HorthooZ – Kerala GK, PSC Questions & Onam Quiz

Q1 Multiple Choice Question

In commercial floriculture, Silver Thiosulfate (STS) solution is widely applied to cut carnations, orchids, and sweet peas to dramatically extend their vase life because silver ions (Ag+):

A Convert all sugars directly into liquid starch B Stimulate immediate cell division in petal margins C Act as potent, specific inhibitors of Ethylene action by binding to ethylene receptors D Destroy all bacteria inside the xylem without affecting the plant

Q2 Multiple Choice Question

In commercial viticulture, grape growers routinely spray Gibberellic Acid (GA3) onto bunches of 'Thompson Seedless' grapes in order to:

A Stop all cellular respiration to allow indefinite storage without refrigeration B Elongate the grape stalk (rachis) to prevent bunch rotting and increase berry size C Turn all purple grapes into bright green varieties D Inhibit the development of grape leaves entirely

Q3 Multiple Choice Question

Unlike most eukaryotic hormone signaling cascades, the membrane-bound receptors for Ethylene (such as ETR1 and ERS1 in the endoplasmic reticulum) function biologically as:

A Negative regulators that actively suppress ethylene responses in the absence of the gas by constitutively activating the downstream Serine/Threonine kinase CTR1 B Positive transcriptional activators that directly dimerize on nuclear promoters upon gas binding C Voltage-gated chloride channel pores that hyperpolarize vacuolar tonoplasts D Receptor tyrosine kinases that autophosphorylate downstream AKT survival cascades

Q4 Multiple Choice Question

The Green Revolution 'miracle wheat' varieties developed by Norman Borlaug contained semi-dwarfism genes (Rht-1) that rendered the plants insensitive to gibberellins due to mutations stabilizing which master growth-repressor proteins?

A DELLA proteins (nuclear transcriptional repressors bearing the N-terminal D-E-L-L-A motif) B EIN3 transcriptional activators C Aux/IAA repressors D ARR-B response regulators

Q5 Multiple Choice Question

During the historical discovery of Abscisic Acid by Addicott and colleagues in the 1960s, which quantitative biological test was used to isolate 'Abscisin II'?

A Cotton Seedling Explant Abscission Bioassay B Avena curvature test C Barley aleurone starch test D Pea internode test

Q6 Multiple Choice Question

Naturally occurring low-molecular-weight polycationic alkylamines in plants (such as Putrescine, Spermidine, and Spermine) that stabilize nucleic acids and cellular membranes during stress are called:

A Oligosaccharins B Systemins C Polyamines D Phytoalexins

Q7 Multiple Choice Question

Fruits such as Apple, Banana, Mango, and Tomato that show a sharp, dramatic surge in cellular respiration and ethylene production during the ripening process are biologically classified as:

A Non-climacteric fruits B Parthenocarpic fruits exclusively C Aggregate fruits D Climacteric fruits

Q8 Multiple Choice Question

In commercial pineapple plantations, which plant growth regulators are applied systematically across the fields to synchronize and induce uniform year-round flowering and fruit setting?

A Gibberellins and Cytokinins B Kinetin and Zeatin C Abscisic acid and CCC D Ethylene (or Ethephon) and Auxin (NAA)

Q9 Multiple Choice Question

The physiological bioassay for Cytokinins, which takes advantage of their ability to delay senescence and prevent the degradation of green pigments in detached leaves, is the:

A Chlorophyll Retention Bioassay (Richmond-Lang leaf disc test) B Avena curvature test C Barley aleurone test D Cotton petiole abscission test

Q10 Multiple Choice Question

Spraying which phytohormone onto sugarcane crops significantly elongates stem internodes, increasing cane yield by up to 20 tonnes per acre, while also being used to accelerate alpha-amylase production in barley malting?

A Ethylene B Cytokinins C Abscisic acid D Gibberellins (GA3 / Gibberellic acid)

Q11 Multiple Choice Question

Who first demonstrated the existence of a transmissible unilateral growth stimulus at the tip of Canary grass coleoptiles (Phalaris canariensis) in 1880, laying the historical foundation for the discovery of Auxin?

A F. Skoog B Charles Darwin and his son Francis Darwin C E. Kurosawa D Frits Went

Q12 Multiple Choice Question

The liquid endosperm of tender coconut ('Coconut Milk') has been extensively used in plant tissue culture since the 1940s by van Overbeek because it naturally contains rich concentrations of:

A Cytokinins (cell division factors) B Ethylene gas C Abscisic acid (growth inhibitor) D Colchicine

Q13 Multiple Choice Question

While Auxin from the shoot apex enforces apical dominance by suppressing lateral buds, direct application of which hormone directly onto dormant lateral buds overcomes this inhibition, stimulating bushy lateral branch growth?

