Answer in step by step with explanation.Don't use Ai and chatgpt please. 1. Gymnosperms used to dominate the natural landscapes in the early (Triassic) and middle(Jurassic) Mesozoic era. However, today, in countries like Botswana they do not exist naturally.Based on their characteristics, explain at least 3 reasons why they have disappeared in thesearea and many other parts of the world.

The Decline of GymnospermsGymnosperms, once the dominant plant life form, have significantly…

Answered: 1. Gymnosperms used to dominate the…

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter29: Seed Plants

Section: Chapter Questions

Problem 4TYK

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Which of the following traits characterizes gym nosperms? The plants carry exposed seeds on modified leaves Reproductive structures are located in a flower After fertilization, the ovary thickens and forms a fruit The gametophyte is the longest phase of the life cycle.
1. Based on the readings you encountered in the course about gymnosperms, in general and cycads, in particular, explain the main morphological, anatomical and reproductive features that could have contributed to the continued survival of their lineages up to the present. 2. Explain the specific morphological, anatomical and reproductive features of cycads that make them more prone (relative to other gymnosperms) to extinction risks from man-made disturbances such as habitat-clearing and poaching. 3. Read the following article about the cycad. Does the Loneliest Plant in the World Need Help?https://www.nationalgeographic.com/science/article/does-the-loneliest-plant-in-the-world-need-help There are two genetics/technology -based interventions mentioned to help save the cycad species. Encephalartos woodii from extinction. What is your reaction to the author’s view about these approaches, do you agree or disagree? What other approaches can you propose to help solve the problem, given that…
1. Differentiate between:a. Homosporous and heterosporous plants b. Sporophyte and gametophyte plants c. Lycopodium and Selaginella 2. Why is Isoetes called quillwort?
III. Gymnosperms - have seeds and vascular tissue (Chapter 18) A. Zamia - live specimen and Figure 18-35 1. To what Phylum does this plant belong? 2. What is unique about where this plant grows? 3. One of the common names for cycads is sago palm. What is one of the major differences between the group that Zamia belongs to and true palms? 4. How is Zamia pollinated?
16. Label the following on Figure 5 below: Antheridia, Archegonia, Adult Sporophyte, Zygote, Egg, Sorus, Gametophyte, Sporangium, Fertilization. Meiosis Spore (n) 917 31 Spore (n) Mature dehiscing (2n) with spores (n) Immature sporangium (2n) Leaf Indusium (2n) Germinating spores (2ń) rhizoids Mature gametophyte prothallus (n) 1n 2n (2n) -Sperm (n) Leaf of a young sporophyte (2n) (n) prothallus (n) 96 (2n) Figure 5. Polystichum life cycle (drawn by Stephanie Preising, SCSU '20) Part B: Psilotum Examine the living Psilotum plant. Psilotum, is unique among living seedless vascular plants because it lacks both roots and true leaves. Note the dichotomous branching pattern of the stems. Instead of roots, Psilotum has an underground stem, a rhizome, which bears rhizoids for the absorption of water. Examine the Psilotum for the presence of sporangia, which are borne terminally on short side branches. Psilotum is homosporous, producing only one type of spore. The spores produce bisexual…
No need to explain why 1. Which of the following is not true of the gymnosperms? * A. Less dependent on water for fertilization B. Heterosporous C. Seed is not enclosed within an ovary D. Nonvascular plant 2. Which of the following phyla of the gymnosperm is the most advanced? * A. Ginkgophyta B. Gnetophyta C. Coniferophyta D. Cycadophyta 3. In which of the following features does angiosperm resemble a gymnosperm? * A. Mode of fertilization B. Presence of ovules C. Nature of endosperm D. Presence of vessel 4. How would you differentiate the phloem of a gymnosperm from an angiosperm? * A. having a no companion cells B. having no sieve tubes C. having no schlerenchyma D. having parenchyma 5. Which of the following does not function as support of angiosperms? * A. tracheids B. fiber C. lignin
A team of botanists discovers a new species of plant in a tropical rain forest. After observing its anatomy and life cycle, they note the following characteristics and observations: 1. Presence of pollen cones and ovulate cones 2. Diploid-dominant 3. Seeds 4. vascular tissues 5. Absence of anything that resembles a flower This plant is probably a(n) Group of answer choices moss angiosperm protist gymnosperm fern
Which of the following traits characterizes gymnosperms? a. The plants carry exposed seeds on modified leaves. b. Reproductive structures are located in a flower. c. After fertilization, the ovary thickens and forms a fruit. d. The gametophyte is longest phase of the life cycle.
Which feature(s) do ferns share with all other land plants? a. sporophyte and gametophyte life cycle stages b. gametophytes supported by a thallus c. dispersal of spores from a sorus d. asexual reproduction by way of gemmae e. water uptake by means of rhizoids.
1. Trace the evolutionary origin of Ptreidophytes
1. When bryophyte spores are dispersed to a favorable habitat, such as moist soil or tree bark, they may germinate and grow into gametophytes. (True or False) 2. Bryophytes lack vascular tissues and their bodies are composed of parenchyma cells. (True or False) 3. A bryophyte spore is a diploid cell that undergoes mitotic division to grow into a mature individual. (True or False) 4. A bryophyte spore is a diploid cell that undergoes mitotic division to grow into a mature individual. (true or false) 5. Elaters are non-sporogenous cells with spiral wall thickenings and is mainly for spore dispersal of liverworts. (True or False)
1. Which of the following created the great coal beds on this planet? * A. the compressed remains of cycads and gymnosperms B. the undecomposed bodies of gymnosperms and dinosaurs C. the remains of the seedless plants of the carboniferous forests D. the compression of great accumulations of peat formed from the anaerobic decomposition of mats of bryophyte 2. Why must bryophytes inhabit damp environment? It is because * A. their sporophyte generation is dependent on the gametophyte. B. their sperm must swim to reach the egg. C. they do not have woody tissues. D. females can produce only one archegonium. 3. Which of the following incorrectly pairs a sporophyte embryo with its food source? * A. Moss embryo-archegonium and gametophyte plant B. Fern embryo-female sporophyte surrounding archegonium C. Pine embryo-female gametophyte tissue in nucellus D. Corn embryo-3N endosperm tissue in seed 4. Which of the…

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