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Science

Annie was conducting research on the number of fruits produced by watermelon under different conditions. She grew 25 watermelon plants each in both glass house A and B. She introduced pollinators in glass house A only. 
(a) What difference will she observe in the number of fruits produced in the two glass houses? Explain with reason.
(b) List 3 changes that will occur in a flower once it gets fertilized.

Reproduction in Plants

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Answer

(a) Watermelon plants have unisexual flowers, meaning that male and female flowers are separate.

In glass house A, where pollinators were introduced, these pollinators will help transfer pollen from the male flowers to the female flowers, leading to successful fertilization and hence a greater number of fruits.
In glass house B, where no pollinators are present, the chance of pollen reaching the stigma of the female flowers is very low, resulting in fewer or no fruits being produced.

(b) Three changes that occur once a flower is fertilized are:

The ovule develops a tough outer coat and becomes a seed.
The ovary enlarges and ripens to form the fruit.
The petals, sepals, stamens, style and stigma usually dry up and fall off, leaving behind the fruit that protects the developing seeds.

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