Pollen germination
To show pollen germination.
Cosa imparano gli studenti
La scienza alla base di questo esperimento
In angiosperm plants, petals have the primary function of attracting insects to serve as pollinators. After landing on the stigma, or tip of the pistil, the pollen germinates to form a pollen tube, which penetrates the tissues of the style and ultimately enters the cavity of the ovary.
Attrezzatura utilizzata
- Petri dishes — 1253.00
- Filter paper — 8349.20
- Pinzette — 8261.30
- Microscope slides — 1388.00
- Microscope — 8542.12
- Pollen
Sostanze chimiche e reagenti
- Acqua distillata
- Development solution
Note sulla sicurezza
Domande per gli studenti
- Describe what you see over time.
- Can you make a hypothesis about what causes pollen germination?
- What are the main ways of pollen distribution?
- Describe briefly how the pollen tubes contribute to fertilisation.
Cosa aspettarsi
<p>Time after time an increasing number of pollen granules develops tubes.</p><p>Some pollen germinates in 510 minutes and continues to lengthen for an hour.</p><p>Pollen lands in many places but germinates only on the stigma of the ovary.</p><p>Boric acid and sucrose solution emulate this favourable environment.</p><p>Wind and insects are the main agents responsible for pollination but also birds and water.</p><p>During evolution plants developed several methods to ensure cross pollination.</p><p>If pollination succeeds, the pollen tube grows from the stigma, penetrating the tissues of the style, to the cavity of the ovary.</p><p>In the ovary the pollen tube enters the ovule and deposits haploid sperm cells in the embryo sac.</p>
Smaltimento
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