Which of the following set of cell organelles are involved in the biosynthesis of jasmonic acid through octadecanoidsignalling pathway? (1) Chloroplast and peroxisomes (2) Chloroplast and mitochondria (3) Mitochondria and […]
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![55 Jasmonic acids (JA) that are known to activate many defense responses in plants are biosynthesized in chloroplast and peroxisome. Which one of the following reactions is confined to perosoxisome only during biosynthesis of JA? (1) Conversion of 12, 13-epoxy linolenic acid to 12- oxo-phytodienoic acid by the action of allene oxide cyclase. (2) Conversion of 12-oxo-phytodienoic acid to 3-oxo2(2'[z]-pentenyl) cylopentane-l-octanoate by the action of oxo-phytodienoate reductase. (3) Conversion of linolenic acid to beeta-hydroperoxy linolenic acid by lipoxygenase. (4) Conversion of 13-hydroperoxy linolenic acid to 12, 13-Epoxy linolenic acid by allene oxide synthase](https://www.letstalkacademy.com/wp-content/uploads/2025/11/55-4.jpg)
CSIR NET Life Science Previous Year Questions and Solution Plant Hormones
Peroxisomal Role of Oxo-Phytodienoate Reductase in Plants
55 Jasmonic acids (JA) that are known to activate many defense responses in plants are biosynthesized in chloroplast and peroxisome. Which one of the following reactions is confined to perosoxisome […]
CSIR NET Life Science Previous Year Questions and Solution Plant Hormones
The Widely Used Plant-Derived Analgesic and Its Medicinal Importance
54. Which one of the following plant-derived molecules is widely used as an analgesic? (1) Abscisic acid (2) Salicylic acid (3) Jasmonic acid (4) Gibberellic acid Correct answer: (2) Salicylic […]
CSIR NET Life Science Previous Year Questions and Solution Plant Hormones
Comparative Roles of Plant Hormones
Which one of the following statements on plant hormones is INCORRECT? (1) Salicyclic acid is intimately involved in shoot and root elongation. (2) Ethylene is involved in senescence and fruit […]
CSIR NET Life Science Previous Year Questions and Solution Plant Hormones
Abscisic Acid’s Role in Postponing Programmed Cell Death in Cereal Aleurone Cells
Which or the following factors is known to be involved Postponing programmed cell death in cereal aleuroneuntil endosperm mobilization is complete? (1) Gibberellic acid (2) Abscisic acid (3) Acidic pH […]
CSIR NET Life Science Previous Year Questions and Solution Plant Hormones
Abscisic Acid (ABA) Inactivation
Which one of the following statements about phytohormone ABA is correct? (1) High level of ABA predominantly promotes vivipary. (2) ABA-Beeta-D-glucosyl ester is an active form of ABA. (3) Inactivation […]
CSIR NET Life Science Previous Year Questions and Solution Plant Hormones
Abscisic Acid Effects on Plant Development: Leaf Senescence, Gibberellin Inhibition, and Seed Dormancy Control
Following are certain facts about the effect of abscisic acid (ABA) on the development and physiological effect of plants: A. ABA promotes leaf senescence independent of ethylene B. ABA promotes […]
CSIR NET Life Science Previous Year Questions and Solution Plant Hormones
Abscisic Acid Promotes Desiccation Tolerance in Developing Seeds
49. A plant hormone that promotes the acquisition of desiccation tolerance in developing seed is (1) ABA (2) Ethylene (3) IAA (4) GA3. Correct answer: (1) ABA (Abscisic Acid) Explanation: […]
CSIR NET Life Science Previous Year Questions and Solution Plant Hormones
Abscisic Acid Degradation in Plants
Abscisic acid can be degraded by (1) Oxidation and reduction (2) Reduction and conjugation (3) Oxidation and conjugation (4) Light and reduction Correct answer: (3) Oxidation and conjugation Explanation: Abscisic […]
CSIR NET Life Science Previous Year Questions and Solution Plant Hormones
Key Processes in Seed Development
Which of the following DONOT occur during seed development? (1) Accumulation of storage proteins (2) Synthesis of LEA proteins (3) Desiccation (4) Synthesis of Gibberellic acid Correct answer: (4) Synthesis […]
