Deficiency symptoms tend to appear first in_____whenever the essential elements are relatively immobile and are not transported out of the mature organs.

Options

A. younger tissues
B. older tissues
C. roots
D. shoots

Explanation

To solve the question regarding where deficiency symptoms tend to appear first when essential elements are relatively immobile, we can follow these steps:

### Step 1: Understand Deficiency Symptoms
Deficiency symptoms in plants refer to the morphological changes that occur due to the lack of essential minerals. These symptoms can vary depending on the specific element that is deficient.

**Hint:** Think about how plants show signs of nutrient deficiency and what those signs might look like.

### Step 2: Differentiate Between Mobile and Immobile Elements
Elements in plants can be classified as mobile or immobile. Mobile elements, such as potassium and magnesium, can move from older tissues to younger tissues when there is a deficiency. In contrast, immobile elements, like calcium and sulfur, cannot be transported out of mature organs.

**Hint:** Consider how the location of the nutrient affects where symptoms will manifest in the plant.

### Step 3: Identify Where Symptoms Appear for Immobile Elements
When essential elements are immobile, deficiency symptoms will first appear in the younger tissues (such as young leaves) because these elements cannot be moved from older tissues to newer ones.

**Hint:** Remember that if a nutrient cannot move, it will affect the parts of the plant that are still growing.

### Step 4: Conclusion
Based on the understanding of mobile and immobile elements, we conclude that deficiency symptoms tend to appear first in the younger tissues when the essential elements are relatively immobile.

**Final Answer:** The deficiency symptoms tend to appear first in **younger tissues**.