Male gametes, also known as sperm cells, are the reproductive cells produced by males. They are responsible for carrying the father's genetic information and are essential for sexual reproduction. However, there is an incorrect statement about male gametes in the given options, which is option 'A' - They are diploid.

Explanation:

1. Male gametes are haploid:
Male gametes, like all gametes, are haploid cells. Haploid cells contain only one set of chromosomes, which is half the number of chromosomes found in a diploid cell. In humans, the male gametes contain 23 chromosomes, which is half of the total number of chromosomes (46) found in most cells of the body. This haploid state is necessary to maintain the proper chromosome number during fertilization, where the male and female gametes fuse to form a diploid zygote.

2. Production of male gametes by meiosis:
Male gametes are produced through a specialized cell division process called meiosis. Meiosis consists of two rounds of cell division, resulting in the production of four haploid cells. In males, meiosis occurs in the testes within structures called seminiferous tubules. It involves a series of stages, including DNA replication, homologous chromosome pairing, crossing over, and separation of chromosome pairs. Meiosis ensures genetic diversity by shuffling and recombining genetic material during the formation of gametes.

3. Flagellation of male gametes:
Male gametes are typically flagellated, meaning they possess a tail-like structure called a flagellum. The flagellum allows the sperm cells to swim and move towards the female reproductive tract, aiding in the process of fertilization. However, it is important to note that not all male gametes are flagellated. Some organisms, such as certain plants and fungi, produce non-motile male gametes that rely on external factors for transportation.

In conclusion, the correct statement about male gametes of humans is that they are always haploid. They are produced by meiosis and are often flagellated, but not always. The incorrect statement is that they are diploid, as male gametes are haploid cells.