Question

During sexual reproduction in Rhizopus, projections from two compatible hyphae are attracted towards each other. These hyphae are called -

• A. Chlamydospores
• B. Azygospores
• C. Progametangia
• D. Zygophores

Hint:

Remember the sequence in {Rhizopus} sexual reproduction: Compatible hyphae produce \textbf{Zygophores} (the branches) \(\rightarrow\) tips swell to form \textbf{Progametangia} \(\rightarrow\) septa form \textbf{Gametangia} \(\rightarrow\) gametangia fuse to form a \textbf{Zygospore}. The question asks about the initial branches.

Answer 1

The Correct Option is D

Step 1: Concept Summary:
The question identifies the specialized hyphae of {Rhizopus} (a Zygomycete fungus) that facilitate sexual reproduction by growing towards each other.
Step 2: Detailed Explanation:
Let's define terms related to {Rhizopus} sexual reproduction:

Zygophores: These specialized, aerial hyphae extend from compatible mating strains (+ and -). They exhibit chemical attraction and grow toward each other, effectively "zygote bearers." This accurately describes the hyphae in question.

Progametangia: Upon zygophore contact, the tips swell, forming progametangia before septum formation. These are structures {at the tip} of the hyphae, not the hyphae themselves.

Chlamydospores: These are thick-walled asexual spores formed by hyphal rounding. They are NOT involved in sexual reproduction.

Azygospores: These spores develop parthenogenetically (without fertilization) from a gametangium, resembling zygospores. They are spores, not hyphae.

Step 3: Final Answer:
The question targets the hyphae that attract each other. These specialized projections are called zygophores.