Question

The human sperm was first discovered by
A) Von Baer
B) Leeuwenhoek
C) Robert hooke
D) Darwin

Answer 1

Hint: At least 20 - 25 single-lens microscopes of different types, yet only nine survived, were also made by the scientist. These microscopes, carrying hand-made lenses, were constructed of copper or silver plates. Many that survived were able to magnify up to 275 times.

Complete answer:
The human sperm cell becomes haploid, causing its 23 chromosomes to meet the female egg's 23 chromosomes to create a diploid cell. Sperm is contained in the epididymis in animals and is expelled from the penis in a fluid identified as semen after ejaculation.

Now, let us find the solution from the options-
- The blastula and the formation of the notochord were discovered by von Baer. From his studies of these phases in various vertebrates, he discovered that the recapitulation hypothesis of Johann Friedrich Meckel must be incorrect. Thus, option A is not the correct option.

- In 1678, Anton van Leeuwenhoek discovered sperm, and at that time he assumed that sperm were parasitic animals residing within the semen, coining the term spermatozoa, which means sperm animals. Sperm had little to do with the replication of the organism within which they were located, he thought. Subsequently, van Leeuwenhoek assumed that each sperm housed a formulated embryo. Van Leeuwenhoek reported that sperm are seeds in 1685 and that only the nutrient soil in which the seeds are planted is supplied by the female.

- Robert Hooke, an English physicist who invented the elasticity law, known as the law of Hooke, and studied in a wide number of fields. Thus, option C is not the correct option.

- As a scientist, Charles Darwin did not introduce anything but learned a lot; and, as an author, he influenced science and the way we thought of our environment. He proposed and developed an evolution theory. Thus, option D is not the correct option.

Thus, the correct answer is option (B) Leeuwenhoek.

Note: Van Leeuwenhoek, however, attempted for several years and never detected embryos inside the spermatozoa. Nicolas Hartsoeker, the latter sperm co-discoverer, drew an illustration of what he wanted to find: inside each human sperm, a preformed individual.