Presentation on theme: "Plant Reproduction and Breeding. What is selective breeding? Choosing specific plants with particular characteristics and encouraging those plants to."— Presentation transcript:
What is selective breeding? Choosing specific plants with particular characteristics and encouraging those plants to reproduce
Plants are also bred to withstand environmental conditions such as: Hardiness Yield Resistance to disease How well it stores Heather, Calluna vulgaris, one of Britain's hardiest plantsCalluna vulgaris
Genetically Modified Plants Scientists combine genetic material from two different plants, so it has genes from both.
Plant Reproduction Asexual reproduction happens when a parent plant grows new plants from its foots, stems, or leaves.
Vegetative Reproduction When young plants are identical to the parents- usually happens when a new plant grows from the root of another. Can also occur through stems
Grafting To take a branch from one tree and attach it to another http://www.youtube.com/watch?v=Xpgbpbe wU3E
Seed Plant Reproduction Female ConeMale Cone -Contains ovules -Catches pollen grains, and once the pollen tube grows down to the ovule, pollination occurs -Smaller -Pollen grains develop on it http://studyjams.scholastic.com/studyjams/j ams/science/plants/flowers.htm
2. Pollination Occurs when pollen has been transferred from the anther to the stigma. When the pollen grain germinates on the stigma it creates a burrow called the pollen tube as it travels toward the ovary http://www.youtub e.com/watch?v=w DM8OtS5MPM http://www.youtub e.com/watch?v=w DM8OtS5MPM
3. When the pollen grain reaches the ovule, fertilization occurs
4. Pollination must take place before fertilization can take place
5. The fertilized embryo will become a tiny new plant inside the seed
Pollination Two types of pollination are self- pollination and cross- pollination
Artificial Pollination When plant breeders breed plants for specific purposes
Once a plant has been pollinated, a seed is formed! Inside the seed is a tiny plant that is called an embryo. It is protected by a seed coat that helps it stay alive or dormant.
What conditions does a seed need to be able to grow? Sunlight Water Air
When you bite into a pear you are eating a fruit! What is the function of fruit for a plant? A fruit is the growing ovary of the plant that swells and protects the developing seeds of a plant until they are ripe.
Name 5 ways that seeds are spread 1. Wind 2. Water (ex. Coconut) 3. Eaten by animals 4. Hitch a ride on animals 5. Fire
Farmers use machines to spread seeds like wheat, canola, barley.
Germination The development of a seed into a new plant. http://studyjams.scholastic.com/studyjams/j ams/science/plants/flowers.htm