read pages 794-797 (asexual reproduction section)
Sexual Reproduction-
- genetic diversity
- adaptions
- only a fraction of seedlings survive
VS.
Asexual Reproduction-
- requires two main female and male parts (carpel+stamen)
- produces clones
- no need for pollenators
- diversity from mutation only
Mechanisms of Asexual Reproduction-
- fragmentation (separation of parent plant into parts that re-form whole plants)
- plants root system gives rise to other plants root systems
- vegetative reproduction (another name for asexual reproduction)
- very beneficial to a stable plant in a stable environment
Self Incompatibility of Asexual Reproduction (must use sexual reproduction)-
- rejection to a plants own pollen
- block growth of pollen tube from spores
- carpel taller than stamen, pollen cant fall into tube on carpel
Review for Test:
1. What is typically the result of double fertilization in angiosperms?
a. two embryos develop in every seed.
b. the endosperm develops into a diploid nutrient tissue.
c. both a diploid embryo and a triploid endosperm are formed
d. the fertilized antipodal cells develop into the seed coat.
e. a triploid zygote is formed.
2. At the conclusion of meiosis in plants the end products are always four haploid..
a. seeds
b. sperm
c. gametes
d. spores
e. eggs
3. All of the following are primary functions of the flower except..
a. egg production
b. sexual reproduction
c. pollen production
d. meiosis
e. photosynthesis
4. The ancestors of land plants were aquatic algae. Which of the following is not an evolutionary adaptation to life on land?
a. guard cells
b. c3 photosynthesis
c. root hairs
d. a waxy cuticle
e. xylem and phloem
5. What is the main force by which most of the water within the xylem vessels moves toward the top of a tree?
a. evaporation of water through stomata
b. active transport of ions in the stele
c. osmosis in the root
d. atmospheric pressure on roots
e. the force of root pressure
Answers: 1. c, 2. d, 3. e, 4. b, 5. a
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