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Biology · BIOLOGICAL CLASSIFICATION
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Biology · BIOLOGICAL CLASSIFICATION
Historical classification systems placed *Chlamydomonas* and *Spirogyra* together under algae because both possessed a cell wall. In Whittaker's five-kingdom classification, where is unicellular *Chlamydomonas* placed relative to *Spirogyra*?
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Cyanobacteria (blue-green algae) are photosynthetic autotrophs. What chlorophyll pigment do they possess that is structurally similar to that found in green plants?
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Bacteria are categorized into four distinct morphological shapes based on their structure. Which option correctly matches these shapes with their respective plural names?
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According to the characteristics of the five kingdoms proposed by Whittaker, which kingdom completely lacks a nuclear membrane and shows noncellulosic cell wall composed of polysaccharides and amino acids?
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Regarding the site of meiotic reduction division and spore release in Basidiomycetes, which statement is factually precise?
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Match List-I with List-II: List-I (Fungal Class) List-II (Key Diagnostic Features) A Phycomycetes I Asexual spores are conidia produced exogenously; sexual spores are produced endogenously in sac-like asci B Ascomycetes II Sex organs absent; plasmogamy occurs by somatic cell fusion producing exogenous basidiospores C Basidiomycetes III Mycelium coenocytic and aseptate; asexual spores produced endogenously in sporangia D Deuteromycetes IV Only asexual or vegetative phases known; reproduce solely by conidia with septate mycelium Choose the correct answer from the options given below:
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In the plant life cycle, the phenomenon of 'alternation of generations' refers strictly to the alternation between which two physiological and nuclear phases?
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Refer to the structural representation of the bacteriophage in Figure 2.6(b). Which option correctly pairs the morphological region with its accurate biological role or molecular composition?
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Protozoans are classified into four major groups based on locomotory organelles. Which protozoan group moves and captures prey using pseudopodia, and which genus is a parasitic member of this group?
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In the three-domain classification system, how is Kingdom Monera treated in comparison to the eukaryotic kingdoms?
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Archaebacteria are capable of surviving under extreme harsh environmental habitats such as extreme salty areas (halophiles), hot springs (thermoacidophiles), and marshy areas (methanogens). What structural feature enables them to survive such extreme conditions?
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Earlier classification systems grouped diverse organisms like bacteria, blue-green algae, fungi, mosses, ferns, gymnosperms, and angiosperms under 'Plants'. What was the single unifying characteristic that led to this grouping?
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A biology researcher isolates an aquatic fungus growing on decaying organic matter. Microscopic analysis confirms that the mycelium is completely coenocytic and non-septate, producing endogenous zoospores inside sporangia. To which class does this organism belong?
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The sexual cycle in fungi involves three consecutive events. Which of the following precisely describes the initial step, 'plasmogamy'?
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White rust on mustard leaves is caused by a parasitic fungal organism. What is the genus name of this obligate parasite and its corresponding class?
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Match List-I with List-II regarding Characteristics of Five Kingdoms: List-I List-II A Monera I Noncellulosic (Polysaccharide + amino acid) cell wall B Protista II Cell wall present in some; Cellular body organisation C Fungi III Cell wall present with chitin; Multicellular/loose tissue D Plantae IV Cell wall present (cellulose); Tissue/organ body organisation Choose the correct answer from the options given below:
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Bacteria cause various diseases in humans, crops, farm animals, and pets. Which of the following sets of diseases is caused entirely by bacterial pathogens as specified in NCERT?
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Chemosynthetic autotrophic bacteria play a crucial role in nutrient recycling in ecosystems. What is the exact energy source they utilize for ATP production?
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The given diagram represents *Nostoc*, a filamentous cyanobacterium. What are the primary functions of the structures labeled as 'Heterocyst' and 'Mucilaginous sheath'?
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Heterotrophic bacteria are the most abundant in nature. Which of the following is NOT a beneficial welfare role performed by heterotrophic bacteria?
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Which combination of reproductive structures is uniquely characteristic of members belonging to the class Ascomycetes?
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How do Ascomycetes and Phycomycetes differ fundamentally regarding the origin and location of their asexual spore production?
Read answer →Biology · BIOLOGICAL CLASSIFICATION
