones. Understanding ethylene helps us grasp how plants manage their lifecycle and adapt to their environment.
Leaf Abscission
Leaf abscission is a natural part of a plant's life. It's the process by which plants shed their leaves. This occurs in response to various environmental cues, like seasonal changes or stress conditions like drought. Ethylene significantly influences this process. It triggers the development of the abscission zone, a specialized area at the base of the leaf's petiole.
In the abscission zone, cells break down, which allows the leaf to detach easily. This process not only helps plants conserve water and energy during unfavorable conditions but also aids in the spread of seeds and reduces the risk of disease and decay.
Cell Death in Plants
Cell death is an essential process in plant development and defense. In the context of ethylene and leaf abscission, cell death occurs in the abscission zone. This deliberate cell death is known as programmed cell death (PCD).
PCD is a controlled process where specific cells die off, ensuring the rest of the plant remains healthy. In leaf abscission, PCD helps create a separation layer so the leaf can detach smoothly. This contrasts with necrosis, where cells die due to injury or disease, which is often uncontrolled and detrimental to the plant.
Plant Physiology
Plant physiology is the study of how different parts of a plant function. It includes understanding processes like photosynthesis, respiration, and plant hormone action. Ethylene's role in leaf abscission provides a good example of plant physiology.
The leaf petiole, which connects the leaf to the stem, is where the abscission zone forms. Ethylene's effect on the petiole showcases how hormones influence plant physiology. Observing how plants manage these processes helps us understand their growth, adaptation, and survival mechanisms. Knowledge of plant physiology is crucial for agriculture, conservation, and understanding ecological dynamics.

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Most popular questions from this chapter

Which adaptation is most likely to be found in a desert environment? a. broad leaves to capture sunlight b. spines instead of leaves c. needle-like leaves d. wide, flat leaves that can float

A lab technician is looking for a slide that shows an example of permanent tissue. Which slide is the best choice? a. a slide of the apical bud of a stem b. a slide obtained from the intercalary meristems c. lateral meristem in the vascular cambium d. secondary xylem

Why is shade avoidance an important survival mechanism for plants? Would you expect seeds with large energy storage to display as strong a response of shade avoidance as small seeds with limited reserves? a. A seedling growing in the shade of a mature plant will not have enough light to promote meristematic growth. A seed with large storage will be able to sustain growth until its seedling can reach enough light for photosynthesis. b. A seedling growing in the shade of a mature plant will not have enough light to promote photosynthesis. Small seeds with limited reserve will be able to sustain growth until seedlings can reach enough light for photosynthesis. c. A seedling growing in the shade of a mature plant will not have enough light to promote photosynthesis. A seed with large storage will be able to sustain growth until its seedling can reach enough light for photosynthesis. d. A seedling growing in the shade of a mature plant will not have enough light to promote respiration. Small seeds with limited reserve will be able to sustain growth until their seedlings can reach enough light for photosynthesis.

A time course is developed to follow the fate of the vascular bundles in the stem of dicots. Sections along the stem are fixed, stained, and observed under a microscope. What happens to the vascular bundles in the stem of a dicot as the plant matures? a. The vascular bundles join to form growth rings. b. The vascular bundles divide into primary xylem and primary phloem. c. The vascular bundles divide into secondary xylem and primary phloem. d. The vascular bundles die out.

Some desert plants have taproots that extend up to 20-30 feet underground. Others have fibrous root systems that cover wide areas. What are the advantages of a deep taproot and the advantages of a fibrous root system in a desert? a. A deep taproot can reach the deeper soil regions that stay moist after several rainfalls. A shallow fibrous system provides additional support to anchor the plant in the desert. b. A deep taproot provides additional support to anchor the plant in the desert. A shallow fibrous system increases the amount of water that can be absorbed after a light rainfall when the soil dries quickly in the desert. c. A deep taproot increases the amount of water that can be absorbed after a light rainfall when the soil dries quickly in the desert. A shallow fibrous system can reach the deeper soil regions that stay moist after several rainfalls. d. A deep taproot can reach the deeper soil regions that stay moist after several rainfalls. A shallow fibrous system increases the amount of water that can be absorbed after a light rainfall when the soil dries quickly in the desert.
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