**Incorrect Statements:**

1) Secretion of Cowper's gland is acidic.
2) Fructose is found in seminal plasma.
3) Perineal gland in humans produce odorous secretion.
4) Prostaglandins are produced by the prostate gland.

**Explanation:**

1) Secretion of Cowper's gland is acidic:
The secretion from the Cowper's gland, also known as bulbourethral gland, is actually alkaline in nature. These glands are located below the prostate gland in males. The alkaline secretion helps neutralize the acidity of the urethra and provides lubrication during sexual arousal. The alkaline nature of the Cowper's gland secretion is important for the survival and protection of sperm as it travels through the urethra.

2) Fructose is found in seminal plasma:
This statement is correct. Fructose is indeed found in seminal plasma. Seminal plasma is the fluid component of semen, which is released during ejaculation. It acts as a medium for sperm transport and provides nutrients to support sperm motility and viability. Fructose is one of the main nutrients present in seminal plasma. It serves as an energy source for sperm cells, providing them with the necessary fuel to swim and fertilize the egg.

3) Perineal gland in humans produce odorous secretion:
This statement is incorrect. Humans do not possess a perineal gland. However, there are apocrine glands located in the perineal region, which can contribute to body odor. Apocrine glands are present in areas like the armpits and groin region and secrete a milky fluid that contains proteins and lipids. When bacteria on the skin break down these secretions, it can result in a characteristic odor.

4) Prostaglandins are produced by the prostate gland:
This statement is correct. The prostate gland is responsible for producing and secreting various substances, including prostaglandins. Prostaglandins are hormone-like substances that play a role in inflammation, blood flow regulation, and smooth muscle contraction. In the context of the prostate gland, prostaglandins are involved in the contraction of smooth muscles in the prostate, helping to propel semen during ejaculation.

In summary, out of the four statements, one is incorrect, which is the statement that the secretion of Cowper's gland is acidic. The correct information is that the secretion of Cowper's gland is alkaline.

3 (1,3,4 are wrong)