Plant Life Chapter 38

2699 Words Nov 20th, 2013 11 Pages
Chapter 38 Plant reproduction and Development

Sexual Reproduction
1. In general terms, explain how the basic plant life cycle with alternation of generations is modified in angiosperms.
The basic plant life cycle with alternation of generations is modified in angiosperms by the change of haploid (n) and diploid (2n) generations, which take turns making each other. 2. List four floral parts in order from outside to inside a flower.
 Sepals
 Petals
 Stamen
 Carpels
3. From a diagram of an idealized flower, correctly label the following structures and describe the function of each structure:  a. sepals- Sepals are in charge of protecting the flower’s bud before it blooms. It has the qualities of a leave and is usually in
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This has many advantages, such as the fact that double fertilization guarantees that the endosperm will develop only in ovules where the egg has been fertilized. It also avoids angiosperms from wasting nutrients. 13. Explain how fertilization in animals is similar to that in plants.
 Fertilization in animals is similar to that in plants because its first cellcell change occurs after gamete fusion rises in the cytoplasmic Ca2+ levels as it does in animal gamete fusion. Also, the plants make a block to polyspermy, which is the fertilization of an egg by more than one sperm cell, as do the animal’s cell’s eggs. 14. Describe the fate of the ovule and ovary after double fertilization. Note where major nutrients are stored as the embryo develops.
 After double fertilization, the ovule matures into a seed, and the ovary matures into a fruit encircling the seed. As the embryo grows the seed stores proteins, oils, and starch. 15. Describe the development and function of the endosperm. Distinguish between liquid endosperm and solid endosperm.
 After embryo development, endosperm is growth to store nutrients. This happens after double fertilization, when the triploid nucleus of the ovule’s central cell divides. This causes the formation of a milky multinucleate “supercell”. This becomes multicellular after cytokinesis. Finally, when the cell walls are completed, the endosperm becomes solid. 16. Describe the development of