Which structure in the male reproductive system is primarily responsible for secreting the bulk of the seminal fluid?
The seminal vesicles contribute approximately 60-70% of the total volume of seminal fluid, which nourishes and transports sperm. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.