8B Key Knowledge (Sexual reproduction in plants (A part of the plant forms…
8B Key Knowledge
Sexual reproduction in plants
Sexual reproduction needs two parents to produce gametes.
The gametes fuse to produce a zygote.
The zygote then becomes an embryo
Gametes are produced by reproductive organs.
In plants gametes are inside flowers.
Offspring from sexual reproduction contain characteristics from both parents, which is inherited variation.
Pollen grains made in the anther are carried by the stigma.
Carrying pollen to another stigma is called pollination
Once on the stigma, a pollen tube grows a Pollen Tube which enters the ovule containing an egg cell. The nucleus from the male gamete inside the pollen grain joins with the nucleus inside the egg cell to form a Zygote. This is called fertilization. The Zygote grows into an embryo and the ovule becomes a seed, containing the embryo and food store.
A part of the plant forms a fruit, which is used for seed dispersal, that stops new plants competing with the parent plants for water, nutrients, light and space.
Some fruits are eaten and come out in animals faeces.
Some fruits carry on animals fur
Some fruit are carried by the wind
Some fruit explode, scattering the seeds.
When conditions are right seeds germinate.
All organisms are classified into groups.
The plant kingdom contain:
cell walls made from cellulose
Each kingdom is subdivided into smaller groups.
The last two are Genus and Species
Asexual reproduction in plants
Some plants reproduce through asexual reproduction
Only one parent plant is needed to produce offspring
biodiversity should be preserved because:
Organisms are Interdependent
Biodiverse areas recover better from natural disasters