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Ch. 29 - Plant Diversity I: How Plants Colonized Land
All textbooksCampbell 12th EditionCh. 29 - Plant Diversity I: How Plants Colonized LandProblem 6
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Chapter 29, Problem 6

Identify each of the following structures as haploid or diploid. a. sporophyte b. spore c. gametophyte d. zygote

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Welcome back next. We'll be looking at the problem all the following are deployed structures and plants except and one of the kind of unique things about plants is that they have um This phenomenon called alteration of generations as we recall from content videos And so when we're doing plant biology, that's definitely something to study and understand. So to help us kind of spur our memory um I'm just going to put up this diagram of this alternation of generations to help keep straight which structures are deployed, in which our hap Lloyd and on it are indicated in white. The hap Lloyd indicated by n single set of chromosomes and in blue the deployed structures indicated by to end here. So we'll have this diagram here to spur our memory and remind ourselves definitely something to study before any test on plant biology. So let's look at our choices here. Choice A says spore a fight. Okay, well we see this for a fight right here on our diagram. It's a multi cellular structure and it is deployed. We see the two end there. So since that is deployed, we know that cannot be our answer. So we eliminate choice A choice B. Says spore mother cell. Well, the spores we see generated here are hap Lloyd and but they are generated by mitosis from the spore a fight. The spore mother cell is part of the sport fight and therefore is deployed. So the spore mother cell choice B also is eliminated as our correct answer choice C says Zygote. We look at our diagram or zygotes right here and as we recall, the zygote is generated when two gametes meet in fertilization and generate the deployed zygote. Zygote also deployed, so we eliminate choice C. Finally, we look at choice D. To fight. And when we check our diagram, we see that the tomato fight is right here. That's the multicellular app Lloyd structure in the alternation of generations. So called meta fight is our correct answer. It is the one answer that is not deployed. So D. Is our choice hope to see you in the next video.
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Textbook Question

In angiosperms, which of the following is correctly paired with its chromosome count? (A)microspore—n (B)zygote—n (C)egg—2n (D)megaspore—2n

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Textbook Question

Microphylls are found in which plant group? a. lycophytes b. liverworts c. ferns d. hornworts

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Textbook Question

Suppose an efficient conducting system evolved in a moss that could transport water and other materials as high as a tall tree. Which of the following statements about “trees” of such a species would be true?


a. Spore dispersal distances would probably decrease.

b. Females could produce only one archegonium.

c. Unless its body parts were strengthened, such a “tree” would probably flop over.

d. Individuals would probably compete less effectively for access to light.

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Textbook Question

EVOLUTION CONNECTION DRAW IT Draw a phylogenetic tree that represents our current understanding of evolutionary relationships between a moss, a gymnosperm, a lycophyte, and a fern. Use a charophyte alga as the outgroup. (See Figure 26.5 to review phylogenetic trees.) Label each branch point of the phylogeny with at least one derived character unique to the clade descended from the common ancestor represented by the branch point.

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