Which plant's seeds germinated after a dormancy period of approximately $10,000$ years?

The fleshy part of the fruit in $Cashew$ and $Litchi$ is known as:

Give the importance of seeds.

How many years old is the viable seed of date palm $(Phoenix dactylifera)$ discovered during the archaeological excavation at King Herod's palace near the Dead Sea?

Assertion: Coconut tree is distributed in coastal areas over a large part of the world.
Reason: Coconut fruit can float and get dispersed over thousands of kilometers before losing viability.

Explain the structure and types of seeds.