FLOWER LAB

 

Class brainstorm:

Angiosperms                            ovary               fruit                enclosed seed

 

 

Cotyledons                              Monocot                      dicot

 

 

Fill out as much of the diagram below before you start to dissect your flowers. Then using forceps and/or a dissecting scope, start at the first whorl of the flower and work inward locating each of the parts. Write a brief function for each part near the label.

 

Take the female section of the flower. Shine a black light on the flower. Do you see anything interesting? Now cut the female structure in half and observe under the black light. Observations and sketch if helpful:

 

 

 

 

Diagram of generic flower and structures

Peduncle      receptacle     stamen      petal   sepal    petals   stamen    filament    anther     carpel     pistil   ovary     stigma    style     ovules     placenta  

 

 

 

Go outside and pick a few different types of flowers with mature pollen or used store bought. Try to pick a monocot and a dicot to mix it up. Take a picture or draw a sketch of your flowers and identify if it is a monocot or dicot.  

 

 

What reproductive differences stand out for Angiosperms from conifers?

 

Remove the epidermis of the onion (that thin layer of cells that peels away between layers of onion bulb) in strips and lay it down with inner side facing upwards on microscope slides. Dab the pollen from one flower onto the exposed inner surface of the onion epidermis. Label the slide!! Place your slide in a humid box lined with moist paper towel. Return at lunch or after school to take pictures or draw sketches of some of the pollen grain. Come back the next day at lunch as well. What do you see growing? Label all structures seen in one of pictures or sketches below. Hint: look closely at the interior of the elongating section. J What do you see? How many? Why are there more than one of these?

 

 

Make a data table for sketches of your pollen grains from at least two different flowers for at least 3 different times. Be sure to label the times.

pollen : monocot or dicot, observations.

Time  (O hr)

Time ( 4 hours)

Time ( 24 hours)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Familiarize yourself with following diagram and descriptions