Oldest seed is of this plant
Lupinus arcuticus
Orobanche
Mango
Coconut
Seeds are adaptively important because
$1.$ they maintain dormancy
$2.$ they protect young plants during vulnerable stages
$3.$ they store food for young plants, and facilitate dispersal
Give importance of seed.
Thalamus contributes in the fruit formation in
Seed coat is not thin, membranous in
Give differences : False Fruit and True Fruit