CHAPTER 3 PLANT KINGDOM Questionnaire
CHAPTER 3 PLANT KINGDOM Questionnaire
Introduction to Plant Kingdom
Q: What are the primary characteristics of Kingdom Plantae?
- A: Kingdom Plantae includes eukaryotic, chlorophyll-containing organisms that are primarily autotrophic and use photosynthesis to obtain energy.
Q: What does alternation of generations mean in plants?
- A: Alternation of generations refers to the life cycle in plants where there is a regular alternation between two distinct forms: the haploid gametophyte and the diploid sporophyte
Classification Systems
Q: What is an artificial classification system?
- A: An artificial classification system is based on superficial morphological characteristics like habit, color, and leaf shape, rather than evolutionary relationships.
Q: Give an example of an artificial classification system.
- A: Linnaeus's classification system is an example of an artificial classification system.
Q: What is the natural classification system?
- A: The natural classification system considers natural affinities, including various internal features like anatomy, embryology, and phytochemistry.
Q: Who developed a well-known natural classification system for flowering plants?
- A: Bentham and Hooker developed a well-known natural classification system for flowering plants.
Q: What is a phylogenetic classification system?
- A: A phylogenetic classification system is based on evolutionary relationships, classifying plants based on common ancestry.
Q: What modern tools are used in phylogenetic classification?
- A: Modern classifications use tools like cytotaxonomy, chemotaxonomy, and numerical taxonomy.
Algae
Q: What are algae?
- A: Algae are simple, chlorophyll-bearing, thalloid, autotrophic organisms primarily found in aquatic environments.
Q: Where are algae typically found?
- A: Algae are found in freshwater and marine habitats, as well as in moist soils, on stones, and in association with fungi (lichens) and animals.
Q: How do algae reproduce vegetatively?
- A: Algae reproduce vegetatively by fragmentation.
Q: What are zoospores?
- A: Zoospores are flagellated, motile spores produced by algae during asexual reproduction.
Q: Describe isogamous reproduction in algae.
- A: Isogamous reproduction involves the fusion of gametes that are similar in size and shape.
Q: What is oogamous reproduction?
- A: Oogamous reproduction involves the fusion of a large, non-motile egg and a small, motile sperm.
Q: Name three classes of algae.
- A: Chlorophyceae (Green Algae), Phaeophyceae (Brown Algae), and Rhodophyceae (Red Algae).
Q: What pigments are found in Chlorophyceae?
- A: Chlorophyceae contain chlorophyll a and b.
Q: What type of food storage is found in Phaeophyceae?
- A: Phaeophyceae store food as laminarin and mannitol.
Q: Why are Rhodophyceae red in color?
- A: Rhodophyceae are red due to the presence of the pigment r-phycoerythrin.
Q: What are some economic uses of algae?
- A: Algae are used as food, in the production of hydrocolloids like agar, and for extracting substances like algin and carrageen.
Q: Name an example of green algae.
- A: Examples include Chlamydomonas, Volvox, Ulothrix, Spirogyra, and Chara.
Q: Give an example of brown algae.
- A: Examples include Ectocarpus, Dictyota, Laminaria, Sargassum, and Fucus.
Q: Mention an example of red algae.
- A: Examples include Polysiphonia, Porphyra, Gracilaria, and Gelidium.
Q: How do algae contribute to carbon dioxide fixation?
- A: Algae, being primary producers, fix carbon dioxide through the process of photosynthesis, contributing significantly to the carbon cycle.
Bryophytes
Q: Why are bryophytes called "amphibians of the plant kingdom"?
- A: Bryophytes are called "amphibians of the plant kingdom" because they require water to complete their life cycle, particularly for fertilization.
Q: What environments do bryophytes prefer?
- A: Bryophytes prefer moist, shady environments.
Q: What is the dominant phase in the bryophyte life cycle?
- A: The gametophyte is the dominant phase in the bryophyte life cycle.
Q: What structures do bryophytes lack?
- A: Bryophytes lack true roots, stems, and leaves but have structures that resemble them.
Q: How do bryophytes reproduce vegetatively?
- A: Bryophytes reproduce vegetatively through fragmentation.
Q: What are antheridia and archegonia?
- A: Antheridia are male sex organs that produce antherozoids, while archegonia are female sex organs that produce eggs.
Q: Describe the sporophyte in bryophytes.
- A: The sporophyte is diploid, dependent on the gametophyte for nutrition, and produces spores through meiosis.
Q: What role do bryophytes play in soil formation?
- A: Bryophytes contribute to soil formation by colonizing rocks and breaking them down over time.
Q: What are liverworts?
- A: Liverworts are a group of bryophytes, often thalloid, that grow in moist, shady environments.
Q: How do liverworts reproduce asexually?
- A: Liverworts reproduce asexually through gemmae produced in gemma cups.
Q: Give an example of a liverwort.
- A: Marchantia is an example of a liverwort.
Q: What is a protonema?
- A: A protonema is the first stage in the moss life cycle, developing directly from the spore.
Q: Name an example of moss.
- A: Examples include Funaria, Polytrichum, and Sphagnum.
Q: What is the economic importance of Sphagnum moss?
- A: Sphagnum moss is used as fuel (peat) and as a packing material in horticulture.
Q: How do bryophytes prevent soil erosion?
- A: Bryophytes prevent soil erosion by forming dense mats that hold the soil together.
Pteridophytes
Q: What are pteridophytes?
- A: Pteridophytes are the first group of plants to have a well-developed vascular system, including xylem and phloem.
Q: In what environments are pteridophytes commonly found?
- A: Pteridophytes are commonly found in cool, damp, shady places, and sometimes in sandy soils.
Q: What is the dominant phase in the pteridophyte life cycle?
- A: The sporophyte is the dominant phase in the pteridophyte life cycle.
Q: How are pteridophyte leaves classified?
- A: Pteridophyte leaves are classified as microphylls (small leaves) and macrophylls (large leaves).
Q: What is a prothallus?
- A: A prothallus is the small, multicellular, photosynthetic gametophyte of pteridophytes.
Q: What is the role of water in pteridophyte reproduction?
- A: Water is essential for the movement of antherozoids to the archegonium for fertilization.
Q: Name the four classes of pteridophytes.
- A: The four classes are Psilotopsida, Lycopsida, Sphenopsida, and Pteropsida.
Q: What is an example of Psilotopsida?
- A: Psilotum is an example of Psilotopsida.
Q: Give an example of Lycopsida.
- A: Examples include Selaginella and Lycopodium.
Q: What plant is an example of Sphenopsida?
- A: Equisetum (horsetail) is an example of Sphenopsida.
Q: Mention an example of Pteropsida.
- A: Examples include Dryopteris, Pteris, and Adiantum (true ferns).
Q: What is the significance of pteridophytes?
- A: Pteridophytes are used for medicinal purposes, as soil-binders, and as ornamental plants, and they are important in evolutionary studies.
Q: How do pteridophytes contribute to evolutionary studies?
- A: Pteridophytes represent a transitional stage from bryophytes to seed-bearing plants, providing insights into plant evolution.
Q: What are the primary differences between bryophytes and pteridophytes?
- A: Pteridophytes have a well-developed vascular system and a dominant sporophyte phase, while bryophytes lack a vascular system and have a dominant gametophyte phase.
Q: Why are pteridophytes considered more advanced than bryophytes?
- A: Pteridophytes are considered more advanced due to their vascular tissues and dominant sporophyte, which are absent in bryophytes.
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