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Primary 3 Science for October - Life Cycles in Plants


Here's what students can expect for Primary 3 Science for the month of October.

For this month, the school should be completing the topic on Life Cycles in Plants.


There are a few key concepts that they need to know for this topic:

Number 1, both flowering and non-flowering plants have have 3 stages life cycle


Number 2, flowering plants have seeds in their life cycle while non-flowering plants have spores.


Number 3, Germination is the process of a seed growing into a young plant, and the conditions required for germination are Water, Oxygen and Warmth. Students may use the acronym W.O.W to help them remember better. Take note that germination and its required conditions are frequently tested in questions.


Number 4, the plant’s parts growing sequence. The first part that grows out of a plant is the roots (grows downwards) as plants require water to survive, followed by the shoots (grow upwards).


Some students may ask, doesn’t the plant require food to survive? Why is water more important than food?

This is because at this stage, the plant has seed leaves which contains stored food) to provide the growing seedling with food. As the plant grows further, it will use up the stored food in the seed leaves, causing the seed leaves to shrivel and fall off.

When this happens, the seedling would have developed its true leaves, which helps it trap sunlight during photosynthesis and make its own food.

The adult plant then goes on to bear flowers (for flowering plant) that will turn into fruits and seeds. The cycle will then repeat itself again.


Common question type of this topics is general knowledge recall questions which require them to apply the concepts they have learnt.

For instance, let's refer to this question.

In this question, students must understand the stages of development of a plant and use their scientific concepts on the parts of seed to answer the various questions.

For part (a) keyword “observed” means that students must state what can be seen or noticed. In this case, the plant will die.

  • To explain this observation in part (ai), we need to recall the concept – the part that is being removed is the seed leaves, and seed leaves provide stored food for the plant before true leaves develop. Without the seed leaves, the plant will have no food and it will die. Please remember for lower primary science questions, every claim must be backed up with a science concept. In this case, we explain why the plant will die with the science concept “All living things need food to survive.”

  • For part (b), at the third stage, we notice that the true leaves have formed. Now they are removing the true leaves instead of the seed leaves.

  • So to explain why we state that the plant will die, we need to recall the concept – when true leaves forms, it means that the stored food in the seed leaves has been used up, and now the plant has to rely on the true leaves to trap sunlight and photosynthesise to make food.

  • Without the true leaves, the plant cannot photosynthesise and make its own food, without food the plant will die. Further support your answer with science concept: “All living things need food to survive.” for a more wholesome answer.


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