Science – Plants

Year 3 have been learning lots about Plants in Science. They started the term by observing our school environment for different plants and trees. Together the children discussed and developed the key language to describe the key parts of both plants and trees. The children learnt that a flowering plant has roots, a stem, leaves and a flower and a tree has roots, a trunk, branches and leaves. While observing the children also learnt that some trees also have fruit on the branches.

The children have developed their knowledge further by thinking about the lifecycle of plants. They sowed their own cress seeds. Year 3 carefully followed the instructions provided to ensure their cress grew, considering the best place to leave their seeds and how much water they might need.

Together the children discussed whether they think cress seeds actually need light, warmth and air to successfully grow. They decided to set up their own investigation to look into whether these factors have an impact. The children placed cress seeds in the fridge, on the radiator to see the impact of the temperature, on the windowsill and under the sink to see the impact of light and being covered and not being covered to see the impact of air. They agreed that to make sure it was a fair test, the cress would be given the same amount of water and would be planted in the same containers.

Thinking about what they know, the children made predictions on which cress they think will grow the most or not grow at all. Below are some of their predictions.

Aaron: “I do not think the cress in the fridge will grow because it is too cold.”

Angela: “I think the cress on the radiator will grow the most because it is the warmest place.”

Fletcher: “I think the cress on the windowsill will grow the most because it gets light during the day and it is dark at night.”

Kai: “I think the cress under the sink will not grow because it will not much light or air.”

Each day the children closely observed the cress to see what affect the different conditions were having on their growth. Here is the cress three days later. Surprisingly the cress in the fridge did not grow at all! It was interesting to see how the colour had changed on the cress that did not have any light.

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