Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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- Please helparrow_forward10. Is the egg cell produced by meiosis or mitosis within an archegonium? Explain Obtain a prepared slide containing mature sporophytes and, using the low power lens of the microscope, find a complete sporophyte. 11. Is the sporophyte haploid or diploid?. Note that the sporophyte is attached to the gametophyte by a large foot. This structure grows through the base of the venter into the storage tissue of the archegonial head. 12. What is the function of the foot? 13. Is the sporophyte an "independent" or "dependent" organism? Explain The sporophyte also consists of a stalk, or seta, and a capsule, or sporangium (see text Figure 16-8, page 371). Numerous spores and elongated elaters are enclosed by the sterile jacket layer of the capsule. The elaters have spirally arranged, hygroscopic (moisture absorbing) wall thickenings that are sensitive to very slight changes in humidity. By twisting with changes in humidity, they aid in spore dispersal (see text Figure 16-12, page 375). Note the…arrow_forwarde th aci st SJ I the size, shape, and arrangement of the leaves, which are microphylls, small leaves with only one vein. Examine the roots and their relationship to the stem. In Selaginella, the roots grow downward from a leaf-bearing stem. The sporangia of the Lycopodiophyta are borne on leaves essentially similar to the sterile leaves of the plant. The sporangium bearing leaf is called a sporophyll. In Selaginella and Lycopodium, the sporophylls occur in compact aggregates called cones, or strobili. 1. Label the microphylls and strobili in the Figure 1 below. Figure 1. Lycopodium sp. Examine the prepared slide of a mature Lycopodium strobilus. (See text Figure 17-16, pages 406 and 407.) Note that Lycopodium, like most species in the Lycopodiaceae, is homosporous and only produces one type of spore. iw ow del ain 2. Label the spores in Figure 2 below. qXI 92 Laibaquari Figure 2. Lycopodium strobilus l.s. 3. Given that Lycopodium is homosporous, would you expect its gametophytes to be…arrow_forward
- What structures are pictured on the underside of this leaf in the image below? O spores O sori. seedsarrow_forwardwhich plant family often has a basal rosette of leaves and a well-developed hypanthium?arrow_forwardLeaves Dichotomous Key Using the provided dichotomous key, determine the latin name for each of the leaves below. Dichotomous Key for Leaves 1. Compound or simple leaf 1a) Compound leaf (leaf divided into leaflets) .go to step 2 1b) Simple leaf (leaf not divided into leaflets) go to step 4 2. Arrangement of leaflets 2a) Palmate arrangement of leaflets (leaflets all attached at one central point) ....Aesculus (buckeye) 2b) Pinnate arrangement of leaflets (leaflets attached at several points) ...go to step 3 3. Leaflet shape 3a) Leaflets taper to pointed tips .Carya (pecan) 3b) Oval leaflets with rounded tips IV Robinia (locust) 4. Arrangement of leaf veins 4a) Veins branch out from one central point ....go to step 5 4b) Veins branch off main vein in the middle .go to step 6 of the leaf. 5. Overall shape of leaf 5a) Leaf is heart-shaped..Cercis (redbud) 5b) Leaf is star-shaped VI VI ..Liquidambar (sweet gum) 6. Appearance of leaf edge 6a) Leaf has toothed (jagged) edge .Betula (birch)…arrow_forward
- Select all of the following that are true about the fern gametophyte. smaller than the sporophyte site of pollen production multicellular O produces gametesarrow_forwardByrophytes are usually found in areas that are very wet or damp at least part of the year. Which of the following statements describes characteristics of byrophytes that make them dependent on water? State all that numbers that apply. 1. They have a dominant gametophyte phase. 2. They have swimming sperm that need water so they can swim to fertilize the eggs of other nearby plants. 3. They do not have lignin-stiffened vascular tissue or roots to effectively distribute water throughout the plant.arrow_forwardGive answer.arrow_forward
- Give one significant difference between sporophte and gametophyte.arrow_forwardPart 1: Identify the haploid and diploid generations of the following plants. (Examples are found in your prelab reading) Identify the Bryophyte and if it is in its haploid or diploid reproductive state. A hornwort Haploid B Moss Haploid C Liverwort Haploid List the stages of the life cycles for all three classes of Bryophytes starting from the spore stage. 中 Mosses Liverworts Hornworts Spore Spore Spore How does the life cycle of nonvascular plants differ from that of vascular plants? Why are ferns considered vascular plants even though they share a life cycle similar to Bryophytes?arrow_forwardLabel the Heterosporous Vascular Plant life cycle: A: Microgametophyte B: Antheridium C: Archegonium D: Zygote E: F: G: H: J: K: Meiosis L: M:arrow_forward
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