Problem 95 - Objective Biology for NEET

Question

Embryo is made up of (a) A radicle (b) Embryonal axis (c) One or two cotyledons (d) All of these

Step-by-Step Solution

Answer

The correct answer is (d) All of these

Step 1 Understand the Biological Terms

A radicle is the embryonic root of the plant. The embryonal axis is the central part of the embryo, connecting the cotyledons and radicle. Cotyledons are embryonic leaves in seed-bearing plants, one or two of which are found attached to the embryonic axis of most seeds during germination.

Step 2 Comparison with Embryo Structure

Analyze the whole structure of an embryo which comprises of an embryonal axis and at least one cotyledon. The radicle is a part of the embryonal axis, it is the part that will eventually develop into the root of the plant.

Step 3 Conclusion

After understanding each term, it becomes clear that all these parts - a radicle, an embryonal axis, and one or two cotyledons - are components of an embryo. Therefore, all the given options are correct.

Key Concepts

Radicle: The Embryonic Root

Think of the radicle as the first hero to emerge in the saga of a growing plant. It's the embryonic root that signals the start of a seedling's growth. During germination, the radicle is the initial part to break free from the seed's confines, forging downward to anchor the plant and absorb nutrients and water from the soil.

This tiny, yet mighty structure plays a pivotal role in the survival of the seedling, ensuring it's firmly planted in its new environment. As students of botany, it's important to recognize the radicle not just as part of the plant's anatomy, but as the crucial foundation for its future growth and stability.

Embryonal Axis: The Central Command of Plant Embryo

The embryonal axis is akin to a plant's command center during the embryonic stage. It bridges the gap between the cotyledons and the radicle, orchestrating the growth and development of the plant embryo. Picture it as the backbone of a developing seedling, from which all essential structures arise.

Understanding the embryonal axis will give you a clearer picture of the plant's initial developmental phase. It's an illustration of nature's complexity and organization, ensuring that every part of the plant is properly formed and connected, setting the stage for a healthy, thriving organism.

Cotyledons: Nature's First Leaves

Consider cotyledons the first baby steps in a plant's journey to photosynthesis. These embryonic leaves are the first to greet the world as a seed germinates, serving an essential role in providing the nutrients the young plant needs to grow. Depending on the species, a seed may have one (monocotyledon) or two (dicotyledon) of these nutrient-rich structures.

For young botanists, identifying cotyledons is an exciting foray into understanding plant biology. They are a testament to the adaptability and preparatory nature of plants—how even before emerging from the soil, they are equipped to sustain themselves and forge ahead in their lifecycle.