Blog post #10

1. a plant that has flowers and produces seeds enclosed within a carpel. The angiosperms are a large group and include herbaceous plants, shrubs, grasses, and most trees. 

   

   The yellow thing that seem or looks like it’s cut open is called an anther which is where the meiosis takes place producing male gametophytes.

   

   This is a picture of the stigma and the carpel. The very top is called the stigma, where pollen lands and the carpel also know as pistil what produce female gametophytes.

   

   This is a picture of of the inside of an ovary and the clear, water drip look things are ovules.
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Anthers and Stigmas and Styles, Oh My! -Sayra

Anthers and Stigmas and Styles, Oh My!

To begin, fertilization is when the female gamete is in the process of fusion which can be the ovum or egg and then the male gamete made in the pollen tube by the pollen grain. Everything starts of with the pollen and seed cones. The pollen cones are for the males while the seed cones are for the females. Pollen grains are made from the pollen cones. For the female, the seed cones, there are thousands of cells to be found. Pollen goes into the stigma and starts to germinate in order for the sperm to reach the egg. After the tube grows, it reaches the ovule. Lastly, double fertilization occurs and then everything is complete.

This shows the picture of the flower before the petals were taken off in order to dissect it.

The stem looking part is called the filament while the top yellow tips that are at the end of the stalk are called the anthers.

Here we see the carpel with the pointy top called the stigma and that is where the pollen grains get stuck.

This shows the ovary which has one or more ovules where the gametophytes are produced.

Anthers and Stigmas and Styles, Oh My!- Jenny

       How do flowering plants reproduce? Flowering plants reproduce in a similar yet different way to how humans reproduce.

This is a picture of the flower before we dissected it. The full flower was far to large to fit into the small screen of the microscope.

This is the stamen, the male reproductive anatomy of the flower. Specifically the anther and filament. The anther is the yellow curled part near the left of the picture. This is the oval sac where meiosis takes place. During meiosis, haploid male gametophytes are produced- pollen grains (pollen). This part of the flower also releases the pollen grains. The filament is the green stem-like things near the right of the picture. This part of the flower supports the anthers.

This is part of the carpel. The bottom-most shape in the picture is called the stigma. The stigma is where pollen grains frequently land. The pollen adheres to the stigma, meaning it gets stuck to this part of the flower. The stalk of the stigma is called the style.

The left-most part of the picture is the ovary. It is part of the carpel. The ovary contains and produces the female reproductive cells. The ovary also contains the ovule. The ovule stores and carries the female reproductive cells.

The little brown organism on the top-most stalk is an aphid. I found him exploring the flower and decided to take a closer look at him.

The pictures at the top and left are "Fred," our aphid. Fred and the other aphids are insects that suck the juices from plants. Aphids can cause damage to plants because they can transfer diseases into them. So far, this little aphid has not done much, but when there are hundreds of these little insects on one plant, then the plant will start to suffer.














       This is the anatomy of the broccoli flower, and now you will learn how flowering plants like these reproduce.
       A flowering plant is often referred to as an angiosperm. The life-cycle of angiosperms begins once flowers are produced. Every flower contains the anthers and the ovary (as seen in the above pictures), and inside the anthers is where each cell undergoes meiosis. The result of meiosis is four haploid cells. Each cell will become a pollen grain. The pollen grains' nucleus will undergo a mitotic division that will result in two haploid nuclei. Once the pollen grain stops growing, it is released from the anther and is put on a stigma.
       The ovule is where the female gametophyte develops. When a single diploid cell undergoes meiosis, it results in four haploid cells. After this occurs, three of those cells will disintegrate. That one remaining cell will go through mitosis to produce eight nuclei. The embryo sac is then produced, by using the eight nuclei and the surrounding membrane. The embryo sac is the female gametophyte of an angiosperm. One of the eight nuclei that is near the base of the gametophyte, is the egg nucleus. The egg nucleus is the female gamete, and when fertilization occurs, this cell will become the zygote that grows into a new beautiful plant.