Pollination and fertilisation in flowers GCSE

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Information about Pollination and fertilisation in flowers GCSE
Science

Published on May 6, 2014

Author: dhruvsheth2

Source: slideshare.net

Description

A presentation about the pollination and fertilisation processes that take place in a flower.

Reproduction in Flowering Plants

Flower • Sexual reproductive structure • Produces egg and sperm • Fertilization takes place inside the flower

Pistil *Stigma –top of the pistil, Sticky surface for pollen to stick to *Style – connects the stigma to the ovary *Ovary –contains ovules ( eggs) Stamen *Anther – produces male nuclei enclosed by pollen grains. *Filament – holds the anther up Female reproductiv e organ Male reproducti ve organ

Pollination Self-pollination • Pollen from the anther is transferred to the stigma

Cross Pollination • Pollen from the anther of one plant is transferred to the the stigma of a different plant

• When a pollen grain lands on the stigma, it germinates and a pollen tube grows down through the style to an ovule (egg)

• The ovary and fertilized ovule develop and ripen. *The ovule forms the seed and the ovary forms the fruit. • A fruit is a ripened ovary

The plant embryo uses food stored in the cotyledon of the seed until it develops leaves for photosynthesis

Wind/Insect Pollination

Feature Reason small petals, often brown or dull green no need to attract insects no scent no need to attract insects no nectar no need to attract insects pollen produced in great quantities because most does not reach another flower pollen very light and smooth so it can be blown in the wind anthers loosely attached and dangle out to release pollen into the wind stigma hangs outside the flower to catch the drifting pollen stigma feathery or net like to catch the drifting pollen Wind Pollinated Flowers

Feature Reason large, brightly coloured petals to attract insects often sweetly scented to attract insects usually contain nectar to attract insects moderate quantity of pollen less wastage than with wind pollination pollen often sticky or spiky to stick to insects anthers firm and inside flower to brush against insects stigma inside the flower so that the insect brushes against it stigma has sticky coating pollen sticks to it Insect Pollinated Flowers

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