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Latest OPSC AHO Exam Question (Objective Questions), MCQ in English

Subjects : Concerned Subject (Horticulture)

Question Bank OPSC Assistant Horticulture Officer Exam Paper 2 - English
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Concerned Subject (Horticulture)

Question 1Single Answer
Which agro-climatic classification of India was developed primarily for regional planning based on climate, soil, water resources and physiography?
  1. A
    Köppen climatic classification
  2. B
    Planning Commission agro-climatic regionalization
  3. C
    Thornthwaite moisture classification
  4. D
    USDA capability classification
Question 2Single Answer
Which feature most clearly distinguishes apomictic seed formation from ordinary sexual seed formation?
  1. A
    Endosperm is always absent
  2. B
    Embryo develops without fertilization
  3. C
    Seed coat develops from embryo
  4. D
    Meiosis always produces the embryo
Question 3Single Answer
In nucellar embryony, additional embryos generally originate from which tissue?
  1. A
    Nucellus surrounding the embryo sac
  2. B
    Integumentary epidermis
  3. C
    Endosperm
  4. D
    Funiculus
Question 4Single Answer
Polyembryony is particularly useful in citrus rootstock propagation because nucellar seedlings are generally?
  1. A
    Genetically similar to the maternal parent
  2. B
    Highly heterozygous and variable
  3. C
    Always dwarfing
  4. D
    Produced only after cross-pollination
Question 5Single Answer
Which phenomenon describes the development of more than one embryo within a single seed?
  1. A
    Apogamy
  2. B
    Polyembryony
  3. C
    Parthenocarpy
  4. D
    Vivipary
Question 6Single Answer
Adventitious roots on stem cuttings originate from positions other than the normal root system and commonly arise through activity near the?
  1. A
    Guard cells
  2. B
    Pollen mother cells
  3. C
    Vascular cambium and associated parenchyma
  4. D
    Cork cells exclusively
Question 7Single Answer
The principal horticultural advantage of clonal propagation is the ability to?
  1. A
    Generate maximum genetic recombination
  2. B
    Maintain desirable genotypes true-to-type
  3. C
    Eliminate every systemic pathogen automatically
  4. D
    Convert diploids into haploids
Question 8Single Answer
A major limitation of repeated vegetative propagation from infected mother plants is?
  1. A
    Perpetuation of systemic pathogens
  2. B
    Loss of all chromosomes
  3. C
    Compulsory seed dormancy
  4. D
    Increased meiotic recombination
Question 9Single Answer
Juvenility is particularly important in propagation because juvenile shoots generally show?
  1. A
    Greater rooting potential than mature shoots
  2. B
    Lower capacity for adventitious rooting
  3. C
    Complete inability to form callus
  4. D
    Immediate flowering after cutting
Question 10Single Answer
Top-working is primarily undertaken to?
  1. A
    Induce seed dormancy
  2. B
    Produce seedlings without fertilization
  3. C
    Replace the canopy cultivar while retaining an established root system
  4. D
    sterilize nursery soil
Question 11Single Answer
Successful vegetative propagation ultimately depends on cellular competence for?
  1. A
    Dedifferentiation and redifferentiation
  2. B
    Meiotic segregation alone
  3. C
    Chromosome elimination
  4. D
    Endosperm digestion
Question 12Single Answer
Which natural propagation structure consists of a horizontal above-ground stem that roots at nodes?
  1. A
    Corm
  2. B
    Tuberous root
  3. C
    Bulb
  4. D
    Runner
Question 13Single Answer
Strawberry is commercially multiplied primarily through?
  1. A
    Bulbils
  2. B
    Cormels
  3. C
    Runners
  4. D
    Root tubers
Question 14Single Answer
A stolon differs from a rhizome mainly because a stolon is generally?
  1. A
    Entirely composed of fleshy leaves
  2. B
    A swollen underground stem with tunics
  3. C
    An aerial or surface-running stem
  4. D
    A modified primary root
Question 15Single Answer
Suckers used for vegetative propagation usually develop from?
  1. A
    Basal or underground portions of the plant
  2. B
    Pollen grains
  3. C
    Seed coats
  4. D
    Floral nectaries
Question 16Single Answer
Pineapple is commonly propagated commercially using suckers, slips and?
