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Biology · BIOLOGICAL CLASSIFICATION
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Biology · BIOLOGICAL CLASSIFICATION
Diatoms are chief 'producers' in the oceans. What structural composition renders their cell wall indestructible, giving rise to 'diatomaceous earth'?
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Refer to the given figure showing fungal specimens labelled as (a), (b), and (c). Which option correctly identifies these organisms alongside their corresponding characteristic feature?
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Sleeping sickness is a serious human disease. What type of pathogen causes this disease and to which protozoan group does it belong?
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T.O. Diener (1971) discovered 'viroids' as the causative agent of potato spindle tuber disease. How do viroids structurally differ from conventional viruses?
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The accompanying figure depicts a dividing bacterium. What is the mode of reproduction shown, and what is its underlying genetic structural detail illustrated?
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Methanogens are specialized archaebacteria present in the digestive tract of ruminant animals like cows and buffaloes. What primary metabolic product is generated by these organisms from animal dung?
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Red tides in oceans are caused by rapid multiplication of certain photosynthetic protists. Which organism is responsible for this phenomenon and what harmful effect can it cause?
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Lichens are composite symbiotic associations consisting of an algal component (phycobiont) and a fungal component (mycobiont). Which statement accurately describes their physiological interdependence and ecological significance?
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Euglenoids lack a cell wall but possess a protein-rich flexible outer layer. What is this layer called, and how do euglenoids act nutritionally when deprived of sunlight?
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Why were acellular organisms like viruses, viroids, and prions not assigned a place in R.H. Whittaker's Five Kingdom Classification?
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Which combination of cellular and nutritional features uniquely defines Kingdom Animalia?
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Genera such as Alternaria, Colletotrichum, and Trichoderma belong to Deuteromycetes. What are their major ecological functions and structural characteristics?
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Match List-I with List-II regarding biological groups and key diagnostic features: List-I List-II A Methanogens I Protein-rich pellicle layer making body flexible B Cyanobacteria II Overlapping silica shells fitting like a soap box C Diatoms III Specialized heterocysts for fixing atmospheric nitrogen D Euglenoids IV Present in gut of ruminants for biogas production Choose the correct answer from the options given below:
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Match List-I with List-II: List-I (Scientist) List-II (Key Discovery / Concept) A Dmitri Ivanowsky I Demonstrated that fluid extract from infected tobacco plants could infect healthy plants (Contagium vivum fluidum) B M.W. Beijerinek II Discovered free infectious low-molecular-weight RNA causing potato spindle tuber disease lacking a protein coat C W.M. Stanley III Showed that viruses could be crystallised and consist largely of proteins D T.O. Diener IV Recognized that microbes causing mosaic disease of tobacco pass through bacteria-proof filters Choose the correct answer from the options given below:
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Neurospora is widely utilized as an indispensable experimental organism in biological sciences. What is its primary scientific application and taxonomic classification?
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Examine the diagram of Tobacco Mosaic Virus (TMV) provided in Figure 2.6(a). Which statement correctly details the identity and structural features of the labelled components?
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Which rule strictly governs the nucleic acid genome constitution of viruses?
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Kingdom Plantae includes eukaryotic chlorophyll-containing organisms. However, certain members exhibit partial heterotrophy. Which pair correctly identifies insectivorous plants and a parasitic plant respectively?
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Which unique feature distinguishes *Mycoplasma* from all other organisms in Kingdom Monera?
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In Ascomycetes and Basidiomycetes, fusion of haploid cells does not immediately result in diploid cells; instead, an intervening dikaryotic stage (\( n + n \)) occurs. What is the ultimate developmental fate of these dikaryotic hyphae in fruiting bodies?
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*Paramoecium* and *Amoeba* were earlier classified under the animal kingdom because they lack cell walls. Why were they reclassified into Kingdom Protista alongside *Chlamydomonas* and *Chlorella*?
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Under suitable conditions, slime moulds aggregate to form a structure that can grow and spread over several feet. What is this structure called, and what occurs under unfavorable conditions?
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