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Ch. 29 - Plant Diversity I: How Plants Colonized Land
Campbell - Campbell Biology 12th Edition
Urry12th EditionCampbell BiologyISBN: 9785794169850Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoUrry 12th EditionCh. 29 - Plant Diversity I: How Plants Colonized LandProblema 2
Capitolo 29, Problema 2

Which of the following characteristics of plants is absent in their closest relatives, the charophyte algae?
a. Chlorophyll b
b. Cellulose in cell walls
c. Sexual reproduction
d. Alternation of multicellular generations

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1
Identify the key characteristics of charophyte algae, which are the closest relatives to plants. Charophytes share many features with plants, but there are distinct differences.
Understand the concept of alternation of generations. This is a life cycle that includes both a multicellular diploid phase (sporophyte) and a multicellular haploid phase (gametophyte).
Recognize that charophyte algae do not exhibit alternation of multicellular generations. They primarily exist in a haploid state and do not have a multicellular diploid phase.
Compare the characteristics listed in the problem: chlorophyll b, cellulose in cell walls, sexual reproduction, and alternation of multicellular generations.
Determine which characteristic is unique to plants and absent in charophyte algae. The alternation of multicellular generations is a key feature of plants that is not present in charophyte algae.

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Alternation of Multicellular Generations

Alternation of multicellular generations is a life cycle characteristic in plants where they alternate between two distinct forms: the gametophyte and the sporophyte. The gametophyte is haploid and produces gametes, while the sporophyte is diploid and produces spores. This cycle is crucial for plant reproduction and is absent in charophyte algae, which do not exhibit this alternation.
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Laminaria Life Cycle: Alternation of Generations

Charophyte Algae

Charophyte algae are a group of green algae considered the closest relatives to land plants. They share several features with plants, such as chlorophyll b and cellulose in their cell walls. However, they lack certain plant-specific characteristics, such as the alternation of multicellular generations, which distinguishes land plants from charophytes.
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Cellulose in Cell Walls

Cellulose is a polysaccharide that forms the primary structural component of plant cell walls, providing rigidity and strength. Both plants and charophyte algae possess cellulose in their cell walls, which is a shared trait that supports their structural integrity. This characteristic is not unique to plants, as it is also found in charophyte algae.
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Pratica correlata
Domanda del libro di testo

Three of the following are evidence that charophytes are the closest algal relatives of plants. Select the exception.

a. Similar sperm structure

b. The presence of chloroplasts

c. Similarities in cell wall formation during cell division

d. Genetic similarities in chloroplasts

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Domanda del libro di testo

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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Domanda del libro di testo

Microphylls are found in which plant group?

a. Lycophytes

b. Liverworts

c. Ferns

d. Hornworts

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Domanda del libro di testo

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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