21.Spermidine represents which of the following group of compounds. (1) jasmonic acid (2) polyamine (3) auxin (4) strigolactone Correct answer: (2) polyamine Explanation: Spermidine is a naturally occurring organic compound […]
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CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Mismatches in Plant-Derived Drugs and Their Botanical Sources
20. Which of the following is a mismatch between the plant drug and its source? (1) Codeine – Papaver Somniferum (2) Vinblastine – Catharanthus roseus (3) Quinine – Cinchona lefgeriana […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Amino Acid Precursors of Nicotine and Quinine: Insights into Alkaloid Biosynthesis
19. Which one of the following pairs of precursor amino acid and alkaloid is correct? (1) ‘Ornithine aspartate – nicotine’ and ‘tryptophan – quinine’. (2) ‘Ornithine – nicotine’ and ‘ […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Role of Dirigent Proteins in the Stereoselective Biosynthesis of Lignans in Plants
Dirigent proteins predominantly play an important role in biosynthesis of: (1) lignans (2) alkaloids (3) Terpenoids (4) amino acids Correct answer: (1) lignans Explanation: Dirigent proteins play a crucial role […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Biosynthesis of Phenylalanine via Shikimic Acid Pathway in Plants
17 Phenylalanine, a precursor of most of the phenolics in higher plants is a product of which one of the following pathways? (1) Shikimic acid pathway (2) Malonic acid pathway […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Phenylpropanoid Pathway as the Source of Plant Phenolic Secondary Metabolites
16. Which of the following is produced in phenyl propanoid pathway? (1) Phenolics (2) Carotenes (3) Alkaloids (4) Terpenes Correct answer: (1) Phenolics Explanation: The phenylpropanoid pathway leads to the production […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Phenylalanine as the Precursor of Plant Phenolic Secondary Metabolites
The precursor for most of phenolic secondary metabolites is (1) Phenyl alanine (2) Isopentyl pyrophosphate (3) Mevalonate (4) Geranyl phosphate Correct answer: (1) Phenyl alanine Explanation: Phenylalanine is the primary precursor […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Fungal Pathogen Detoxification Mechanisms Against Plant Cyanogenic Glycoside Defenses
Certain plant species produce cyanogenic glycosides to protect them from pathogens. A researcher has identified a variant of such a plant that has higher level of cyanogenic glycoside yet it […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Key Natural Terpenes: Artemisinin, Azadirachtin, Taxol, and Their Biological Roles
13. statements are made regarding natural product, terpenes. A. monoterpenes are five-carbon compounds. B. The anti-malarlal drug, artemisinin is a sesquiterpene. C. Azadirachtin is a triterpene derivative from the seed […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Biosynthesis Pathways of Terpenes, Phenolics, and Alkaloids in Plant Secondary Metabolism
12. Following are some statements for synthesis of secondary metabolites in plants. (A) Terpenes are synthesized by shikimic acid pathway and mevalonic acid pathway. (B) Alkaloids are nitrogen containing compounds […]
