SEEDS

Although not all seeds look the same, there are two main types of seeds—the dicotyledon and the monocotyledon. So, how are we able to tell the seed type? Once the seed has sprouted, count how my cotyledon the seed sprouts. The cotyledon is the leaf stored within the seed and the first leaves seed sprouts. A dicotyledon has two cotyledons while the monocotyledon has only one. Another way to tell is looking at the veins of the leaves of the plants. If the veins of the plant are parallel to each other, this indicates that the plant is monocotyledon. An example of this is a palm tree. If the leaves have netlike veins, this means that the type is a dicotyledon. An example of this is the maple tree. Looking at the flowers produced can also tell you the seed type. If the flower parts and has petals in multiples of three, the plant is a monocotyledon. If flower parts and has petals in multiple of four or five, the plant is a dicotyledon.

Using these indicators, find and draw a monocotyledon and dicotyledon seed, leaf, and flower.

Plants share their offspring as seeds with the world. Unlike animals, which can swim, slide, walk and run to new places, baby seeds are sent off by the wind, carried by the water, or carried by animals to new locations. Some seeds make it to a favorable condition at which to they begin to grow and others do not. Dandelions and milkweeds are seeds carried by the wind. Seeds moved by air have tiny hairs, pods that catch the wind, or are light enough and ‘dust-like’ to be blown hither. Fun wind seeds are the Maple ‘samara wings’ that twirl as they fall! Other seeds float on streams and rivers before washing up to soil to grow. Finally, other seeds have barbs or hooks, or bristles to attach to clothing and fur. Seeds travel for miles to new destinations. Seeds like acorns and nuts are good food sources for animals and are often buried, stashed, and forgotten. In this case, the animals help to ‘plant’ seeds! Some seeds are eaten as food, digested and then eliminated far from the parent plant. Often these seeds are coated in droppings, which add nutrients to aid the seed in sprouting!

Draw three seeds- one carried by air, one by water and one by animals.

Did you know that seeds ‘sleep’? Seeds hibernate or wait to germinate or sprout. Some seeds wait for the right temperature, oxygen, and water conditions. Others are programmed to sprout through chemicals within nature or by humans. Seed ‘sleeping’ is known as dormancy. Some seeds sleep due to their harder coats; others sleep due to internal chemical dormancy. Predictive dormancy and consequential dormancy are two types of hibernations of seeds. Predictive dormancy is when a seed enters dormancy after a sudden environmental change, such as a temperature drop or when sunshine hours lengthen. Consequential dormancy occurs when a seed begins a sleeping period in response to the environment. Seeds then either die, or the change makes the seeds stronger and more productive by keeping the seeds active for longer. If they germinate and grow, the Cotyledon is an inner layer that stores food for the future plant. The Radicle becomes the first root. The Hypocotyl grows into a stem, and the Epicotyl become the first leaves.

Draw and label the parts of a seed and what they do or become. Upload your Seed Worksheet to the gallery!

People all over the world collect, harvest, and save seeds. The majority of saved seeds are for replanting the following season. There is an art to saving seeds. Another reason for saving seeds is to deposit them in a seed bank. Today there are several seed banks around the world dedicated to preserving plant diversity by archiving seeds. To ensure the viability of seeds after years and years of storage, the temperature and humidity of the storage area needs precise regulation. Preserving seeds under controlled conditions can double or even triple the lifespan of seeds. Watch: See inside the Doomsday Seed Bank. Research and virtually visit Seed Banks around the world learning how concerned citizens and farmers are safeguarding food sources for the future. Join the mission and start a seed bank at your school!

Growing seeds is not as hard as you may think it is. You just need a starting pot, seeds, soil, and water! For seeds to grow healthily, you have to make sure that you keep in mind the weather and the season. Seeds successfully grow at different times of the year. The temperature, humidity and hours of sunshine for each season determine the planting and growing period for seeds.

Now let’s look at what each of these parts becomes once the seed becomes a plant. The seed is what will produce the plant. It has a seed coat or cotyledon. The cotyledon is the inner protective layer of the seed that stores food for the seed to use during the process of germination and until the seed comes through the soil and has leaves that can be used for photosynthesis. The radicle is is the first sprout of the seed outside of the seed coat that turns into the beginning of the root. The epicotyl are the parts of the seed that become the first leaves of a plant. The Hypocotyl is the stem of the plant.

Try growing your own seeds and take pictures of the different stages.

• How are you able to tell if a seed is a monocotyledon?
  • the flower petals
  • the leaf color
  • the size of the plant
  • the veins of the flower petals
• What are the three most important components needed for a seed to sprout?
  • day length, moisture, and shadow
  • temperature, season, and nutrients
  • water, temperature, and oxygen
  • nutrients, moisture, and season
• What can cause a seed to go into dormancy?
  • lack of shade
  • sudden change in temperature
  • earthquake
  • being touched
• Seeds can be dispersed by
  • the wind
  • rivers
  • animals
  • all of the below
• Why does the temperature and humidity need to be regulated in a seed bank?
  • to prolong the lifespan of the seeds
  • to keep the seeds from sticking to each other
  • to make sure the seeds do not change color
  • to prevent the seeds from smelling