Biological Classification — Flashcards
Punjab Board · Class 11 · Biology
28 flashcards for Biological Classification (Punjab Board Class 11 Biology) to test yourself on key terms and facts.
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What was the main limitation of the Two Kingdom Classification system proposed by Linnaeus?
Answer
The Two Kingdom Classification (Plantae and Animalia) could not accommodate organisms that did not fit clearly into either category. It also failed to distinguish between eukaryotes and prokaryotes, u…
Kingdom Monera
Answer
Kingdom Monera consists solely of bacteria, which are prokaryotic organisms lacking a membrane-bound nucleus. Key characteristics include: cell walls made of polysaccharides and amino acids (not cellu…
What are archaeabacteria and what makes them unique?
Answer
Archaeabacteria are specialized bacteria that survive in extreme harsh habitats such as highly salty areas (halophiles), hot springs (thermoacidophiles), and marshy areas (methanogens). Their uniquene…
Compare cyanobacteria and chemosynthetic bacteria in terms of their mode of nutrition and ecological importance.
Answer
Cyanobacteria (blue-green algae) are photosynthetic autotrophs containing chlorophyll a like green plants. They are unicellular, colonial, or filamentous and can fix atmospheric nitrogen in specialize…
What is Kingdom Protista and why are its boundaries considered not well-defined?
Answer
Kingdom Protista includes all single-celled eukaryotes with a well-defined nucleus and membrane-bound organelles. Its boundaries are not well-defined because members like Chlamydomonas (a photosynthet…
Describe the ecological significance of diatoms (Chrysophytes) in marine ecosystems.
Answer
Diatoms are photosynthetic members of Chrysophytes found in fresh water and marine environments. They float passively as plankton and serve as the chief 'producers' in oceans, forming the base of aqua…
What causes 'red tides' and why are they dangerous to marine life?
Answer
Red tides are caused by rapid multiplication (population explosion) of red dinoflagellates (example: Gonyaulax), which are photosynthetic marine protists. When dinoflagellates bloom in large numbers, …
How do Euglenoids demonstrate both autotrophic and heterotrophic nutrition?
Answer
Euglenoids are mostly freshwater protists found in stagnant water that have a flexible body with a protein-rich layer called pellicle instead of a cell wall. They are photosynthetic autotrophs in the …
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