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Diatoms are photosynthetic plankton and are described as chief producers in oceans. Their silica-containing walls accumulate to form diatomaceous earth, which is used in polishing and the filtration of oils and syrups.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Protista - Chrysophytes and Dinoflagellates
“Lantana camara” for invasive species from tropical america. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Management outcomes depend on scale and context: suppressing abundance at one site does not guarantee regional eradication when dispersal reconnects treated and untreated populations. The remaining alternatives—“Eichhornia crassipes”, “Prosopis juliflora”, “Merops viridis”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Species mana
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 21
“High phenotypic plasticity” for success of invasive species depends on. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Effective control reduces propagule pressure or population growth without causing unacceptable non-target effects. Repeated monitoring is necessary because seed banks, dormant stages, recolonization, and density-dependent compensation can reverse short-term gains. The remaining alternatives—“Specialized needs”, “Low competitive ability”, “Limited dispersal”—refer to different st
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 21
Without prey or another usable food source, predator intake falls to zero while metabolic maintenance, mortality, and emigration continue. In the Lotka–Volterra equation dP/dt = baNP − mP, setting prey density N to zero gives dP/dt = −mP. Predator abundance then declines exponentially at rate m, assuming a closed population and no immigration. Stabilization would require replacement of deaths through feeding-supported reproduction or external subsidy, while increase is impossible under the model because prey conversion supplies the positive growth term. Oscillation also requires reciprocal fee
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 14
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