A Cytokinin B Auxin itself C Abscisic acid D Ethylene

Q14 Multiple Choice Question

In commercial cucurbit vegetable cultivation (Cucumber, Pumpkin), application of Ethylene or Ethephon is economically valuable because it strongly promotes:

A Conversion of tendrils into subterranean storage tubers B Masculinization (increasing male flowers exclusively) C Feminization (dramatic increase in the proportion of female pistillate flowers) D Complete shedding of all floral buds

Q15 Multiple Choice Question

The physiological homeostasis and irreversible metabolic degradation of active Cytokinins in plant tissues is governed by which key catabolic enzyme?

A Indoleamine 2,3-dioxygenase B ACC Oxidase C Cytokinin Oxidase / Dehydrogenase (CKX) D Nitrate Reductase

Q16 Multiple Choice Question

In plant cells, the binding of Ethylene gas to its homodimeric endoplasmic reticulum receptor ETR1 strictly requires which transition metal ion cofactor coordinated within the transmembrane sensing domain?

A Divalent Iron (Fe2+) B Divalent Magnesium (Mg2+) C Divalent Zinc (Zn2+) D Monovalent Copper (Cu+ coordinated by RAN1 copper transporter)

Q17 Multiple Choice Question

When a plant leaf is chewed by herbivorous caterpillars or physically wounded, which lipid-derived phytohormone is rapidly synthesized via the octadecanoid pathway to trigger the production of protease inhibitors?

A Abscisic Acid B Indole-3-Acetic Acid C Jasmonic Acid (Jasmonates) D Gibberellic Acid

Q18 Multiple Choice Question

In Maize (Zea mays), viviparous mutants (vp mutants) produce abnormal seedlings that germinate prematurely directly on the ear cob while still attached to the parent plant because they are defective in:

A Ethylene gas oxidation B Biosynthesis or perception of Abscisic Acid (ABA) C Cytokinin degradation pathways D Synthesis of active Gibberellic acid

Q19 Multiple Choice Question

During Systemic Acquired Resistance (SAR), accumulation of Salicylic Acid (SA) alters the cytosolic redox environment, reducing intermolecular disulfide bridges to convert cytosolic inactive oligomers of which master regulator into active monomers that translocate into the nucleus?

A TIR1 ubiquitin ligase B ARR-B response regulator C NPR1 (Nonexpressor of Pathogenesis-Related Genes 1) D SLAC1 anion channel

Q20 Multiple Choice Question

During progressive soil drought, the pH of root-to-shoot xylem sap characteristically increases (alkalinizes from ~6.0 to ~7.0); how does this pH change trigger stomatal closure even before massive de novo ABA reaches the leaves?

A Alkaline apoplast dissociates ABA into unprotonated ABA- anions, trapping it from entering mesophyll cells and forcing it onto guard cell receptors B Alkaline pH destroys all stomatal pore proteins C Alkaline pH turns all water in xylem into ice D Alkaline pH instantly melts all guard cell wax

Plant Hormones (Phytohormones)

In commercial floriculture, Silver Thiosulfate (STS) solution is widely applied to cut carnations, orchids, and sweet peas to dramatically extend their vase life because silver ions (Ag+):

In commercial viticulture, grape growers routinely spray Gibberellic Acid (GA3) onto bunches of 'Thompson Seedless' grapes in order to:

Unlike most eukaryotic hormone signaling cascades, the membrane-bound receptors for Ethylene (such as ETR1 and ERS1 in the endoplasmic reticulum) function biologically as:

The Green Revolution 'miracle wheat' varieties developed by Norman Borlaug contained semi-dwarfism genes (Rht-1) that rendered the plants insensitive to gibberellins due to mutations stabilizing which master growth-repressor proteins?

During the historical discovery of Abscisic Acid by Addicott and colleagues in the 1960s, which quantitative biological test was used to isolate 'Abscisin II'?

Naturally occurring low-molecular-weight polycationic alkylamines in plants (such as Putrescine, Spermidine, and Spermine) that stabilize nucleic acids and cellular membranes during stress are called:

Fruits such as Apple, Banana, Mango, and Tomato that show a sharp, dramatic surge in cellular respiration and ethylene production during the ripening process are biologically classified as:

In commercial pineapple plantations, which plant growth regulators are applied systematically across the fields to synchronize and induce uniform year-round flowering and fruit setting?

The physiological bioassay for Cytokinins, which takes advantage of their ability to delay senescence and prevent the degradation of green pigments in detached leaves, is the:

Spraying which phytohormone onto sugarcane crops significantly elongates stem internodes, increasing cane yield by up to 20 tonnes per acre, while also being used to accelerate alpha-amylase production in barley malting?

Who first demonstrated the existence of a transmissible unilateral growth stimulus at the tip of Canary grass coleoptiles (Phalaris canariensis) in 1880, laying the historical foundation for the discovery of Auxin?

The liquid endosperm of tender coconut ('Coconut Milk') has been extensively used in plant tissue culture since the 1940s by van Overbeek because it naturally contains rich concentrations of:

While Auxin from the shoot apex enforces apical dominance by suppressing lateral buds, direct application of which hormone directly onto dormant lateral buds overcomes this inhibition, stimulating bushy lateral branch growth?

