Explore the Life Cycle of Plants

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Seed Development Researchers

Have you ever tasted a sweet strawberry as big as your palm called Kingsberry? Have you seen mini cabbage, which is smaller than regular cabbage but sweeter and softer? What about Dangjo pepper? It’s bigger than a normal chili, not too spicy, and it may help lower blood sugar.  Kingsberry, mini cabbage, and Dangjo pepper are new types of plants developed in South Korea.


Kingsberry

mini cabbage
Photo courtesy: Korea Agro-Fisheries & Food Trade Corporation( kati.net )

Dangjo pepper
Photo courtesy: Hyeon-Jeong Suk at flickr.com
) is the process of making or improving new kinds of plants by using the genetic traits of living things. For example, if you want to make a new kind of cabbage that is both tasty and strong against pests, you can mix two cabbages, one that tastes good and one that strong against pests. The new cabbage will have both good traits — this is called breeding. Breeding takes a long time and needs to be studied again and again. Thanks to advances in genetic engineering, scientists can now use advanced bio-technology in breeding to create more kinds of plants. Dr. Woo Jang-chun, a famous plant breeder from South Korea, showed that it is possible to mix different plants, like cabbage and Chinese cabbage, to make a new kind of plant. His research also helped improve Jeju tangerines, develop potatoes that grow well in Gangwon Province, and create cabbages that are good for making kimchi. However, most of the crops we eat today are grown from seeds developed in other countries. That means we have to pay to use those seeds. For example, most onions sold in South Korea are from Japanese seeds, and most paprika seeds come from the Netherlands. If we develop our own seeds with different good traits, we won’t need to pay other countries. A person who develops new seeds with the taste, texture, color, and shape that people like or seeds that are strong against diseases, is called a ② . How about becoming a seed development researcher yourself and creating a new kind of fruit or vegetable that you like?

Dr. Woo Jang-chun(1898~1959)
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How Seeds Germinate

Explaining the Conditions for Seed Germination

To find out what seeds need to sprout, we did two experiments.

In Experiment 1, we observed beans that were soaked in water and beans that were not soaked for 4–5 days.
In Experiment 2, we took beans that were soaked in water. Some were kept at room temperature (about 15°C) and others were placed in a refrigerator. We observed them again after 4–5 days. Based on the results of these experiments, explain what conditions are needed for seeds to germinate. 


[Experiment 1] Beans soaked in water vs. beans not soaked

[Experiment 2] Beans kept at room temperature vs. in the refrigerator
Conditions for Bean Germination

Seeds need ③ to sprout, and they do not germinate in temperatures.

Thinking Like a Scientist

Why didn’t the lotus seeds, buried underground for 700 years, sprout?

In 2009, the National Gaya Cultural Heritage Research Institute discovered 10 lotus seeds underground in an old pond at Seongsan Fortress in Haman. Carbon dating showed that the seeds were from the Goryeo Dynasty, about 700 years ago. When they planted the seeds, some of them sprouted and a lotus flower with a different shape and color bloomed. This special lotus was named “Ara Hongryeon.” The reason these seeds didn’t germinate for 700 years is that they were preserved in vacuum-like state inside the mud. Furthermore, the seeds’ thick, hard and coated shells prevented ⑤ from entering, which stopped the seeds from sprouting.

Photo : Haman County Office

How to Store Seeds

Write about how we keep seeds from sprouting over long periods.

The Svalbard Global Seed Vault in Norway and the Baekdu Daegan Seed Vault in South Korea store seeds from many kinds of plants to protect them from extinction caused by natural disasters or wars.
At the Svalbard Global Seed Vault, seeds from around the world are dried by removing oxygen and water, then vacuum-sealed in aluminum bags, and stored in black containers at -18°C. The Baekdu Daegan Seed Vault keeps wild plants seeds from around the world at -20°C and under 40% humidity. When the temperature is  ⑥ (low, high) and the humidity is ⑦ (low, high), seeds can be stored for a long time without sprouting. Vacuum-sealed aluminum seed pouch.

The Svalbard Global Seed Vault
Photo : Global Crop Diversity Trust at flickr.com
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The Life Cycle of Plants

Activity 1

Please follow the instructions and assemble the educational kit in the order specified.

Activity 2: Write About the Characteristics of the kidney bean’s life cycle.

1. Seed > ⑧ come out of the seeds.>
2. The ⑨ and ⑩ grow. >
3. The ⑪ ) blooms. >
4. It grows ⑫ .

Activity 3. Compare the life cycles of annual plants (corn) and perennial plants (persimmon trees)


Life cycle of corn (annual)

Life cycle of persimmon trees (perennial):
Observe the life cycles of corn and persimmon trees, and classify apples, rice, pumpkins, and rose of Sharon as annual and perennial plants. Annual plants : ⑬ Perennial plants : ⑭

Apple

Rice

Pumpkin

Rose of Sharon