Flower and Pollen Tube

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Student Exploration: Pollination: Flower to Fruit

Vocabulary: anther, cross pollination, filament, fruit, nectar, ovary, ovule, pedicel, petal, pistil, pollen, pollen tube, pollination, receptacle, self pollination, sepal, stamen, stigma, style

Prior Knowledge Question (Do this BEFORE using the Gizmo.)
Plants use sunlight to produce sugar. Flowering plants make some of this sugar available to animals in the form of nectar (a sweet liquid found in flowers) and fruit.

1. Why do plants provide bees, butterflies, hummingbirds, and other animals with nectar?

So they can be pollinized by them.

2. Why do plants provide animals with fruits such as strawberries, apples, and mangoes?

So when their taking them the nutrients can be recycled for the plants.

Gizmo Warm-up
Plants don’t produce nectar and delicious fruit just to be nice. As you will learn, bees and other pollinators play a critical role in helping plants to reproduce. Fruits play a role in allowing plants to spread to new locations.

The Pollination: Flower to Fruit Gizmo™ will take you through the reproductive cycle of flowering plants. To familiarize yourself with some of the parts of a flower, begin on the IDENTIFICATION tab.

1. Look at the list of Flower Parts on the left. Which of these parts have you heard of before?

Petal

2. On the Closed view, drag the Petal, Pedicel, and Sepal terms into the correct spaces. (Use trial and error.) Turn on Show information about selected parts of the flower.

A. Which structure protects a maturing bud? Sepal

B. Which structure is a stalk that supports a single flower? Predicel

|Activity A: |Get the Gizmo ready: |[pic] | | |On the IDENTIFICATION tab, select Opened view. | | |Flower anatomy | | |

Goal: Identify the parts of the flower.

1. Label: Drag the terms you have learned so far (Petal, Pedicel, and Sepal) into the diagram of the opened flower. The text at the top should say “Current status: 3 correct out of 14.” Add these terms to the diagram below.

Opened view

[pic]

A. The receptacle is a cup-like structure that holds the flower. Label the receptacle on the Gizmo and then add this term to the diagram above.

B. The male part of the flower is called the stamen. It consists of two structures, a long, thin filament topped by an anther. Label these three structures in the Gizmo, and then add these terms to the diagram above.

C. The female part of the flower is called the pistil. It consists of a sticky top surface called the stigma, a shaft called the style, and an ovary that encloses small structures called ovules. Label all five parts in the Gizmo and in the diagram above.

D. Male sperm cells are contained within pollen grains. After a pollen grain moves from the anther to the stigma, a pollen tube grows through the style to an ovule. Label the last two structures in the Gizmo and in the diagram above.

If the current status now reads “14 correct out of 14,” then congratulations! You have identified all of the flower parts correctly. If not, revise your labels until they are correct.

(Activity A continued on next page)
Activity A (continued from previous page)

2. Identify: If necessary, turn on Show information about selected parts of the flower, and read the information for each part. Identify the following parts from their descriptions.

A. These grains contain male gametes (sperm cells): pollen

B. This structure contains female gametes (egg cells): ovule

C....
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