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Given below are two statements
Statement (I) : In response to sudden, 5-10 °C rises in temperature, plants produce heat shock proteins.
Statement (II) : Heat shock proteins were discovered in the white fly and have since then been identified, in mamals,
humans, plants, fungi and microorganisms.
In light of the above statements, choose the most appropriate answer from the options given below.
EXPLANATION
Physiological Agronomy
- Statement (I) is correct: In response to sudden elevated temperature stress (typically a 5–10 °C jump above ambient growth conditions), plants rapidly synthesize and accumulate a conserved class of molecular chaperone proteins designated as Heat Shock Proteins (HSPs) to prevent denaturation and refold misfolded proteins.
- Statement (II) is incorrect: Heat shock proteins were originally discovered in the fruit fly Drosophila melanogaster by the Italian geneticist Ferruccio Ritossa in 1962 (observed as chromosomal puffing patterns following accidental temperature shifts in the laboratory incubator), not in the whitefly.
- Conclusion: Statement (I) is correct but Statement (II) is incorrect. (Correct answer: Option 3)
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