Problem 10 - Campbell Biology

Question

A strawberry plant mutant that fails to make stolons would suffer from (A) too little mineral absorption. (B) a tendency to topple over. (C) too little water absorption. (D) a reduction in asexual reproduction.

Step-by-Step Solution

Answer

D) a reduction in asexual reproduction.

Step 1: Understanding Stolons

Stolons, also known as runners, are horizontal connections between organisms. In plants like strawberry plants, stolons are used for asexual reproduction to spread and generate new plants at nodes.

Step 2: Evaluating Each Option

Analyze each given option in the context of the function of stolons.

Step 3: Analyzing Option (A)

Mineral absorption occurs through the root system, not stolons. Therefore, failure to make stolons will not affect mineral absorption.

Step 4: Analyzing Option (B)

Stolons do not play a role in structural support of the plant. Toppling over is more related to the root system and the plant’s physical structure.

Step 5: Analyzing Option (C)

Water absorption is also managed by roots, not stolons. So, the absence of stolons does not directly impact water absorption.

Step 6: Analyzing Option (D)

Stolons are crucial for the asexual reproduction of strawberry plants. Without stolons, the plant would not be able to spread as easily through this method.

Step 7: Conclusion

The correct answer is option (D) because the primary role of stolons is in asexual reproduction.

Key Concepts

Stolons

Stolons, often called runners, are horizontal stems that grow at or just above the ground's surface. This unique plant structure is common in strawberry plants and plays a crucial role in their reproduction. Stolons sprout from the parent plant and can generate new plants at specialized nodes, where roots and shoots emerge. This way, the new plant establishes itself as an independent organism, although it is genetically identical to the parent.
For example, strawberry plants use stolons to spread rapidly and cover ground, enabling them to colonize new areas without requiring seeds. This method of propagation is particularly beneficial in stable environments where conditions favor the growth of genetically identical clones.
Key features of stolons include:

• Horizontal growth: Unlike regular stems, stolons extend sideways.
• Node formation: New plants can grow from specific points along the stolon.
• Asexual reproduction: Stolons create exact copies of the parent plant.

Asexual Reproduction

Asexual reproduction is a mode of reproduction that doesn't involve the fusion of gametes. In plants, this means new organisms are formed from a single parent without the genetic mixing seen in sexual reproduction.
For strawberry plants, stolons are a primary means of asexual reproduction. This method offers several advantages:

• Speed: It allows rapid colonization of new areas.
• Energy Efficiency: It requires less energy compared to producing seeds.
• Consistency: The offspring are genetically identical to the parent, ensuring successful traits are preserved.

However, asexual reproduction can be risky if the environment changes, as all clones share the same genetic susceptibility. For balanced survival, some plants can switch between asexual and sexual reproduction depending on conditions.
Asexual reproduction mechanisms in plants include:

• Spores: Found in ferns and fungi.
• Bulbs: Common in onions and tulips.
• Rhizomes: Present in grasses and ginger.
• Stolons: Used by strawberries.

Plant Physiology

Plant physiology explores the functions and vital processes of plants. Understanding how plants grow, reproduce, and interact with their environment helps us appreciate structures like stolons.
Key aspects of plant physiology include:

• Photosynthesis: The process by which plants convert sunlight into energy.
• Absorption: Roots absorb water and nutrients from the soil.
• Respiration: Plants metabolize sugars to generate energy.
• Growth: Cells divide and expand, enabling the plant to increase in size.

In the context of strawberry plants, stolons represent an adaptation that facilitates asexual reproduction. Although stolons are not involved in mineral or water absorption (which is the job of roots), they play an essential role in spreading the plant over a wider area.
Stolons demonstrate the complexity and efficiency of plant physiology, allowing plants to reproduce effectively and adapt to their environments.
Additionally, the study of plant hormones explains how stolons develop. Hormones like auxins and cytokinins regulate the growth of these structures, ensuring new nodes grow into full-fledged plants when conditions are favorable.
This interconnectedness of different physiological processes highlights the intricate balance plants maintain to thrive and reproduce.