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A fertilized egg is called a zygote, formed by the union of sperm and egg cells. Other terms like sporophyte, gametophyte, spore, and gamete describe different stages or types of reproductive cells in biology. Understanding these distinctions is key to grasping reproductive biology.


Explanation:

Understanding Fertilized Eggs

A fertilized egg, specifically in biological terms, is known as a zygote. This is the stage that follows the union of a sperm cell (male gamete) and an egg cell (female gamete) during reproduction.

To clarify some of the other terms:

  • Sporophyte: This refers to the diploid phase in plants that produces spores.
  • Gametophyte: This is the haploid phase in the plant life cycle that produces gametes.
  • Spore: A reproductive structure that can develop into a new organism.
  • Gamete: A generic term for reproductive cells (sperm or egg) used in fertilization.

Thus, the correct answer to your question is that a fertilized egg is a zygote, marking the beginning of a new organism's development.


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