The Structure of a Flower Information Sheet
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- Marilyn Parrish
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1 The Structure of a Flower Information Sheet Petals stigma Stamen anther Carpel male part female part of the of the flower filament ovary flower sepal stalk The Stamen Carpel The male part of the flower The female part of the flower Anther (contains pollen) filament Stigma Ovary Will swell to produce seed and fruit adapted from material from SAPS for the ASE/NASEN CD ROM. This document may be photocopied for educational use in institutions taking part in SAPS activities.
2 Looking at Flowers - Instructions Find a plant with lots of open flowers on it. Carefully remove one of the flowers with a bit of the stalk. Fix it in a rubber bung holder. cut Flower Rubber bung Look at the structure of the flower using a hand lens or magnifying glass. adapted from material from SAPS for the ASE/NASEN CD ROM. This document may be photocopied for educational use in institutions taking part in SAPS activities
3 Looking at Flowers Student recording sheet 1. How many sepals are there? 2. What are the sepals for? 3. How many petals are there? 4. What are the petals for? 5. Are the petals joined to form a tube or are they separate? 6. How do you think your flower attracts bees and other insects to come and pollinate it? 7. Find the stamen : How many stamens are there? 8. Does your flower have a carpel? How many does it have? 9. Look at some different flowers. Describe or draw them. How have they adapted for insect pollination? adapted from material from SAPS for the ASE/NASEN CD ROM. This document may be photocopied for educational use in institutions taking part in SAPS activities.
4 SAPS sequencing pictures or data interpretation (showing the plants after 3, 7, 11, 16, 21 and 22 days) adapted from material from SAPS for the ASE/NASEN CD ROM. This document may be photocopied for educational use in institutions taking part in SAPS activities.
5 Student Sheet A model Brassica flower Read these instructions carefully before you start. You will need: 250ml and 500ml bottles, Velcro, 1 sheet A4 green card, 5 sheets A4 yellow card, 3 ping pong balls, 6 'whotsits' type packing material, 6 pipe cleaners, 4 wire twists, cardboard tube. 1. To make the pistil: Cut a 250 ml plastic bottle, which has a 6-dimpled based, as shown by the dotted line. Stick 3' pads of 'Velcro' (hooked side) inside the bottle, opposite the window. Stick hooked 'Velcro' pads and strips on the base of the bottle as shown Cap = stigma Base of bottle Cut out window Velcro pads (inside) velcro strips (x6) to attach stamens velcro pads (x3) to fit on receptacle 2. To make the ovules: Stick a 'Velcro' pad (fluffy side) on each of three table-tennis balls or three 3-4 cm diameter polystyrene spheres. Ovule Polystyrene or table-tennis ball Velcro pad
6 3. To make the 6 stamens (4 long (12cm) and 2 short (6cm)): The anther = rice-starch 'whotsit'-type of packing granule; the filament = pipe cleaner with 'Velcro' pad (fluffy side) at one end. Stick them onto the hooked 'Velcro' strips on the base of the pistil bottle. Packing granule (= anther) Pipe cleaner (= filament) Velcro pad stick 2 bits back to back to improve adhesion 4. To make the receptacle and pedicel: Cut the top section from a 500ml plastic bottle. Stick 3 'Velcro' pads (use fluffy 'Velcro' pieces) on the inside of the bottle to attach the pistil bottle. Stick 4 'Velcro' pads (fluffy side) on the outside of the bottle to attach the sepals. 3 fluffy Velcro pads Cut round here 4 fluffy Velcro pads 5. Attach four 2 cm x 1 cm strips of fluffy 'Velcro' pads, for petals, between pads already attached for sepals, allowing strips to extend to bottle opening. 4 fluffy Velcro strips Velcro pads for sepals 6. Stick the 3 ovules inside the pistil bottle. Stick the 6 stamens onto the outside of the pistil bottle. Pistil bottle stamen ovule
7 7. Attach the completed pistil bottle to the inside of the receptacle. stamens pistil receptacle 8. Prepare petals and sepals cut out of paper or card (see the shapes in the diagram). 9. Attach the 4 petals to the outside of the receptacle. Then attach the 4 sepals to the outside of the receptacle. pistil petal sepal 10. Take a 15cm long cardboard tube of suitable diameter and push the neck of the receptacle into the tube. 11. The flower is now assembled. When sticking 'Velcro' pads onto the different parts of the model, make sure they will stick to their corresponding attachment pads. Acknowledgements to Dr Barry Meatyard, Institute of Education, University of Warwick. Artwork by Linda Gray. SAPS ASE/NASEN CD ROM.
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