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Chapter 21: Problem 15

An apple tree has yellow splotches on the leaves. This is a symptom of _____. a. cell necrosis b. discoloration c. hyperplasia d. hypoplasia

Short Answer

Expert verified
b. discoloration

Step by step solution

01

Identify the Symptom

Understand the symptom described in the exercise: yellow splotches on the leaves of the apple tree.
02

Recognize the Possible Conditions

Read the possible conditions: cell necrosis, discoloration, hyperplasia, and hypoplasia.
03

Analyze Each Condition

Evaluate what each condition means: - Cell Necrosis: Death of cells or tissues.- Discoloration: Change in the natural color.- Hyperplasia: Increase in the number of cells.- Hypoplasia: Underdevelopment or incomplete development of a tissue or organ.
04

Match Symptom to Condition

Compare the symptom (yellow splotches on the leaves) with the descriptions of each condition. Yellow splotches indicate a change in color, not cell death, an increase in cell number, or underdevelopment.
05

Determine the Answer

The correct condition associated with yellow splotches on leaves is discoloration.

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Key Concepts

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

Symptom Identification
When plants exhibit signs of distress, it鈥檚 essential to identify the symptoms accurately.
This step is critical in diagnosing the problem.
In plant pathology, symptoms are the plant鈥檚 way of signaling that something is wrong.
Symptoms can range widely, from visible changes like leaf discoloration to more subtle signs.
In this specific case, the symptom is yellow splotches on the leaves of an apple tree.
Accurate symptom identification allows us to narrow down the potential causes and move forward with appropriate treatment.
Leaf Discoloration
Leaf discoloration is a common symptom in plants and can indicate numerous issues.
In the provided exercise, we have yellow splotches on the leaves of an apple tree.
This condition is described under 'discoloration', which is a visible change in the leaf's natural color.
Leaf discoloration can result from several factors, including:
  • Nutrient deficiencies: Plants may lack essential nutrients like nitrogen, potassium, or magnesium, leading to color changes.
  • Pests and diseases: Insects, fungi, and bacteria can attack plants, causing discoloration.
  • Environmental stress: Excessive sunlight, drought, or waterlogging can change the leaf color.
  • Chemical exposure: Exposure to herbicides or pollutants can also lead to leaf discoloration.
Noticing and correctly identifying discoloration promptly can help mitigate the underlying problem and restore the plant's health.
Plant Pathology
Plant pathology is the scientific study of plant diseases caused by pathogens and environmental conditions.
It involves the detailed investigation of disease causes, the mechanisms of plant disease resistance, and effective control measures.
In the context of our exercise:
  • **Pathogens**: These can be fungi, bacteria, viruses, or nematodes that infect plants and cause disease symptoms like leaf discoloration.
  • **Environmental conditions**: Factors like soil quality, water availability, and climate also play roles in plant health and disease manifestation.
Plant pathologists work to understand how diseases develop and spread, devising strategies to prevent and control outbreaks.
Early detection through symptom identification is crucial in managing plant diseases.
By recognizing symptoms, diagnosing diseases, and implementing appropriate interventions, the overall health of plants can be maintained effectively.

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