Which one of the following structures is not a male accessory gland?

The correct answer is Option (2) → Seminiferous tubules

The male accessory glands are the seminal vesicles, the prostate and the bulbourethral glands. Their secretions make the seminal plasma, which is rich in fructose, calcium and certain enzymes.

(1) Seminal vesicles — A male accessory gland. They are a pair.

(2) Seminiferous tubules — Not a male accessory gland. They are the coiled tubules inside the testis, where sperms are formed.

(3) Prostate gland — A male accessory gland. It is a single gland.

(4) Bulbourethral gland — A male accessory gland. They are a pair, and their secretion helps in the lubrication of the penis.

Note: A similar question was also asked in CUET (UG) 2025 on 02-06-2025 (Slot 2).

NCERT Extract:
The Male Reproductive System – “… The male accessory glands (Figure 2.1a, b) include paired seminal vesicles, a prostate and paired bulbourethral glands. Secretions of these glands constitute the seminal plasma which is rich in fructose, calcium and certain enzymes.”
The Male Reproductive System – “… Each lobule contains one to three highly coiled seminiferous tubules in which sperms are produced.”