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Essential Question: What are the functions of the structures of flowering plants?
Structures for Defense
- These structures protect plants from threats.- Without these structures plants might die.- Examples:
Thorns that defend plants from being eaten.Fruits and leaves with poisons so they are not eaten. Thigmotropism: ability to close its leaves when
touched
Structures for Survival
- Allow plants to survive in habitats when the conditions are not suitable. - To obtain water = Roots- To catch sunlight to make food = Leaves- To stand up to the Sun = Stems- To reproduce = Seeds
Leaves- 3 processes happen here:
1- Photosynthesis (Making sugar)2- Respiration (Turn sugar into energy) 3- Transpiration (Releasing water through the leaves)
Stems- These structures support the plant and hold the leaves up to the Sun. - Stems also store food.- Xylem and Phloem move water and food here.
Roots- These structures:anchor the plant in the ground store extra food.absorb water and nutrients from the soil.- The more area the roots can take up then the more water and nutrients it can absorb. Root hairs help increase the surface area a plant can cover.
Roots- Two types:Fibrous roots: consist of several main roots that branch off to form a mass of roots.Ex: grass, corn, and some trees.Taproots: one large, main root with smaller roots branching off. carrots, dandelions, or cacti
Seeds- Have special structures that allow them to be dispersed by wind, water, or animals. - The seed coat helps protect the embryo from injury and also from dying out.
Structures for Reproduction
Seeds form when the pollen joins with an ovule through the process of pollination and fertilization.
Flowers
- Site of pollination and fertilization
- Produce seeds here - Have both male and female parts- Are colorful or have a scent to attract insects and other animals
Stamen
- The male part (2 parts)- Anther: Makes and holds pollen - Filament: Holds pollen up on anther to reach pollinators
Pistil
The female part ( 3 parts)- Ovary: contains the ovules where the egg cells are produced.- Stigma: sticky top where pollen grains land.- Style: a stalk/tube which connects the stigma to ovary
Seeds- When pollen combines with an ovule it creates a fertilized egg = seed = baby plant- A fruit can form around the ovary to protect it.
Flowering Plant Structures
Defense Survival Reproduction
ThornsPoisons
Thigmotropism
LeavesStemsRootsSeeds
Flowers Stamen
(Anther/Filament) Pistil (Ovary, Stigma, Style)
Seed
http://studyjams.scholastic.com/studyjams/jams/science/plants/flowers.htm
Label the parts of the flower.
Summary: 5 - 6 Sentences answering the Essential Question.
Flowering Part Clay Sculptures*Make a sculpture of the flowering parts. Make sure to include all the parts of the STAMEN and PISTIL.
*Use the diagram to help you make your sculpture.
Stamen PartsPicture
Pistil PartsPicture
Which of the following statements is true?
A. Xylem is found in roots, and phloem is found in leaves.B. Xylem carries water through the plant.C. Phloem in the leaves is needed for reproduction.D. Phloem in the roots connects to xylem in the stems.
Sexual reproduction in plants takes place in_______________
A. rootsB. stemsC. leavesD. flowers
What is the male reproductive structure of a plant?
A. stamenB. pistil.C. ovary.D. petal.
Why are fruits important for flowering plants?
A. Fruits save and protect seeds for fertilization.B. Fruits contain seeds that will develop into new plants.C. Fruits give the plant food.D. Fruits attract pollinators.
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