. MAKE CONNECTIONS Does the life cycle of humanshave any structures analogous to plant gametophytes?Explain your answer. (See Figures 13.5 and 13.6.)
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. MAKE CONNECTIONS Does the life cycle of humans
have any structures analogous to plant gametophytes?
Explain your answer. (See Figures 13.5 and 13.6.)
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- Discuss Concepts Compare the size, anatomical complexity, and degree of independence of a Douglas fir female gametophyte and a dogwood female gametophyte. Which one is the most protected from the external environment? Which trend(s) in plant evolution does your work on this question bring to mind?In angiospermic plant before formation of microspore sporogenous tissue undergo cell division (a) Name the type of cell division. (b) What would be the ploidy of the cells of tetrad?Test Your Understanding Know and Comprehend 1. Seed plants lack which of the following structure(s)? (a) ovules surrounded by integuments (b) microspores and megaspores (c) vascular tissues (d) a large, nutritionally independent sporophyte (e) a large, nutritionally independent gametophyte
- . MAKE CONNECTIONS What type of feedback processis exemplified by the production of ethylene during fruitripening? Explain. (See Figure 1.10.)Lab 13 (a)- Vascular Plant Reproduction Can you recognize if a cone is male or female? If provided actual flowers or images of flowers, can you determine if they are from a monocot or dicot plant (based on the expected patterns of petals) Can you identify key parts of a flower (sepals, petals, stamen, pistil, anther, filament, stigma, style, ovary, ovules) Difference between perfect & imperfect flowers? If a plant produces flowers, is it a gymnosperm or angiosperm? What are the names and functions of the 2 cells within a pollen grain? During double fertilization, what 2 structures are fertilized? What does each fertilized structure become?Evolutionary biologists have coined the term exaptation to describe a common occurrence in the evolution of life. A plant organ originally has a particular function, however, fulfills a new one. Provide two examples of exaptation in plant organs and elaborate comprehensively.
- (a) Describe the role of mitosis in the growth of a plant. (b) Explain why there are more cells observed in mitosis in the root tip than in the woody stem.12. (a) Plant in FIGURE 12 can reproduce sexually or asexually. Sporophyte generation is dominant for this plant. A FIGURE 12 (i) Identify the name of the plant species in FIGURE 12 and its phylum. (ii) Name parts A and B. (iii) State the roles of part A and part B in reproduction.Know and Comprehend 8. The green, gametangia-bearing moss plant (a) is the haploid gametophyte generation (b) is the diploid sporophyte generation (c) is called a protonema (d) contains cells with single large chloroplasts (e) b and c
- Test Your Understanding Know and Comprehend 5. Motile sperm cells are found as vestiges in these two gymnosperm groups: (a) monocots, eudicots (b) gnetophytes, conifers (c) gnetophytes, flowering plants (d) cycads, conifers (e) cycads, ginkgoDiscuss Concepts Baobab trees (Adansonia spp.) store water in their trunks (stems) and, although the trees have leaves, considerable photosynthesis also occurs in the trunks. Cacti too have water-storing, photosynthetic stems. In terms of evolutionary adaptation, what does this information suggest about cacti and baobabs?You are studying a type of plant known as " rockcress" or Arabidopsis sp. You discover a mutant in which the central cell of the female gametophyte cannot be fertilized. What structure will not form in these mutant plants? Synergids Pollen tube Endosperm Egg cell