A prickly seed case is a protective structure that surrounds a seed and is covered in sharp or pointed projections. These prickles help deter animals from consuming or damaging the seed, allowing it to disperse and grow successfully.
The answer to that is a string bean or a cactus seed they are mighty prickley! : )
Seed coat.
A thistle bird seed is a seed that comes from a prickly plant usually produces a purplish or yellowish flower.
germination
linseed.
The shell covering a seed is sometimes called a hull.
Moon Flower
Prickly pear cactus can reproduce by seed, root division and by cuttings from the paddles being individually rooted.
seed leaves
An egg
Aril, testa, hull