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Life in the Garden: how do plants populate their environment (1)?
Thursday 8 May 2008
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Le Lys {JPEG}Life in the Garden: how do plants populate their environment (1)?

Flower Plant Breeding.

NOTIONNAL OBJECTIVES :

To know that flower plants populate their environment thanks to:

- the seed production stemming from the transformation of the ovules contained in the pistil
- the scattering of fruits and seeds with the help of animals, wind or water

MATERIALS :

- flower plant inflorescences (flowers in buds, in full bloom, faded, with fruits…)
- scalpel
- colouring pencils
- pots filled with compost or vermiculite, wheat or soya seeds

PROCEDURES :

Use the following worksheet:

1. Dissecting the flower

“The flower is made up by

- protective green sepals,
- petals,
- stamens containing pollen seeds
- pistil containing ovules.

Read the text, identify the different floral sections of the flower proposed as sample.

Remove
- 1. the sepals,
- 2. the petals,
- 3. the stamens so as to free the pistil.

With a scalpel, cut the pistil in length and observe the ovules.

Caption the lily photo above with the underlined words of the text.

2. The transformation stages of the flower into fruit

Find these stages back by creating a flower plant herbarium (cf. track Life in the Garden: how to create a herbarium). Make the following captions match with the different sections of the flower plant: flowers in bud, young fruits, faded flowers, mature flowers freeing seeds.

3. The seed evolution

Grow wheat, bean or soya seeds in a solid environment. After two days, what do you notice?

Make a transversal cut of the sprouted seeds. Make a drawing observation captioned with the following words: reserve tissue, young germ, seed husk.

ASSESSMENT :

Explain the transformation of the flower into a fruit by completing the text below with the words “seeds, pollen, fruits, wind, animals, pistil:

“For a flower to transform into a fruit, the … freed by the … must be carried (by the … or the …) to the …. The pistil grows and transforms into … containing the ….


Jean-Michel Josse professeur de Sciences de la Vie et de la Terre, Lycée Français Charlemagne de Pointe Noire, Congo Brazzaville

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