Step 1: Concept
Cellular structures and their functions in algae
Step 2: Meaning
Understanding the cellular components specific to algal flagella, particularly those involved in motility.
Step 3: Analysis
Stigma is not a part of the flagellum. Amyloplast stores starch, blepharoplasts are related to light perception, and pyrenoids are associated with carbon fixation. Blepharoplasts have been identified as sensory structures that may play a role in algal motility.
Step 4: Conclusion
Blepharoplasts are involved in the sensory functions of algal flagella, contributing to their neuromotor apparatus.
Final Answer: (B)