Question

The union of ovum and sperm is known as

• A. . Placentation
• B. . Ovulation
• C. . Folification
• D. . Fertilization

Hint:

Remember the distinct stages of reproduction: Ovulation (egg release), Fertilization (sperm-egg fusion), Implantation (zygote attachment), Placentation (placenta formation).

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
The question asks for the biological term that describes the fusion of an ovum (egg cell) and a sperm cell.

Step 3: Detailed Explanation:
* Fertilization: This is the process where a male gamete (sperm) fuses with a female gamete (ovum or egg) to form a zygote. This event marks the beginning of embryonic development in sexual reproduction.
* Placentation: This refers to the formation or arrangement of the placenta in the uterus, which provides nourishment to the developing fetus.
* Ovulation: This is the process by which a mature egg is released from the ovary.
* Folification: This term is not standard in biology. It might be a misspelling or an unfamiliar term. The process of follicle development is folliculogenesis.
Therefore, the union of ovum and sperm is known as fertilization.

Step 4: Final Answer:
The union of ovum and sperm is known as Fertilization.

Answer 2

This question asks which term describes the fusion of an ovum and a sperm. Thinking through the sequence of events in human reproduction helps place each option correctly, since these four terms describe different stages of the same overall process.

1. Placentation: This happens well after the egg and sperm have already joined and the resulting embryo has implanted in the uterus. It describes the growth of the placenta, the organ that later nourishes the developing baby, so it comes much later in the timeline than the fusion event itself.
2. Ovulation: This happens before the egg and sperm can meet at all. It is the release of a mature egg from the ovary into the fallopian tube, which only creates the opportunity for fusion, without describing the joining of the two gametes.
3. Folification: This is not a recognised term in reproductive biology. It appears to be a made up or misspelled word, and no standard process by this name exists.
4. Fertilization: This is the exact moment a sperm cell penetrates and fuses with the ovum, combining their genetic material to form a single cell called a zygote. This is the specific event the question describes, the joining of the two gametes.

Placing these four terms on the reproductive timeline, ovulation, then fertilization, then implantation and placentation, shows that only fertilization refers to the actual union of the two gametes.

Therefore, the correct answer is Fertilization.