Gibberellins and Plant Growth — NEET Biology
✅ Asked in NEET 2024Spraying sugarcane crop with which of the following plant growth regulators increases the length of stem, thus increasing the yield? (NEET 2024)
Spraying sugarcane crop with which of the following plant growth regulators increases the length of stem, thus increasing the yield? (NEET 2024)
Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop. (NEET 2020)
Answer & NCERT explanation
Correct answer: B — Gibberellin
Gibberellin application increases sugarcane stem length and yield by promoting internode elongation. Gibberellins stimulate cell elongation in stems through enhanced cell wall loosening and increased cell division in intercalary meristems. This leads to taller plants with longer internodes, maximizing the harvestable portion. Auxin promotes apical dominance, cytokinins delay senescence, and ABA inhibits growth.
Read more NCERT concept on the PYQ
Sugarcane stores carbohydrate as sugar in their stems. Spraying sugarcane crop with gibberellins increases the length of the stem, thus increasing the yield by as much as 20 tonnes per acre.
NTA tests gibberellins' role in promoting stem elongation and increasing crop yield, specifically in sugarcane. Students often confuse gibberellins with other hormones or mistakenly think all plant hormones increase yield equally—this is wrong. Gibberellins specifically promote cell elongation in stems, not width, and increase yield by extending stem length where carbohydrates accumulate. Key point: gibberellins increase stem length → more storage space for sugars → higher yield (up to 20 tonnes/acre). Remember that gibberellins work through cell elongation, not cell division, and their application is a practical agricultural use tested frequently in NEET.
What does NCERT say about Sugarcane stores carbohydrate as?
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