Seeds and Seeds

You must have seen many types of seeds. Some seeds are small and some are large. Seeds of mustard are small, while seed of coconut is quite large. Seeds come in different shapes. Some are round, some are flat and some appear like capsules. Some seeds are smooth while some are rough. Seeds come in many colours.

Germination of Seed

A seed contains a baby plant and some food for the baby plant. When a seed starts to change in a plant, the process is called germination of seed. A seed need proper temperature, water and air to germinate. Following are the steps of seed germination.

• A sprout comes out of the seed. The sprout looks like small hair which is white in colour.
• New leaves come out of sprout. This is the baby plant.
• The baby plant then grows further.

Seeds Travel

Seeds travel far and wide. This helps them to produce plants in new areas. Different seeds travel by different methods.

Fig: From left to right: Seeds of dandelion, maple, beggar tick and coconut

• Seeds of dandelion travel by floating on air. A seed of dandelion has fine cotton like hairs on top. These hairs help it in floating on air.
• Seeds of maple have wings on them. They fly in air with wings.
• Seeds of beggar tick have hooks all over. These hooks help the seed in sticking to fur of an animal. That is how a seed of beggar tick travels to different places.
• Some seeds are spread by birds and other animals. When a bird eats a fruit, it drops the seeds at different places.
• A seed of coconut floats on water. That is how, coconut seeds travel to different places.
• Some seeds are spread by humans. Once upon a time, potatoes were grown only in South America. Potatoes traveled to different countries along with traders. Now, potato is grown all over the world.

Chillies also came from South America. Cabbage came from Europe. Bhindi or okra came from Africa.

Activity

• Take some chana (gram) and three bowls.
• Put five grains of chana in each bowl.
• Fill the first bowl with water. Put a damp piece of cloth in second bowl. Keep only chana seeds in the third bowl.
• Observe after a week and note the changes in the bowls

Conclusion: Both water and air are necessary for germination of seeds. A seed cannot germinate if any of the two is not available.