What are Angiosperms
Plants with flowers, and the flower is their reproductive structure and they contain male and female systems.
Are most plants diploid or haploid
Most flowering plants are diploid.
What takes place within the reproductive tissues
Meiosis takes place within the reproductive tissues and produces haploid spores which contain the gametes.
What is the male gamete
Male spores are pollen grains, produced in the anther.
What is the female gamete
The female spore is the embryo sac, produced in the ovule, in the ovary.
What is a hermaohrodite
A flower that contain both male and female parts.
How can species of flowers have variety in their appearance.
A flower is four sets of modified leaves arising from the receptacle base of the flower.
What is the outermost ring
Calyx, which contains the sepals. They usually green and protect the flower in the bud, although in some flowers, the sepals are coloured.
What is inside the sepal
Corolla, a ring of petals. These range from absent to small and pale green to large and brightly coloured. There may be a nectary at the base, releasing nectar which is scented and attracts pollinators, such as insects.
What is inside the petals
Inside the petals are the male parts of the flower, the stamens.
What does each stamen consist of
Consists of a filament supporting an anther, which produces pollen grains.
What does the filament contain
Vascular tissue, which transports sucrose, mineral ions and water to the developing pollen grains.
What does the anther contain
The anther usually contains four pollen sacs arranged in two pairs, side by side. When mature. the pollen sacs dehisce, which means they open and release the pollen.
What is at the centre of a flower
At the centre of the flower is one or more carpel.
What are the female part of the flower
The carpel, which is in the centre of the flower.
Describe the structure of the carpel
Each carpel is a closed structure in which one or more ovules develop. The lower part of the carpel, surrounding the ovules, is the ovary and at its tip bears the style, which ends in a receptive surface, the stigma.
