OB51 distinguish between asexual and sexual reproduction in plants and describe a way in which a named plant can reproduce asexually
sexual and asexual reproduction
Asexual reproduction only requires one parent, sexual reproduction needs two,
- Only Requires one parent (Mother)
- The offspring (daughters) are genetically the same.
- No variation in genetics leads to no adaptation of species.
- Most plants that can asexually reproduce can also sexually reproduce.
Rare flower appears on tree
OB52 locate and identify the main parts of the flower: sepals, petals, carpel and stamen
The Stamen is the male reproductive organ of the flower (this is easy to remember it has the word men in it). From here the pollen is always on the anther. Through some process the pollen leaves the anther when conditions favour this.
The objective of the pollen is to land on different flower, but of the same species of plant.if this happens pollination will have taken place if the pollen lands on top of the pistil, on a slightly sticky stigma. It then burrows through the style to fertilize the egg that is in the ovary. Pollen tube growth is excellently explained here http://www-saps.plantsci.cam.ac.uk/pollen/pollen2.htm
Parts of the flower
Stamen Male part of the flower (includes the Anther & Filament)
Anther Holds the Pollen
Filament thin part that holds the anther up
Pistil Female part of the flower (Stigma, Carpel & Style)
Stigma Sticky part of the flower that catches pollen
Style Long part of the Pistil, through which the pollen tube grows
Carpel The womb / ovaries of the flower
Petal Bright Petals attract insects to the flower, green petals perform a protection from the wind (petals are delicate)
Sepal Allows the petals to be protected
pollination and fertilisation
OB53 use a suitable flower to identify the stigma, style, ovary, anther and filament
Lillies are probably the best, but if done in spring many examples to be brought in by students.
Sketch and label the flowers,
we'll pick your best
and you redraw that flower with labels
best go on the wall
OB54 understand that the stamen (anther) produces pollen, the carpel (ovary) produces the egg cell, the pollen produces the male gamete for fertilisation, the ovary produces the female gamete for fertilisation, and pollen is transferred by wind and by insects
OB55 recall that seed formation follows fertilisation, and describe seed dispersal
follow this here
OB56 describe seed structure (testa, food supply, radical, plumule)
how seeds are made, and transform into a new plant seeds
OB57 understand that seed germination is necessary to produce a new plant
OB58 investigate the conditions necessary for germination
Germination investigation of conditions necessary for germination