This term our Science topic is “Plants in Action”.
In this unit students will have their beliefs about flowering plants challenged by working through hands-on activities. Students will develop a sense of wonder and appreciation of plants as we investigate the following:
- the stages in a plant’s life cycle
- what plants need for growth
Today we undertook our first experiment for the term called ‘What’s inside a seed?’
We began the lesson by asking the question ‘are seeds living or non-living?’ Most students believed that seeds are a living thing, a small group could not decide if seeds were living or non-living and one student thought seeds were non-living. Below are some of the reasons why:
|They can grow into a plant.How can it grow if it was not alive?There would be no vegetables and trees because if a seed was not living then it would not grow into trees or plants.
Seeds need food like fertiliser and water just like humans and animals and they are living.
If a seed is not living it cannot come to life.
|If you don’t water the seed it will not grow so it’s not living, but if you water the seed, the seed will grow so it’s then living.Seeds grow when they are planted in the ground so they are living, but they don’t when you leave them in a packet so they are then not living.||Because they do not move or grow without help from water or fertiliser.|
We then worked in teams of 3 to find out what was in a broad bean seed. Each group had 1 broad bean seed that was dry and another broad bean seed that had been soaked in water overnight. We had to compare both seeds by observing the texture, size, smell and shape of both seeds.
We discovered that the seeds that had been soaking were larger in size than the dry seeds. We also found out that when the seed had been soaking, a small sprout had begun to grow overnight.
This investigation helped us understand that this stage of a plants life is the beginning of Germination. We also learnt that a seed is living. Inside each seed is an embryo which is dormant. When the seed is given some water and planted, it triggers the embryo and a sprout appears.
We are looking forward to planting our own seed next week and watching it grow.
What did you find interesting about the dry seed or the soaked seed?
What did you learn from the experiment?
What would you like to investigate next about seeds or plants?