The union of the ovum and sperm is termed:

Question

BlackTom AI · Accepted Answer

The question asks for the term that describes the union of the ovum and sperm. 
Because the answer options are not provided in the data, we cannot analyze each alternative choice directly. However, we can explain the correct term and why it fits the concept.
First, consider the biology: when a sperm cell fuses with an egg cell (ovum) during sexual reproduction, the resulting cell is a zygote. The event of the sperm and ovum coming together is specifically termed fertilization. This process initiates embryonic development and restores the diploid number of chromosomes by combining genetic material from both parents.
If we imagine possible distractors that might appear in a typical list, terms like 'conception' could refer to the broader beginning of pregnancy rather than the cellular fusion event, while 'implantation' refers to the embryo attaching to the uterine lining, which occurs after fertilization. 'Gamete fusion' is technically descriptive but not the conventional term used in standard anatomy or physiology for the union of the two gametes. 'Zygote formation' describes the product after the union occurs, not the act itself.
Since the supplied answer field indicates 'fertilization' as the correct answer, this aligns with the standard terminology for the union of the ovum and sperm. This term accurately captures the moment of gamete fusion and the initiation of embryogenesis, distinguishing it from subsequent stages like zygote, morula, blastocyst, and implantation.
In sum, fertilization is the event that describes the union of the ovum and sperm, leading to the formation of a zygote and the start of development. The lack of answer options means we cannot critique specific alternatives here, but the concept of fertilization is the correct biological descriptor for the described union.

The union of the ovum and sperm is termed:单项选择题

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