Unit 8 Angiosperms Student Guided Notes

Transcription

1 Unit 8 Angiosperms Student Guided Notes Angiosperms General Characteristics of FloweringPlants All belong to the division Magnoliophyta and. Developing from the flower is. This extremely diverse division is responsible for countless industries. We are surrounded by them in everyday life, from further. This is based on their seed type and growth pattern. The food portion of the seed is called the cotyledon. As the name suggests, a. Other differences are outlined in the table below. Seed Monocot Dicot Seed leaf (first leaf to form in germination) Vascular Bundles (xylem and phloem) Veins in leaf Flower parts (such as petals and sepals)

2 Monocot/Dicot Visual Summary Monocots and Dicots also. have a tap root system. Monocot have a

3 Monocot or Dicot? The Flower The development of the flower and the fruit are the key to the success of the angiosperms. These specialized structures create a symbiotic relationship with certain animals to aid in fertilization as well as dispersion of the species.. After it is fertilized the flower will develop into a fruit which may be harvested and eaten by animals. to be dropped with a bit of extra fertilizer. Flowers. The. In most flowers this is fused together to form a. The. Eggs are stored in the ovary until they are fertilized. Special chemicals prevent sperm from fertilizing the eggs of flowers that are not the same kind. The

4 . The stamen. Sexual reproduction occurs when pollen from an anther is transferred to the stigma. Pollination is often aided by insects that have evolved with these plants. Plants can selffertilize or cross-fertilize (pollen transferred to stigma of a different plant). Try labeling the diagram to the left by memory. Types of Fruit The. The fleshy part of the fruit develops from the ovary and ovary wall of the flower. The function of this flesh varies in different plants but it to some. The fruit can take on a specialized shape to be transported by wind (e.g. maple) or water (e.g. coconut) or can develop into a fruit that offers an animal nutrition in exchange for transport. We commonly think of apples, bananas, oranges or melons as fruits, however, many other foods we don't consider are fruits as well. Foods such as because they develop from a flower.

5 Angiosperm Reproduction As with the gymnosperms,. Flowers hold male and female reproductive organs. The. It is here where meiosis takes place. In, meiosis produces the that and in _ meiosis produces that, around the embryo sac, and provides a passage for sperm to swim to the egg. Two sperm will enter the embryo sac.. This process is called. The fertilized polar nuclei will develop into a triploid (3n) endosperm that that develops from the zygote (fertilized egg). Still surrounding the seeds at this point is the fruit that has developed from the ovary wall. The fruit can function in various ways to aid in dispersal. Economic Importance of Angiosperms "To some black gold refers to oil. To others, it refers to coffee" - Mark Pendergast As with gymnosperms,. However,. Hardwoods are due to their varying colours and grain patterns. The durability and strength of hardwoods mean they are used for more expensive. Birch, maple, and oak are each examples of hardwoods that are commonly used for these purposes. When we think of angiosperms, we think of flowers and fruit, which both have obvious economic implications. Many angiosperms have a less woody or herbaceous tissue and

6 . For example, with sugar beets the root is used to make sugar and with sugar cane the stalk of the plant is used.. We do not only consume the fruit. One group of fruits has an extremely large effect on world nutrition. These are the grains. are consumed worldwide as a base of consumption providing starch to the diet. Other uses of angiosperms are seen in drinks such as. Cotton is used in. was derived from the rubber tree. Now most rubber is synthetic. that were derived from plants