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
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 >
Temperature affects the percentage of seeds that germinate and the rate of germination. Seeds kept at higher temperatures are more likely to deteriorate and not germinate. Once seeds start to germinate, higher temperatures stimulate faster germination up to an optimal temperature, after which the speed of germination declines.Full Answer >
The seed germination process is a complex process in which the embryonic plant created by sexual reproduction of plants propagates the species by forming a new, independent plant. In order to germinate, the moisture and temperatures must be right. New plants live a short while on the sugars stored in the seed, requiring the plant to start gathering nutrients and moisture from the soil and producing its own food quickly.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 >