Year 8 Biology Flower reproductive system Year 8

Year 8 Biology Flower reproductive system

Year 8 Biology Flower reproduction

Year 8 Biology

Year 8 Biology • • • stamen - the male reproductive organ of a flower anther - the part of the stamen that contains pollen; usually borne on a stalk pistil - the female ovule-bearing part of a flower composed of ovary and style and stigma style - (botany) the narrow elongated part of the pistil between the ovary and the stigma - the apical end of the style where deposited pollen enters the pistil ovary - the organ that bears the ovules of a flower ovule - a small body that contains the female germ cell of a plant; develops into a seed after fertilization placenta - that part of the ovary of a flowering plant where the ovules form placentation - arrangement of the ovules in the placenta and of the placentas in the ovary

Year 8 Biology Wind-pollinated Flowers • These flowers are often small and inconspicuous since they do not need to attract insects. • They do not produce nectar and they do not have any scent. Most trees and grasses have wind-pollinated flowers.

Year 8 Biology Insect pollinated • Some of these flowers have a simple structure and can be pollinated by many different types of animals. Other flowers have a more specialized structure and depend on one type of insect, or another type of animal, to pollinate them. • The buttercup is a good example of simple flower structure. The petals are shiny yellow and have lines on them which lead the insects towards the nectaries. These lines are called `guidelines" because they guide the insect towards the nectar. • Each buttercup flower has many stamens. When these are mature they stand upright with the anthers open. Each pollen grain is sticky and spiky which makes it easier for it to be picked up by the hairy bodies of the insects as they walk over the flower

Year 8 Biology

Year 8 Biology Differences

Year 8 Biology Links • http: //library. thinkquest. org/C 01180 22/pollination. htm