  1. A
    Bulb scales
  2. B
    Cormels
  3. C
    Root tubers
  4. D
    Crowns
Question 17Single Answer
Which structure is fundamentally composed of a shortened stem surrounded by fleshy storage leaves?
  1. A
    Bulb
  2. B
    Rhizome
  3. C
    Corm
  4. D
    Stolon
Question 18Single Answer
A corm is best characterized as a?
  1. A
    Horizontal aerial branch
  2. B
    Fleshy underground root
  3. C
    Cluster of modified leaves without a stem
  4. D
    Solid swollen underground stem
Question 19Single Answer
Which feature distinguishes a true bulb from a corm?
  1. A
    Lack of a basal plate in the bulb
  2. B
    Absence of buds in the bulb
  3. C
    Root origin of the bulb
  4. D
    Presence of fleshy storage scales in the bulb
Question 20Single Answer
Potato tuber is morphologically a modified?
  1. A
    Cotyledon
  2. B
    Taproot
  3. C
    Hypocotyl only
  4. D
    Stem
Question 21Single Answer
The eyes of a potato tuber represent?
  1. A
    Axillary buds
  2. B
    Lenticels
  3. C
    Root initials
  4. D
    Hydathodes
Question 22Single Answer
Ginger is propagated through pieces of?
  1. A
    Bulbs
  2. B
    Corms
  3. C
    Runners
  4. D
    Rhizomes
Question 23Single Answer
A rhizome is distinguished by the presence of?
  1. A
    No buds
  2. B
    Root hairs throughout its surface
  3. C
    Nodes, internodes and scale leaves
  4. D
    Cotyledonary scars only
Question 24Single Answer
Which propagation medium is a heat-expanded mica mineral with high water-holding capacity?
  1. A
    Perlite
  2. B
    Gravel
  3. C
    Vermiculite
  4. D
    Rock phosphate
Question 25Single Answer
Perlite is especially valued in propagation media because it provides high?
  1. A
    Nutrient concentration
  2. B
    Cation-exchange capacity compared with clay
  3. C
    Aeration and drainage
  4. D
    Biological nitrogen fixation
Question 26Single Answer
Sphagnum moss is useful for air layering primarily because it combines high moisture retention with?
  1. A
    Good aeration
  2. B
    High salinity
  3. C
    Strong alkalinity
  4. D
    Very high bulk density
Question 27Single Answer
Coco peat is obtained principally from?
  1. A
    Coconut husk pith
  2. B
    Coconut endosperm
  3. C
    Coconut shell charcoal only
  4. D
    Coconut inflorescence
Question 28Single Answer
An important precaution when using poorly processed coco peat is to check for excessive?
  1. A
    Calcium carbonate crystals only
  2. B
    Silica deficiency
  3. C
    Oxygen evolution
  4. D
    Soluble salts
Question 29Single Answer
High bulk density in a propagation medium generally causes?
  1. A
    Increased macroporosity
  2. B
    Increased oxygen diffusion
  3. C
    Reduced pore space and aeration
  4. D
    Faster root respiration
Question 30Single Answer
Total porosity of a nursery substrate is principally related to the balance between?
  1. A
    Root and shoot dry weights
  2. B
    Chlorophyll and carotenoids
  3. C
    Nitrogen and phosphorus only
  4. D
    Air-filled and water-filled pore spaces
Question 31Single Answer
A propagation medium with excessive water retention is most likely to cause?
  1. A
    Greater stomatal opening at night
  2. B
    Increased root aeration
  3. C
    Reduced pathogen activity invariably
  4. D
    Root-zone oxygen deficiency
Question 32Single Answer
The primary purpose of intermittent mist over leafy cuttings is to?
  1. A
    Increase seed dormancy
  2. B
    Reduce transpirational water loss
  3. C
    Raise leaf temperature sharply
  4. D
    Prevent callus formation
Question 33Single Answer
Excessive continuous mist during rooting can be undesirable because it may cause?