In commercial cucurbit vegetable cultivation (Cucumber, Pumpkin), application of Ethylene or Ethephon is economically valuable because it strongly promotes:

The physiological homeostasis and irreversible metabolic degradation of active Cytokinins in plant tissues is governed by which key catabolic enzyme?

In plant cells, the binding of Ethylene gas to its homodimeric endoplasmic reticulum receptor ETR1 strictly requires which transition metal ion cofactor coordinated within the transmembrane sensing domain?

When a plant leaf is chewed by herbivorous caterpillars or physically wounded, which lipid-derived phytohormone is rapidly synthesized via the octadecanoid pathway to trigger the production of protease inhibitors?

In Maize (Zea mays), viviparous mutants (vp mutants) produce abnormal seedlings that germinate prematurely directly on the ear cob while still attached to the parent plant because they are defective in:

During Systemic Acquired Resistance (SAR), accumulation of Salicylic Acid (SA) alters the cytosolic redox environment, reducing intermolecular disulfide bridges to convert cytosolic inactive oligomers of which master regulator into active monomers that translocate into the nucleus?

During progressive soil drought, the pH of root-to-shoot xylem sap characteristically increases (alkalinizes from ~6.0 to ~7.0); how does this pH change trigger stomatal closure even before massive de novo ABA reaches the leaves?

Practice Completed!

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Plant Hormones (Phytohormones)

In commercial floriculture, Silver Thiosulfate (STS) solution is widely applied to cut carnations, orchids, and sweet peas to dramatically extend their vase life because silver ions (Ag+):

In commercial viticulture, grape growers routinely spray Gibberellic Acid (GA3) onto bunches of 'Thompson Seedless' grapes in order to:

Unlike most eukaryotic hormone signaling cascades, the membrane-bound receptors for Ethylene (such as ETR1 and ERS1 in the endoplasmic reticulum) function biologically as:

The Green Revolution 'miracle wheat' varieties developed by Norman Borlaug contained semi-dwarfism genes (Rht-1) that rendered the plants insensitive to gibberellins due to mutations stabilizing which master growth-repressor proteins?

During the historical discovery of Abscisic Acid by Addicott and colleagues in the 1960s, which quantitative biological test was used to isolate 'Abscisin II'?

Naturally occurring low-molecular-weight polycationic alkylamines in plants (such as Putrescine, Spermidine, and Spermine) that stabilize nucleic acids and cellular membranes during stress are called:

Fruits such as Apple, Banana, Mango, and Tomato that show a sharp, dramatic surge in cellular respiration and ethylene production during the ripening process are biologically classified as:

In commercial pineapple plantations, which plant growth regulators are applied systematically across the fields to synchronize and induce uniform year-round flowering and fruit setting?

The physiological bioassay for Cytokinins, which takes advantage of their ability to delay senescence and prevent the degradation of green pigments in detached leaves, is the:

Spraying which phytohormone onto sugarcane crops significantly elongates stem internodes, increasing cane yield by up to 20 tonnes per acre, while also being used to accelerate alpha-amylase production in barley malting?

Who first demonstrated the existence of a transmissible unilateral growth stimulus at the tip of Canary grass coleoptiles (Phalaris canariensis) in 1880, laying the historical foundation for the discovery of Auxin?

The liquid endosperm of tender coconut ('Coconut Milk') has been extensively used in plant tissue culture since the 1940s by van Overbeek because it naturally contains rich concentrations of:

While Auxin from the shoot apex enforces apical dominance by suppressing lateral buds, direct application of which hormone directly onto dormant lateral buds overcomes this inhibition, stimulating bushy lateral branch growth?

In commercial cucurbit vegetable cultivation (Cucumber, Pumpkin), application of Ethylene or Ethephon is economically valuable because it strongly promotes:

The physiological homeostasis and irreversible metabolic degradation of active Cytokinins in plant tissues is governed by which key catabolic enzyme?

In plant cells, the binding of Ethylene gas to its homodimeric endoplasmic reticulum receptor ETR1 strictly requires which transition metal ion cofactor coordinated within the transmembrane sensing domain?

When a plant leaf is chewed by herbivorous caterpillars or physically wounded, which lipid-derived phytohormone is rapidly synthesized via the octadecanoid pathway to trigger the production of protease inhibitors?

In Maize (Zea mays), viviparous mutants (*vp* mutants) produce abnormal seedlings that germinate prematurely directly on the ear cob while still attached to the parent plant because they are defective in:

During Systemic Acquired Resistance (SAR), accumulation of Salicylic Acid (SA) alters the cytosolic redox environment, reducing intermolecular disulfide bridges to convert cytosolic inactive oligomers of which master regulator into active monomers that translocate into the nucleus?

During progressive soil drought, the pH of root-to-shoot xylem sap characteristically increases (alkalinizes from ~6.0 to ~7.0); how does this pH change trigger stomatal closure even before massive de novo ABA reaches the leaves?

Practice Completed!

Learn Better with the HorthooZ App

In Maize (Zea mays), viviparous mutants (vp mutants) produce abnormal seedlings that germinate prematurely directly on the ear cob while still attached to the parent plant because they are defective in: