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1. What is the relationship of cytokinin with the inhibition of leaf senescence?
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- 8.What is the difference between circadian rhythms and photoperiodism?2. Define the following terms: (a) papilla (b) abscission layer. How are each of thse structures involved in plant defense. 3. What changes occur in a plant cell undergoing the hypersensitive response?How are plants classified on the basis of flowering frequency?
- Explain the sequence of events in a flowering plant that begins with formation of a pollen tube and culminates with the formation of a diploid zygote and the 3n cell that will give rise to endosperm in a seed.What are the two alternating generations of plants?Describe the two-stage lifecycle of plants: the gametophyte stage and the sporophyte stage.
- 3. Read the following statements about plant growth substances Cytokinins promote cell division Abscisic acid closes stomata Giberellins promote leaf growth Auxin promotes cell elongation Ethene prevents fruit ripening iv) v)1. Consider the tradeoffs between having a living exterior with guard cells vs. a thick layer of waterproofed dead cells. How might this impact the ability of the plant to interact with the outer environment? 2. Why do some seeds undergo a period of dormancy, and how do they break dormancy? 3. Girdling is a process used to slowly kill a tree and/or to create a standing dead tree (a snag). Explain why girdling would kill a tree.8. The walls of epidermal cells on the aerial parts of the plant are covered with a waxy layer, called
- 10. Why are gibberellins important to the agricultural and brewing industries? 11. How do hormones regulate cell expansion and cell division? 12. What is the hormone response pathway that causes stomatal movement?1. What is the physiologic function of pigments in plants? 2. Give the pharmaceutical uses of green and yellow pigments.2. Plant cells communicate in a variety of ways to elicit cellular responses. In the figure below the plant is responding the presence of light with the release of auxin. Auxin was first discovered for its ability to promote growth in plants. It is a plant hormone that inhibits the lengthening and stimulate the formation of lateral roots and root hairs. (a) Describe the plant's response to the presence of light. (b) Explain the role that auxin has in eliciting the plant's response. (c) Explain how the behavioral responses of the plant affect their overall fitness.
