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17. Label the archegonia with the egg cell in Figure 7 below. Figure 7. Mnium archegonial head l.s. Photo by Carolyn Alling 18. How do sperm cells get from the antheridial to archegonial heads? 19. Which is the most vulnerable stage of the moss life cycle? Why?

17. Label the archegonia with the egg cell in Figure 7 below. Figure 7. Mnium archegonial head l.s. Photo by Carolyn Alling 18. How do sperm cells get from the antheridial to archegonial heads? 19. Which is the most vulnerable stage of the moss life cycle? Why?

Biology 2e
Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter23: Protists
Section: Chapter Questions
Problem 2VCQ: Figure 23.25 Which of the following statements about Paramecium sexual reproduction is false? The...
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ve Obtain a Mnium mature sporophyte 1.s. prepared slide. Observe the capsule, or sporangium, of the sporophyte. The capsule is anchored to the gametophyte by a stalk, or seta, and a foot, both of which are also part of the sporophyte. The capsule is covered by a papery hood called a calyptra. Inside of the calyptra is an operculum, the capsule apex. The mouth of the capsule has a ring of toothlike structures called the peristome. During periods of high humidity, the peristome teeth bend inward and close the peristome. During dry periods, they bend out. This bending in and out aids in spore dispersal. (See text Figure 16-26, page 385.) 20. Label the spores on Figure 8 below. Where does n Figure 8. Moss capsule l.s. Photo by Carolyn Alling tophyte?
Transcribed Image Text:ve Obtain a Mnium mature sporophyte 1.s. prepared slide. Observe the capsule, or sporangium, of the sporophyte. The capsule is anchored to the gametophyte by a stalk, or seta, and a foot, both of which are also part of the sporophyte. The capsule is covered by a papery hood called a calyptra. Inside of the calyptra is an operculum, the capsule apex. The mouth of the capsule has a ring of toothlike structures called the peristome. During periods of high humidity, the peristome teeth bend inward and close the peristome. During dry periods, they bend out. This bending in and out aids in spore dispersal. (See text Figure 16-26, page 385.) 20. Label the spores on Figure 8 below. Where does n Figure 8. Moss capsule l.s. Photo by Carolyn Alling tophyte?
Now examine an archegonial head and find an archegonium. The moss archegonium has a very long stalk and neck, so it will be difficult to find an entire archegonium in any one section. Look for a long 2-4 cell wide, pink stained structure with a round egg cell amongst the paraphysis. 17. Label the archegonia with the egg cell in Figure 7 below. Figure 7. Mnium archegonial head l.s. Photo by Carolyn Alling 18. How do sperm cells get from the antheridial to archegonial heads? 19. Which is the most vulnerable stage of the moss life cycle? Why?
Transcribed Image Text:Now examine an archegonial head and find an archegonium. The moss archegonium has a very long stalk and neck, so it will be difficult to find an entire archegonium in any one section. Look for a long 2-4 cell wide, pink stained structure with a round egg cell amongst the paraphysis. 17. Label the archegonia with the egg cell in Figure 7 below. Figure 7. Mnium archegonial head l.s. Photo by Carolyn Alling 18. How do sperm cells get from the antheridial to archegonial heads? 19. Which is the most vulnerable stage of the moss life cycle? Why?
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