The cotyledons provides a source of food to the seed and seedling that is germinating, while the seed coat protects it.
The seed coat has busted and the seedling is beginning to emerge
The seed coat protects the seed from mechanical damage, pathogens, and dehydration during dormancy. Cotyledons are the embryonic leaves in a seed that provide nutrients to the seedling until it can produce its own food through photosynthesis.
The contents of a seed are used up after germination by the seedling growing from it.
Your avocado seed split in half because of internal pressure caused by the growing seedling inside. This is a natural process as the seedling expands and pushes against the seed coat, eventually causing it to split open.
Seeds absorb water through a process called imbibition, where water is taken in by the seed coat and then absorbed by the seed's cells. This initial hydration triggers metabolic processes that lead to germination and seedling growth. Absorption of water is essential for activating enzymes, softening the seed coat, and providing necessary nutrients for the growing seedling.
Germination happens between the seed and seedling stages of the plant.
Roots are not part of a seed. Seeds typically consist of the embryo, endosperm, and seed coat. Roots develop after germination when the seedling starts to grow.
seed leaves provide food for the seedling
The three main parts of an angiosperm seed are the seed coat, the endosperm, and the embryo. The seed coat provides protection for the embryo, the endosperm serves as a source of nutrients for the developing seedling, and the embryo contains the future plant in a dormant state.
Any seed has a hard coat thet protects the seed until the conditions for germination are suitable for survival of the seedling.
The cotyledon of the seed develops into a seedling at the time of germination.