  1. A
    Complete lignification of cuttings
  2. B
    Permanent elimination of fungi
  3. C
    Nutrient leaching and disease development
  4. D
    Immediate flower induction
Question 34Single Answer
Bottom heat in a propagation bench primarily promotes?
  1. A
    Root-zone metabolic activity
  2. B
    Pollen sterility
  3. C
    Seed coat thickening
  4. D
    Shoot dormancy
Question 35Single Answer
A hot bed differs from a cold frame because a hot bed possesses?
  1. A
    An artificial or biological heat source
  2. B
    No transparent cover
  3. C
    No growing medium
  4. D
    Permanent refrigeration
Question 36Single Answer
The traditional heat source in a hot bed can be?
  1. A
    Limewash
  2. B
    Dry quartz sand only
  3. C
    Fermenting organic manure
  4. D
    Activated charcoal
Question 37Single Answer
A cold frame primarily modifies the plant environment by?
  1. A
    Producing artificial rainfall continuously
  2. B
    Providing mechanical refrigeration
  3. C
    Maintaining complete darkness
  4. D
    Trapping solar heat and protecting plants
Question 38Single Answer
Shade-net houses are particularly useful for reducing?
  1. A
    Soil cation exchange
  2. B
    Incident solar radiation
  3. C
    Atmospheric oxygen
  4. D
    Seed viability
Question 39Single Answer
In a naturally ventilated poly-house, temperature regulation relies substantially on?
  1. A
    High-pressure steam
  2. B
    Complete sealing
  3. C
    Submergence irrigation
  4. D
    Vent openings and air exchange
Question 40Single Answer
Relative humidity is kept high during early rooting of leafy cuttings mainly to reduce the?
  1. A
    Number of chromosomes
  2. B
    Vapour-pressure gradient from leaf to air
  3. C
    Soil pH
  4. D
    auxin content to zero
Question 41Single Answer
Fog systems differ from conventional mist systems mainly in producing?
  1. A
    Larger soil aggregates
  2. B
    Heated nutrient pellets
  3. C
    Carbon dioxide bubbles
  4. D
    Finer water droplets
Question 42Single Answer
Which cutting consists of a piece of shoot bearing one or more nodes?
  1. A
    Leaf cutting
  2. B
    Root cutting
  3. C
    Stem cutting
  4. D
    Scale cutting
Question 43Single Answer
Hardwood cuttings are generally collected from?
  1. A
    Mature dormant shoots
  2. B
    Newly germinated cotyledons
  3. C
    Floral ovaries
  4. D
    Root caps
Question 44Single Answer
Semi-hardwood cuttings are usually obtained from?
  1. A
    Completely dormant old roots
  2. B
    Partially matured current-season shoots
  3. C
    Embryonic axes
  4. D
    Senescent leaves only
Question 45Single Answer
Softwood cuttings generally require greater humidity control because they?
  1. A
    Lose water rapidly through tender foliage
  2. B
    Have completely suberized surfaces
  3. C
    Lack living cells
  4. D
    contain no auxin
Question 46Single Answer
In a leaf-bud cutting, a successful new shoot develops from the?
  1. A
    Leaf lamina alone
  2. B
    Axillary bud
  3. C
    Root cap
  4. D
    Stipule scar
Question 47Single Answer
Root cuttings are most successful in species capable of forming?
  1. A
    Adventitious shoots from root tissue
  2. B
    Pollen tubes from roots
  3. C
    Seed coats from cortex
  4. D
    Flowers directly from root hairs
Question 48Single Answer
IBA is widely used in cutting propagation because it effectively promotes?
  1. A
    Seed coat formation
  2. B
    Pollen abortion
  3. C
    Leaf abscission exclusively
  4. D
    Adventitious root initiation
Question 49Single Answer
Compared with IAA, IBA is frequently preferred for rooting because IBA is generally?
  1. A
    A cytokinin
  2. B
    Completely insoluble in all solvents
  3. C
    More stable and effective in many species
  4. D
    An ethylene inhibitor only
Question 50Single Answer
Excessively high auxin concentration applied to cuttings may?
  1. A
    Convert roots into seeds
  2. B
    Guarantee unlimited rooting
  3. C
    Prevent every fungal infection
  4. D
    Inhibit rooting and injure tissues
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