Question

In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called

• A. Filaments
• B. Hyphae
• C. Rhizoids
• D. Roots

Answer 1

The correct option is B

Hyphae

The correct option is B:

Explanation of the correct option:

1. Rhizopus is a saprobic fungus that feeds on dead organic materials that have decomposed. Rhizoids, stolons, and unbranched sporangiophores make up its body, which is made up of branching mycelia with three forms of hyphae: rhizoids, stolons, and unbranched sporangiophores.
2. Rhizoids are hyphae that grow downward into the soil and help in water absorption. A stolen hypha is a slender horizontal hypha that aids in an organism's proliferation. Sporangiophores are unbranched tubular hyphae with rounded sporangia at their tips.
3. Asexual reproduction is accomplished by sporangia, which produce non-motile multinucleate spores.

Explanation of the incorrect options:

Option A:

1. A filament is a type of protein found in fungi, plants, and sponges that binds the vegetative body of an organism to a substratum and is capable of receiving critical nutrients.
2. The rhizoid is located in the thallus of fungi and looks like a root.

Option C:

1. Bryophytes and algae have protuberances that extend from their bottom epidermal cells.
2. They are structurally and functionally similar to the root hairs of vascular land plants. Some fungi produce structures that are similar to this.

Option D:

1. They perform a good job of securing the plant to the ground, a stone, or a limb, among other things.
2. They are not genuine roots, however, because they do not perform the functions of water and nutrient absorption (as well as food storage).

Final Answer: - In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called hyphae.