The top red box is the structure that fuses to form a diploid zygote during sexual reproduction. This top structure is usually the cap that contains numerous spores.
What is Zygote?
Zygote may be defined as the outcome of successful fertilization between male and female gametes. It is diploid in nature.
The spores of such cap structure contain a nuclear pair that is responsible for the formation of the diploid nucleus and thus the resultant zygote.
The bottom red box illustrates hyphae, and the middle boxes represent the ring and stem portion respectively.
Therefore, the top red box is the structure that fuses to form a diploid zygote during sexual reproduction. This top structure is usually the cap that contains numerous spores.
To learn more about Sexual reproduction in fungi, refer to the link:
https://brainly.com/question/4514378
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