BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
3rd Edition
ISBN: 9781260670929
Author: Hoefnagels
Publisher: MCG CUSTOM
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Chapter 22, Problem 14WIO
Summary Introduction
To determine:
The process by which plants grow towards light and the reason why this response is adaptive.
Introduction:
The tropism is defined as the orientation of a plant part towards or away from a stimulus such as light. The tropisms result in from differential growth, in which one side of the responding organ grows faster than the other.
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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.
1. How do plants protect themselves from foreign bodies?
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.
Chapter 22 Solutions
BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
Ch. 22.1 - What adaptations contribute to the reproductive...Ch. 22.1 - Prob. 2MCCh. 22.1 - Prob. 3MCCh. 22.2 - Label as many flower parts as possible in the...Ch. 22.2 - How does pollen move from one flower to another,...Ch. 22.2 - Prob. 3MCCh. 22.2 - Prob. 4MCCh. 22.2 - Prob. 5MCCh. 22.2 - Prob. 6MCCh. 22.2 - Prob. 7MC
Ch. 22.3 - Prob. 1MCCh. 22.3 - Prob. 2MCCh. 22.3 - Prob. 3MCCh. 22.4 - Prob. 1MCCh. 22.4 - Prob. 2MCCh. 22.4 - List the major classes of plant hormones, and name...Ch. 22.4 - Prob. 4MCCh. 22.5 - Prob. 1MCCh. 22.5 - How does light help regulate flowering time?Ch. 22.6 - Prob. 1MCCh. 22.6 - Prob. 2MCCh. 22 - The new gene combinations associated with sexual...Ch. 22 - Prob. 2MCQCh. 22 - Where would you find a male gametophyte? a. Inside...Ch. 22 - Prob. 4MCQCh. 22 - Prob. 5MCQCh. 22 - Prob. 6MCQCh. 22 - Prob. 7MCQCh. 22 - 8. What type of tropism is adaptive to a...Ch. 22 - Prob. 1WIOCh. 22 - Prob. 2WIOCh. 22 - Prob. 3WIOCh. 22 - Prob. 4WIOCh. 22 - Prob. 5WIOCh. 22 - Prob. 6WIOCh. 22 - Prob. 7WIOCh. 22 - Prob. 8WIOCh. 22 - Prob. 9WIOCh. 22 - Prob. 10WIOCh. 22 - Prob. 11WIOCh. 22 - What is the function of photoreceptors?Ch. 22 - Prob. 13WIOCh. 22 - Prob. 14WIOCh. 22 - Prob. 15WIOCh. 22 - Prob. 16WIOCh. 22 - Prob. 1SLCh. 22 - Prob. 1PITCh. 22 - Prob. 2PITCh. 22 - Prob. 3PITCh. 22 - Prob. 4PIT
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- 7. Name the gaseous plant hormone and describe three different actions of this hormone in plants. 8. Explain how the auxin:cytokinin ratio affects plant growth. 9. Which plant hormones are considered as growth inhibitorss? Why? 10. how does auxin promote phototropism?arrow_forwardWhat is a homeobox gene? Give at least two examples of plant tissues such genes might govern in a species such as A. thaliana.arrow_forwardExplain 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.arrow_forward
- Which of the following is not an example of pattern formation in developing plants? a. an epidermal cell receiving developmental signals from acortical cell b. the loosening of the cell wall to allow the elongation ofselected cells to reach mature size c. regulation by homeobox genes of the position of differentflower parts d. oriented cell division that establishes the shape of an organ e. cell expansion that directs specific cells to undergo mitosis ata given time and placearrow_forwardDiscuss Concepts Suppose a garden in your neighborhood is filled with red, white, and blue petunias. Explain the floral colors in terms of which wavelengths of light are absorbed and reflected by the petals.arrow_forwardThe nutritive tissue in the seeds of flowering plants that is formed from the union of a sperm cell and two polar nuclei is called the (a) plumule (b) endosperm (c) cotyledon (d) hypocotyl (e) radicalarrow_forward
- Phytochrome is a plant pigment protein that mediates plant infection promotes plant growth mediates morphological changes in response to red and far-red light inhibits plant growtharrow_forwardDescribe the roles played by stomata and guard cells. What would happen to a plant if these cells did not function correctly?arrow_forwardHow are plants classified on the basis of flowering frequency?arrow_forward
- 9. The colours of carotenoid pigments are different from those of chlorophylI. What do you think is the adaptive advantage of the presence of these pigments to photosynthetic plants?arrow_forward8.What is the difference between circadian rhythms and photoperiodism?arrow_forward3. 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)arrow_forward
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