The sponge which is generally gifted in marriages by Japanese is ______.

Explanation

**Step-by-Step Solution:**

1. **Identify the Context:** The question asks about a specific type of sponge that is traditionally gifted during Japanese marriages.

2. **Recall Relevant Information:** From the video transcript, we learn that the sponge in question is known as the Venus Flower Basket.

3. **Scientific Name:** The transcript mentions that the scientific name for this sponge is Uplectella.

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