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Which of the following actions is responsible for the survival of species over time?
Conservation
Variation
Reproduction
Struggle
Variation
Variation is responsible for the survival of species over time. During reproduction, DNA copying introduces variations, which allow some individuals to adapt to changing environmental conditions and survive even when drastic changes occur.
Variation is responsible for the survival of species over time. During reproduction, DNA copying introduces variations, which allow some individuals to adapt to changing environmental conditions and survive even when drastic changes occur.
Think of different types of locks and keys. If you have a bunch of slightly different keys (variations), when the door lock changes due to new environmental conditions, at least one key is likely to open it and survive.
V for Variation = V for Vital for survival over time
VariationтЖТAdaptabilityтЖТEvolutionary┬аSurvival
During sexual reproduction, DNA replication undergoes minor errors or recombination, creating genetic variations among offspring. If an environmental hazard (like a sudden rise in water temperature) destroys most bacteria lacking heat resistance, the few variants with heat-resistant traits survive and reproduce, thus preserving the species.
Reproduction is essential for the continuity of a species.
DNA copying mechanisms are not 100% precise, leading to natural variations.
Variations make certain organisms resilient to drastic environmental fluctuations.
Without variation, a localized disease or climate change could wipe out an entire identical population.
Ensures biodiversity
Provides resilience against environmental disasters
Drives evolution of species
Some variations can be harmful or fatal to the individual
Natural selection studies
Agricultural breeding programs
Conservation biology
Option A (Conservation) relates to protecting existing wildlife.
Option B (Variation) is the fundamental biological mechanism for long-term survival and evolution.
Option C (Reproduction) ensures continuity of life, but without variation, populations are vulnerable to extinction.
B is correct тАФ Variation provides the necessary adaptability for species to survive over time amidst changing environmental conditions.
In RRB and competitive exams, always link 'survival over time' with 'variation' rather than just 'reproduction', because variations specifically protect against extinction during environmental disasters.
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