The correct option is
D. rhizoids.
Detailed Explanation:
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Understanding the Structure: In lower plants, such as mosses, the structures that perform similar functions to the roots of higher plants are called rhizoids. Rhizoids are hair-like structures that anchor the plant to the substrate (like soil or rocks) and help in the absorption of water and nutrients.
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Function of Rhizoids:
- Anchorage: Rhizoids help to secure the moss to the ground or other surfaces, preventing it from being washed away by water or blown away by wind.
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Absorption: While they do not have the same complex structure as roots in higher plants, rhizoids can absorb water and minerals from the surrounding environment. This is crucial for the survival of mosses, which often grow in moist environments.
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Comparison with Higher Plant Roots:
- In higher plants, roots are more complex structures that not only anchor the plant but also have specialized tissues for nutrient and water transport (like xylem and phloem). Rhizoids, on the other hand, are simpler and do not have these specialized tissues, but they serve a similar basic function of anchoring and absorption.
Why the Other Options are Incorrect:
- A. Root Hairs:
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Root hairs are extensions of root cells in higher plants that increase the surface area for absorption. They are not found in mosses or other lower plants. Therefore, this option is incorrect as it refers specifically to a structure in higher plants.
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B. Rootlets:
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Rootlets are small roots that branch off from a main root in higher plants. Like root hairs, they are not applicable to mosses or lower plants. This option is also incorrect because it pertains to structures in more complex plant systems.
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C. Hyphae:
- Hyphae are the filamentous structures that make up the mycelium of fungi. They are involved in nutrient absorption and decomposition but are not related to the root-like functions in mosses. This option is incorrect as it refers to a completely different kingdom of organisms (fungi).
Summary of Key Points:
- Rhizoids are the structures in mosses that function similarly to roots in higher plants, providing anchorage and some absorption capabilities.
- They are simpler than roots and do not have specialized tissues like xylem and phloem.
- Other options (root hairs, rootlets, hyphae) refer to structures in higher plants or fungi and are not applicable to mosses.
Revision Summary:
- Rhizoids anchor mosses and help in water absorption.
- They are simpler than roots in higher plants.
- Other options (root hairs, rootlets, hyphae) do not apply to mosses.
- Understanding the function and structure of rhizoids is crucial for differentiating between plant types.