Microbiology

To solve the problem, we need to analyze the given statements about binary fission and select the correct ones.

1. Analyzing the Statements:

Statement I: "As the binary fission in Paramecium occurs parallel to the longitudinal axis of the body, it is called homothetogenic fission." This statement is incorrect. The correct term is "binary fission," not "homothetogenic fission."
Statement II: "As the daughter Paramecia formed after binary fission are like mirror images, the fission is called symmetrogenetic fission." This statement is incorrect. The correct term is "binary fission," and the daughter cells are typically identical, not mirror images.
Statement III: "Multiple fission in Amoeba is called sporulation." This statement is correct. In Amoeba, multiple fission is indeed called sporulation, where the organism forms spores.
Statement IV: "Union of progametes in the gametes is called amphimixis." This statement is correct. Amphimixis refers to the fusion of gametes during sexual reproduction, which is an essential process in many organisms.

2. Analyzing the Correct Combination:
The correct statements are III and IV.

Final Answer:
The correct option is (C) III, IV.

To solve the problem, we need to identify the type of pseudopodia in Actinophrys.

1. Understanding Pseudopodia in Actinophrys:
Actinophrys, a type of protozoan, uses pseudopodia for movement and feeding. Pseudopodia are temporary projections of the cell's cytoplasm used for locomotion and capturing food.

2. Analyzing the Options:
(1) Lobopodia: These are blunt, finger-like extensions of the cytoplasm, which are typically seen in amoeba-like organisms, but not characteristic of Actinophrys.
(2) Filopodia: These are thin, thread-like extensions of the cytoplasm and are more characteristic of certain amoebas, but not typically Actinophrys.
(3) Reticulopodia: These are networks of interconnected pseudopodia, seen in some amoeba-like organisms. While Actinophrys does have branching projections, this type is not the correct answer.
(4) Heliopodia: These are star-shaped projections, which is the correct type of pseudopodia found in Actinophrys.

3. Identifying the Correct Answer:
The correct type of pseudopodia in Actinophrys is heliopodia, which are radiating projections that form a star-like shape.

Final Answer:
The correct answer is Option D: Heliopodia.

Step 1: Understanding Types of Flagella.
Flagella are differentiated based on their structural complexity and the arrangement of microtubules. Key types include:
Acronematic: Simple, single microtubules.
Pantonematic: Multiple microtubules arranged in complex patterns.
Stichonematic: Flagella with a series of fine, hair-like lateral fibrils along the shaft.
Anematic: Absence of typical flagellar structures.
Step 2: Identifying Flagella in Protozoans.
Astasia is a genus of flagellate protozoans, closely related to Euglena, known primarily for their swimming and motility mechanisms enabled by their flagella.
Step 3: Associating the Correct Type with Astasia.
Astasia is characterized by having stichonematic flagella, which include additional fibrillar structures that aid in its movement and are more complex than the simplest forms like acronematic.