Potato is (underground) stem because it

A. Possesses axillary buds (eyes).

B. Lacks chlorophyll.

C. Does not bear roots.

D. Contains reserve food.

To understand why a potato is classified as an underground stem, we need to look at its characteristics and functions. The correct answer to your question is A: Possesses axillary buds (eyes). Let’s break down why this is the case and explore the other options as well.

Characteristics of Potatoes

Potatoes are fascinating plants that grow underground, and they have unique features that distinguish them from other parts of the plant, such as roots. Here’s a closer look at the reasons why potatoes are considered underground stems:

1. Axillary Buds (Eyes)

The most significant reason is that potatoes have axillary buds, commonly referred to as "eyes." These buds can develop into new shoots and leaves, which is a characteristic of stems. When you plant a potato, these eyes can sprout and grow into a new potato plant, demonstrating that they function like stems rather than roots.

2. Lack of Chlorophyll

While it’s true that potatoes lack chlorophyll, this characteristic alone does not define them as stems. Many stems, especially those that grow in the shade or underground, can also lack chlorophyll. Therefore, option B does not provide a strong basis for classifying potatoes specifically as stems.

3. Absence of Roots

Potatoes do not bear roots in the traditional sense, but this is not a defining feature of stems. In fact, potatoes do have a root system that develops from the plant. The tuber itself is a modified stem that stores nutrients, while the roots grow from the base of the plant. Thus, option C is misleading.

4. Reserve Food Storage

Potatoes are known for storing reserve food, primarily in the form of starch. While this is a characteristic of many stems, it does not solely define them as stems. Other plant parts, including roots, can also store food. Therefore, option D does not specifically justify why potatoes are classified as underground stems.

Conclusion

In summary, the defining feature that classifies potatoes as underground stems is their possession of axillary buds, or "eyes," which can sprout into new plants. This characteristic, along with their ability to store nutrients, highlights their role as modified stems rather than roots. Understanding these distinctions helps us appreciate the complexity of plant structures and their functions in nature.