The abscission layer __________.

• A. causes a shoot to bend toward light
• B. secretes cytokinin
• C. is the location of the biological clock in a plant
• D. detects light and measures the photoperiod
• E. is where a leaf separates from a stem

Answer: (E)

Verified step by step guidance

1. Understand the term 'abscission layer': In plants, the abscission layer is a specialized layer of cells located at the base of a leaf, fruit, or flower stem. Its primary function is to facilitate the separation of these parts from the plant.
2. Recognize the role of the abscission layer: The abscission layer is responsible for the process of abscission, which is the shedding of leaves, fruits, or flowers. This process is crucial for plant health and survival, allowing the plant to conserve resources or prepare for seasonal changes.
3. Identify the incorrect options: The abscission layer does not cause a shoot to bend toward light, secrete cytokinin, serve as the location of the biological clock, or detect light and measure the photoperiod. These functions are related to other plant structures and hormones.
4. Focus on the correct function: The abscission layer is specifically where a leaf separates from a stem. This separation is often triggered by environmental factors or changes in hormone levels within the plant.
5. Conclude with the correct answer: Based on the understanding of the abscission layer's function, the correct answer is that it is where a leaf separates from a stem.