MARINE BIOLOGY
11th Edition
ISBN: 9781259880032
Author: CASTRO
Publisher: RENT MCG
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Chapter 6, Problem 3CT
Only very few flowering plants have invaded the oceans, but those that have are very successful. What are some possible reasons for the small number of marine flowering plants? How do those that have taken the step manage to thrive in some environments?
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A plant biologist discovers a new species of plant in the ashes of a recent forest fire along the sides of a steep mountain range. It is fall, and temperatures are dropping below freezing. The biologist cannot stay in the field to observe the plant. What can he infer about the plants reproductive strategy based on his recent observations?
A) the plant will produce flowers because at this altitude there is sufficient sunlight
B) the plant will produce comes because cones will mature into adult plants more rapidly
C) the plant will produce cones because cones allow for seed dispersal through all seasons
D) the plant will produce flowers because flowers can protect the seed from extreme conditions
Only very few flowering plants have invaded the oceans, but thosethat have are very successful. What are some possible reasons for thesmall number of marine flowering plants? How do those that havetaken the step manage to thrive in some environments?
Which of the following comparisons between the moss life cycle and fern life cycle are correct? A) Mosses have flagellated sperm that need water to reach the female gamete, while the sperm of ferns are unflagellated and are not dependent on water.B) The sporophyte generation is smaller than the gametophyte generation in mosses, but the sporophyte generation is much larger than the gametophyte generation in ferns.C) The spores are produced in capsules on stalks in mosses but in small structures called sori on the underside of leaves in ferns.D) The gametes are produced in gametangia in mosses but in specialized structures on the underside of leaves in ferns.E) Both kinds of plants depend on wind for dispersal of spores.
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- Glittering wood-moss (Hylocomium splendens) is a species of moss that can be found in Alaska and Canada. Based on what you know about mosses, what is likely true of the female gametes of glittering wood-moss? A) They are haploid.B) They lack flagella.C) They are produced when the gametophyte undergoes meiosis.D) They are smaller than the male gametes.E) They are housed in archegonia.arrow_forwardWhich of the following explains why pea plants in high soil nitrogen conditions have so few rhizobial nodules on their roots? When there is already high soil nitrogen there is a very large cost to having rhizobial nodules. The rhizobia bacteria in the nodules fix nitrogen when there isn't enough in the soil, so when there is already high soil nitrogen there is no advantage for the pea plant to expend the extra energy housing the rhizobia. The rhizobia bacteria in the nodules use nitrogen when there isn't enough in the soil, so in conditions of high soil nitrogen the plant tries to exclude the rhizobia to keep the nitrogen for itself. When there is already high soil nitrogen there is no benefit to the plant to having rhizobial nodules, which can rob the plant of the high nitrogen supplies so that the rhizobia bacteria do not have to fix the nitrogen themselves.arrow_forwardIn the early 1800s, potatoes became the main food staple for the people of Ireland. In 1845, a fungus native to South America, Phytophthora infestans, began to infect potato plants, causing potato blight and making the tubers inedible. Over the next several years, most of the potato plants in the country were destroyed by this invasive species. Which of the following statements correctly explains why the Irish potato famine occurred? The arrival of ships from South America led to human introduction of the disease. A drought across Ireland in 1844 led to more damaged potato plants that were susceptible to infection. An increase in trade with other European countries led to the introduction of plants that were already infected with the fungus. Ireland's climate became closer to that of South America, which allowed the fungus to infect potato plants and reproduce.arrow_forward
- In the early 1800s, potatoes became the main food staple for the people of Ireland. In 1845, a fungus native to South America, Phytophthora infestans, began to infect potato plants, causing potato blight and making the tubers inedible. Over the next several years, most of the potato plants in the country were destroyed by this invasive species. Which of the following statements correctly explains why the Irish potato famine occurred? A - The arrival of ships from South America led to human introduction of the disease. B - A drought across Ireland in 1844 led to more damaged potato plants that were susceptible to infection. C - An increase in trade with other European countries led to the introduction of plants that were already infected with the fungus. D - Ireland’s climate became closer to that of South America, which allowed the fungus to infect potato plants and reproduce.arrow_forwarda) What role does 'alternation of generation' play in encouraging survival of simple plants like the Bryophytes and Hepatophytes. b) i) Anthrophytes also show alternation of generation. Identify the structures that represent these two stages in its life cycle. ii) Explain why the alternation of generation in Anthrophytes must be different from that of the Bryophytes.(-arrow_forwardWhat are diatom blooms and why are they of particular interest to climate change scientists?arrow_forward
- Which of these is not a kind of plant? 1)abacus2)acanthus3)acacia4)asterarrow_forwardDefine the following terms related to alterations of generations: a.Gametophyte b.Sporophytearrow_forwardPlants and animals originated in water environments and, much later, plants invaded the land and later still, animals invaded the land. a) With respect to the four groups of plants (Bryophytes, seedless vascular plants, Gymnosperms, and Angiosperms), give the basic method of fertilization. That is, how do the sperm reach the eggs? b) What is the significance of the fertilization methods to the invasion of the land by the Gymnosperms and Angiosperms?arrow_forward
- In a bisexual flower if androcium and gynoecium mature at different time the phenomeon is known as _________ A) Dichogamy B) Herpogamy C) Haterogamy monogamy D) None of thesearrow_forwardWhich of the following is an example of a mutualism? Phoresy (seed transport) Mycorrhizal fungi and roots Mistletoe and oak trees Myrmecophytism (Ant-Plants) AND Mycorrhizal fungi and plant roots are examples of mutualisms. Myrmecophytism (Ant-Plants)arrow_forwardWhy are bryophytes considered as pollution indicators?arrow_forward
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Plant Reproduction in Angiosperms; Author: Amoeba Sisters;https://www.youtube.com/watch?v=HLYPm2idSTE;License: Standard YouTube License, CC-BY