The cotyledon, which forms in the embryo of a seed before germination, stores food for the embryo. Along with the endosperm, the cotyledon nourishes the new growth of the plant. It is the part of the seed that emerges from the testa, or hard covering, during germination. It sometimes grows upward, turning into a set of leaves as the seed germinates, using photosynthesis to nourish the newly forming plant further.Know More
The leaves formed by the cotyledon sometimes drop off as the plant's first real leaves, which look different from the leaves formed by the cotyledon, emerge. Other times, they remain a part of the plant for years. A cotyledon may also remain underground rather than shooting up as a set of leaves, where it functions as a storage area for food for the plant.
Seeds can have one cotyledon or a pair of cotyledons. Those with one are called monocots, while those with two are classified as dicots. Seeds that are dicots have cotyledons that function as leaves, while monocots have cotyledons that are appendages for food storage. Seeds that store their food in cotyledons inside the embryo are called exalbuminous. Seeds can remain in a dormant state for years, only germinating when conditions are right.Learn more about Botany
Seed germination begins when the first root breaks through the seed wall and ends when the first pair of true leaves begin the process of photosynthesis. The three stages in-between are when the primary root, which is called the radicle, develops root hairs, the first young shoot rises emerges from the soil and the first pair of true leaves form to begin to manufacture food for the plant.Full Answer >
High concentrations of salt in soil generally reduce the rate of seed germination. Increased salt levels prevent essential water from seeping into the seed. The lack of moisture retards its growth and development, which may cause the seed to wilt and eventually die.Full Answer >
Monocot leaves have veins that are parallel, have leaves that are in groups of three, have one cotyledon and have scattered vascular bundles. They are one type of a leaf with the majority of other leaves being dicot leaves.Full Answer >
Seeds have quite a bit packed inside the seed coat, including the endosperm, cotyledon, plumule and radicle; one will also find a hypocotyl or stem in a dicot seed. The terms monocot and dicot refer to the number of leaves a plant has when it first germinates. A monocot has one leaf, whereas a dicot has two, thus the need for the stem inside the seed.Full Answer >