The megasporangium of the angiosperms on maturation gives rise to:

The seed of $Lupinus \text{ } arcticus$ excavated from Arctic Tundra, germinated and flowered after an estimated record of dormancy of how many years (in $years$)?

Thalamus contributes to the fruit formation in

In the seeds of cereals,the single cotyledon is represented by the .......

In watermelon, the ovary after fertilization increases by about . . . . . . times in volume to form the fruit.

The edible part of the litchi fruit is: