Download Lab Worksheet - Flowers, For Me!

Name _____________________________________
Subject __________________, Period ____ Teacher __________________
Texas High School
Date ____________
Lab Worksheet – Flowers, For Me!
Part A: Stems
Pour a small amount of the food coloring in water into your test tube. Snip off the bottom of
the white flower your teacher has given you (you need a freshly cut surface on your stem for this
part) and place the flower into the test tube. Let this sit until the end of class. What do you see?
________________________________________________________________________________
________________________________________________________________________________
Part B: A “Typical Flower”
Flowering plants belong to the class angiospermae which is subdivided into two subclasses,
____________________________ and ____________________________. Monocots usually
possess flower parts in multiples of _____________________. Dicots have flower parts in multiples
of ______________________ or ____________________.
Flowers specialize in sexual reproduction. They grow from a flower stalk called a pedicel.
The floral parts are inserted in the receptacle. A complete flower has four rings of floral parts. The
outer ring of floral parts if formed by several leaf-like structures called ______________________.
These are usually, but not always, green. This ring of parts acts as a wrap which protects the
developing bud. The next ring of parts are the ______________________ which are brightly
colored to attract pollinators.
The center of the flower contains the female reproductive structure, the ________________.
Surrounded by the male reproductive structures, the ____________________________. Each
stamen has a slender stalk or _________________________ with a sac at the top called an
__________________________.
The female flask-shaped carpel has a swollen base or _________________________ which
contains _______________________, later to become seeds.
Part C: Flower Variation
Not all flowers are “typical”. Flowers with both male and female parts are
___________________ flowers. Flowers with only male parts are called _____________________
flowers. Flowers with only female parts are called _______________________________ flowers.
Symmetry is a characteristic used by botanists to help identify flowers. Some flowers are
radially symmetrical (can be cut in half many ways to will still produce two identical halves), other
are bilateral (can only be cut one way to produce two identical halves).
Name the kind of symmetry exhibited by each of the following.
1. ____________________________
2. ____________________________
Flowers of plants in the Sunflower Family (Compositae Family) appear to be single
blossoms, but are actually like a bouquet of flowers. If you examine a daisy closely, you would
notice many small tube-shaped flowers in the center. These are called disc flowers. Along the
margin of a daisy are strap-shaped ray flowers. Sometimes composite flowers have only ray or only
disc flower types. A thistle is an example of a composite flower consisting of many disc flowers,
but not ray flowers.
Label each flower type.
1. _________________________________
2. _________________________________
Part D: The seed.
A seed is, in one sense a packaged plant. Everything a plant needs to begin growing is inside
this “package”. Seeds typically consist of an embryo, stored food, and a seed coat. Angiosperms
with two cotyledons are ___________________________ while those with one cotyledon are
________________________________.
On the concave side of a bean is an oval scar called a hilium which is where the seed was
attached to the ovary wall. A tiny pore found near one end of the hilium is the opening in the ovule
wall where the pollen tube grew through called the microphyle.
Inside the seed is the embryo plant.
Label the seed.
Part E: Examples
1. Draw and label your first flower here.
Flower
Leaf
2. What color are the petals?
3. How many petals does this flower have?
4. The flowers are (ray flowers, disk flowers, both ray and disk flowers).
For questions 5 & 6, look at the information on the last page.
5. The veins in the leaves are (parallel, branching).
6. The leaf arrangement is ____________________________.
7. This flower is (complete, staminate, pistilate).
8. How many ovules does this flower have?
9. Is this flower a monocot or a dicot? Explain how you know.
10. Draw and label your second flower here.
Flower
11. What color are the petals?
12. How many petals does this flower have?
13. The flowers are (ray flowers, disk flowers, both ray and disk flowers).
Leaf
For questions 14 & 15, look at the information shown below.
14. The veins in the leaves are (parallel, branching).
15. The leaf arrangement is ___________________________________.
16. This flower is (complete, staminate, pistilate).
17. How many ovules does this flower have?
18. Is this flower a monocot or a dicot? Explain.
19. Angiosperms are the most successful group of plants on Earth because of their many
adaptations. List one adaptation of the plant parts observed in lab today and explain how it has
made angiosperms so successful.
Leaves:
Stems:
Seeds:
Flowers:
Veins:
Leaf arrangement: