Commercial bananas generally develop fruit without fertilization, a process called parthenocarpy.
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9Which nutrient is especially important for fruit development and quality in banana?
Banana
Easy
A.Sulfur
B.Iron
C.Calcium
D.Potassium
Correct Answer: Potassium
Explanation:
Banana requires a high supply of potassium for good bunch development and fruit quality.
Incorrect! Try again.
10What is the main purpose of covering a developing banana bunch?
Banana
Easy
A.To produce more suckers
B.To delay leaf emergence
C.To increase root growth
D.To protect the fruits
Correct Answer: To protect the fruits
Explanation:
Bunch covers protect developing bananas from insects, sun injury, dust, and physical damage.
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11What is the botanical name of papaya?
Papaya
Easy
A.Mangifera indica
B.Carica papaya
C.Citrus reticulata
D.Musa acuminata
Correct Answer: Carica papaya
Explanation:
Papaya is botanically known as Carica papaya.
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12Which method is most commonly used to propagate papaya?
Papaya
Easy
A.Grafts
B.Seeds
C.Cuttings
D.Layers
Correct Answer: Seeds
Explanation:
Papaya is commonly propagated by seeds raised in nurseries or containers.
Incorrect! Try again.
13Papain is obtained mainly from which part of the papaya plant?
Papaya
Easy
A.Latex of immature fruits
B.Pulp of ripe fruits
C.Seeds of mature fruits
D.Roots of young plants
Correct Answer: Latex of immature fruits
Explanation:
Papain is a protein-digesting enzyme collected from the latex of immature papaya fruits.
Incorrect! Try again.
14Which soil condition should be avoided when growing papaya?
Papaya
Easy
A.Prolonged waterlogging
B.Slightly acidic reaction
C.Good soil drainage
D.Moderate soil fertility
Correct Answer: Prolonged waterlogging
Explanation:
Papaya is highly sensitive to waterlogging, which can cause root and collar rot.
Incorrect! Try again.
15Male, female, and hermaphrodite are terms used to describe what in papaya?
Papaya
Easy
A.Root growth patterns
B.Fruit maturity stages
C.Seed dormancy types
D.Plant sex forms
Correct Answer: Plant sex forms
Explanation:
Papaya may occur as male, female, or hermaphrodite plants based on the flowers produced.
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16What is the botanical name of sweet orange?
Citrus
Easy
A.Citrus sinensis
B.Citrus medica
C.Citrus limon
D.Citrus maxima
Correct Answer: Citrus sinensis
Explanation:
Sweet orange is botanically known as Citrus sinensis.
Incorrect! Try again.
17Which propagation method is commonly used for commercial citrus plants?
Citrus
Easy
A.Crown planting
B.T-budding
C.Leaf cutting
D.Runner planting
Correct Answer: T-budding
Explanation:
T-budding is widely used to join a desired citrus variety with a suitable rootstock.
Incorrect! Try again.
18The fruit type found in citrus is called a:
Citrus
Easy
A.Achene
B.Hesperidium
C.Drupe
D.Pome
Correct Answer: Hesperidium
Explanation:
A citrus fruit is a modified berry known as a hesperidium.
Incorrect! Try again.
19Citrus fruits are well known as a dietary source of which vitamin?
Citrus
Easy
A.Vitamin C
B.Vitamin B12
C.Vitamin K
D.Vitamin D
Correct Answer: Vitamin C
Explanation:
Citrus fruits are rich in vitamin C, also called ascorbic acid.
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20Citrus canker is caused by which type of pathogen?
Citrus
Easy
A.Fungus
B.Bacterium
C.Nematode
D.Virus
Correct Answer: Bacterium
Explanation:
Citrus canker is a bacterial disease that causes raised lesions on leaves, twigs, and fruits.
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21A mango grower plans a high-density orchard at a spacing of m. Approximately how many trees can be planted in one hectare, excluding roads and buildings?
Mango
Medium
A.200 trees
B.500 trees
C.400 trees
D.300 trees
Correct Answer: 400 trees
Explanation:
Each tree occupies . Therefore, the planting density is trees per hectare.
Incorrect! Try again.
22The interior of a high-density mango canopy receives little sunlight and produces few fruits. Which practice is most appropriate immediately after harvest?
Mango
Medium
A.Retain all shoots until flowering
B.Apply additional nitrogen fertilizer
C.Prune crowded and upright shoots
D.Flood the orchard for several days
Correct Answer: Prune crowded and upright shoots
Explanation:
Postharvest pruning opens the canopy, improves light penetration and promotes productive shoot development for the next season.
Incorrect! Try again.
23A mature mango orchard shows strong alternate bearing despite receiving adequate nutrients. Which treatment is most suitable for promoting more regular flowering?
Mango
Medium
A.Remove leaves during fruit set
B.Apply paclobutrazol as recommended
C.Irrigate heavily before harvest
D.Spray urea during full bloom
Correct Answer: Apply paclobutrazol as recommended
Explanation:
Recommended soil application of paclobutrazol suppresses excessive vegetative growth and can promote flowering in alternate-bearing mango cultivars.
Incorrect! Try again.
24Young mango plants repeatedly develop collar rot after heavy rainfall in a poorly drained field. Which orchard modification would best address the underlying problem?
Mango
Medium
A.Maintain standing water around trunks
B.Plant more deeply in larger pits
C.Increase nitrogen application frequency
D.Plant on raised mounds with drainage
Correct Answer: Plant on raised mounds with drainage
Explanation:
Raised planting and effective drainage prevent water stagnation around the collar, reducing conditions favorable for root and collar diseases.
Incorrect! Try again.
25A mango orchard experiences severe fruit drop during the pea-to-marble stage following a prolonged dry period. What is the most appropriate immediate response?
Mango
Medium
A.Apply heavy nitrogen near the trunks
B.Prune all current-season shoots
C.Provide irrigation and conserve soil moisture
D.Stop irrigation until fruits mature
Correct Answer: Provide irrigation and conserve soil moisture
Explanation:
Moisture stress during early fruit development increases fruit drop. Timely irrigation and mulching help maintain fruit retention.
Incorrect! Try again.
26Banana is planted at a spacing of m. Approximately how many plants can be accommodated per hectare?
Banana
Medium
A.2,086 plants
B.3,586 plants
C.3,086 plants
D.2,586 plants
Correct Answer: 3,086 plants
Explanation:
Each plant occupies , so the density is approximately plants per hectare.
Incorrect! Try again.
27A farmer must choose between sword suckers and water suckers for establishing a banana field. Why are sword suckers generally preferred?
Banana
Medium
A.They have broad leaves and weak rhizomes
B.They remain permanently free from viruses
C.They produce bunches without field nutrition
D.They have vigorous buds and strong rhizomes
Correct Answer: They have vigorous buds and strong rhizomes
Explanation:
Sword suckers have narrow leaves, a well-developed rhizome and vigorous growth, making them better planting material than weak water suckers.
Incorrect! Try again.
28A tall banana cultivar has produced heavy bunches, and strong winds are expected. Which operation would most directly reduce lodging losses?
Banana
Medium
A.Removing all functional leaves
B.Flooding the field before the storm
C.Propping the bearing plants
D.Deep hoeing around the pseudostem
Correct Answer: Propping the bearing plants
Explanation:
Propping supports the pseudostem and heavy bunch, reducing plant breakage or uprooting under wind and fruit load.
Incorrect! Try again.
29Tissue-cultured banana plantlets are ready to leave the laboratory but have delicate leaves and roots. What should be done before field planting?
Banana
Medium
A.Store them under complete darkness
B.Harden them gradually in a nursery
C.Plant them immediately in flooded soil
D.Remove their roots before transplanting
Correct Answer: Harden them gradually in a nursery
Explanation:
Primary and secondary hardening allow tissue-cultured plantlets to adjust gradually to lower humidity, stronger light and field conditions.
Incorrect! Try again.
30Banana plants show progressive yellowing, wilting and brown discoloration of vascular tissue in the pseudostem. Which preventive strategy is most appropriate?
Banana
Medium
A.Use disease-free plants and resistant cultivars
B.Use infected suckers from high-yielding plants
C.Increase irrigation around affected plant mats
D.Retain diseased ratoons for the next crop
Correct Answer: Use disease-free plants and resistant cultivars
Explanation:
These symptoms indicate Fusarium wilt or Panama disease. Clean planting material, resistant cultivars and sanitation are central to management.
Incorrect! Try again.
31A dioecious papaya orchard has reached flowering, and the grower wants adequate pollination without retaining excessive non-fruiting plants. What should be done?
Papaya
Medium
A.Retain equal numbers of males and females
B.Retain only male plants along each row
C.Remove every male plant from the orchard
D.Retain about one male for ten females
Correct Answer: Retain about one male for ten females
Explanation:
In dioecious papaya, a limited number of male plants are required as pollen sources; approximately one male for ten female plants is commonly retained.
Incorrect! Try again.
32Papaya plants in a low-lying field decline rapidly after several days of standing water. Which corrective measure is most important for future plantings?
Papaya
Medium
A.Maintain continuous flooding around the roots
B.Provide raised beds and efficient drainage
C.Apply more nitrogen during water stagnation
D.Increase planting depth below the soil surface
Correct Answer: Provide raised beds and efficient drainage
Explanation:
Papaya is highly sensitive to waterlogging. Raised beds and drainage improve root aeration and reduce root and collar rot.
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33A grower wants to extract papain without destroying the developing papaya fruits. Which method is appropriate?
Papaya
Medium
A.Remove the roots during flowering
B.Cut deeply into the fruit cavity
C.Make shallow cuts on mature green fruits
D.Crush fully ripe fruits after harvest
Correct Answer: Make shallow cuts on mature green fruits
Explanation:
Papain is collected from latex released through shallow incisions on mature, green and still-unripe papaya fruits.
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34Papaya plants develop mosaic patterns, distorted leaves and ring-shaped markings on fruits. Which integrated response is most appropriate?
Papaya
Medium
A.Remove infected plants and manage aphid vectors
B.Use flood irrigation to wash off symptoms
C.Retain infected plants and apply extra nitrogen
D.Prune infected leaves and retain the plants
Correct Answer: Remove infected plants and manage aphid vectors
Explanation:
The symptoms indicate papaya ringspot virus. Infected plants should be removed promptly, while vector and weed-host management reduces further spread.
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35Papaya fruits must be transported to a distant market where they will be stored briefly before sale. At which stage should they preferably be harvested?
Papaya
Medium
A.When completely soft and fully yellow
B.Only after fruits fall naturally
C.At colour-break with initial yellowing
D.While very immature and dark green
Correct Answer: At colour-break with initial yellowing
Explanation:
Colour-break fruits are mature enough to ripen normally but firm enough to withstand handling and transportation better than fully ripe fruits.
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36A citrus tree shows bark cracking and gum exudation near the soil line in a poorly drained orchard. Which preventive practice is most appropriate?
Citrus
Medium
A.Maintain standing water around the tree basin
B.Cover the bud union with moist field soil
C.Apply nitrogen directly against the trunk
D.Keep the bud union above soil and improve drainage
Correct Answer: Keep the bud union above soil and improve drainage
Explanation:
These symptoms are associated with Phytophthora gummosis. A raised bud union and good drainage reduce infection at the trunk base.
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37A citrus nursery is being established in a region where tristeza virus is common. Which combination gives the best foundation for disease management?
Citrus
Medium
A.Unknown budwood and a susceptible rootstock
B.Field seedlings and unrestricted aphid populations
C.Infected scions and deeply buried bud unions
D.Certified budwood and a tolerant rootstock
Correct Answer: Certified budwood and a tolerant rootstock
Explanation:
Virus-tested budwood reduces the chance of introducing tristeza, while a tolerant rootstock limits severe decline caused by susceptible combinations.
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38Citrus trees show blotchy leaf mottling, small lopsided fruits and uneven fruit coloration. What is the most suitable management approach?
Citrus
Medium
A.Apply additional phosphorus to cure the trees
B.Flood the orchard to suppress the pathogen
C.Remove infected trees and control psyllids
D.Prune symptoms and retain infected trees
Correct Answer: Remove infected trees and control psyllids
Explanation:
These are characteristic symptoms of citrus greening. There is no reliable cure, so infected trees are removed and psyllid vectors are managed.
Incorrect! Try again.
39A citrus orchard has dense internal growth, poor spray penetration and low fruit colour. Which canopy operation is most appropriate?
Citrus
Medium
A.Head back every scaffold branch each month
B.Allow rootstock suckers to fill the canopy
C.Remove all leaves before the flowering season
D.Remove dead, crossing and inward-growing branches
Correct Answer: Remove dead, crossing and inward-growing branches
Explanation:
Selective pruning improves light distribution and spray coverage while retaining enough healthy foliage for flowering and fruit development.
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40A citrus grower wants to regulate flowering into a selected bahar. Which orchard condition is generally created before restoring irrigation and nutrition?
Citrus
Medium
A.A continuous supply of high nitrogen
B.A controlled period of moisture stress
C.A prolonged period of complete flooding
D.A continuous period of heavy irrigation
Correct Answer: A controlled period of moisture stress
Explanation:
Temporary moisture stress induces rest in citrus trees. Restoring irrigation and nutrition afterward promotes a synchronized flowering flush in the desired bahar.
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41A mature mango orchard shows vigorous vegetative growth, dense dark-green canopies, and almost no flowering after repeated nitrogen applications. Which intervention most directly addresses the likely physiological cause of poor flowering?
Mango
Hard
A.Irrigate frequently during floral induction
B.Apply additional nitrogen before winter
C.Reduce late nitrogen and regulate canopy vigor
D.Remove all terminal shoots after harvest
Correct Answer: Reduce late nitrogen and regulate canopy vigor
Explanation:
Excess late nitrogen promotes vegetative growth at the expense of reproductive development. Controlling vigor and avoiding late nitrogen improves the balance between vegetative and floral growth.
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42In a high-density mango orchard, lower branches become shaded and fruit size declines despite adequate irrigation and nutrition. Which management strategy is most appropriate for restoring productive light distribution?
Mango
Hard
A.Use systematic canopy opening and renewal pruning
B.Apply more nitrogen to shaded branches
C.Allow the canopy to expand until branches overlap
D.Increase irrigation during fruit enlargement
Correct Answer: Use systematic canopy opening and renewal pruning
Explanation:
Canopy crowding reduces light interception by productive leaves and limits fruit development. Selective opening and renewal pruning improve light penetration and maintain a manageable fruiting framework.
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43A mango cultivar produces abundant flowers, but fruit set remains poor during a period of cool, cloudy weather. Which explanation best integrates the likely reproductive constraints?
Mango
Hard
A.Mango flowers normally set fruit without pollination
B.Cool weather may reduce pollinator activity and pollen function
C.Cloudy weather always increases viable pollen production
D.Fruit set is controlled entirely by nitrogen availability
Correct Answer: Cool weather may reduce pollinator activity and pollen function
Explanation:
Mango fruit set depends on effective pollen transfer and viable pollen. Cool, cloudy conditions can reduce insect activity and impair pollen performance, causing low set even when flowering is abundant.
Incorrect! Try again.
44A grower wants to reduce alternate bearing in a mango cultivar with a strong tendency to produce a heavy crop one year and a light crop the next. Which integrated approach is most defensible?
Mango
Hard
A.Avoid irrigation during all fruit development stages
B.Apply heavy nitrogen immediately after flowering
C.Use crop regulation, balanced nutrition, and timely pruning
D.Retain every flower in the heavy year
Correct Answer: Use crop regulation, balanced nutrition, and timely pruning
Explanation:
Alternate bearing is influenced by crop load, carbohydrate use, hormonal effects, and shoot age. Regulating excessive crops and maintaining balanced nutrition and canopy renewal can moderate year-to-year fluctuations.
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45Mango fruits develop internal flesh browning and uneven ripening even though external skin color appears acceptable at harvest. Which production decision would best reduce the risk of this quality problem?
Mango
Hard
A.Delay harvest until all fruits develop identical skin color
B.Harvest at the cultivar-specific physiological maturity
C.Increase nitrogen immediately before harvest
D.Harvest only after fruit becomes fully soft on the tree
Correct Answer: Harvest at the cultivar-specific physiological maturity
Explanation:
Internal disorders and poor ripening are often associated with immature or poorly timed harvest. Physiological maturity, rather than complete softening or uniform skin color, is the appropriate harvest criterion.
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46A banana plantation has vigorous pseudostems but produces small bunches and weak ratoon crops. Soil testing shows adequate macronutrients, while the field remains poorly drained after irrigation. Which diagnosis is most plausible?
Banana
Hard
A.Excess sunlight has prevented pseudostem formation
B.Early bunch covering has eliminated all fruit growth
C.Waterlogging has impaired roots and nutrient uptake
D.High drainage has caused persistent root anoxia
Correct Answer: Waterlogging has impaired roots and nutrient uptake
Explanation:
Banana is highly sensitive to poor drainage. Waterlogging reduces root respiration, damages feeder roots, and lowers nutrient and water uptake, leading to weak bunches and poor ratooning despite adequate soil nutrient levels.
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47In a commercial banana block, bunches are exposed to rubbing leaves, bird damage, and uneven surface blemishes. Which intervention most directly improves both protection and marketable fruit quality?
Banana
Hard
A.Cover bunches with suitable perforated protective sleeves
B.Increase nitrogen after the bunch has matured
C.Leave the bunches uncovered until individual fingers soften
D.Remove all leaves immediately after flowering
Correct Answer: Cover bunches with suitable perforated protective sleeves
Explanation:
Bunch covering reduces abrasion, pest injury, sun damage, and surface blemishes. Perforation is important because it permits ventilation and reduces excessive heat and humidity around the fruit.
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48A farmer retains five suckers around each mother plant to ensure a continuous harvest, but the plantation develops uneven bunch emergence and declining bunch weight. What is the most likely cause?
Banana
Hard
A.The mother plant has received too much pollination
B.Excessive sucker retention has created strong competition
C.Bunch emergence is independent of plant population
D.Removing all suckers would permanently stop ratooning
Correct Answer: Excessive sucker retention has created strong competition
Explanation:
Too many suckers compete for water, nutrients, and light. Maintaining a properly selected follower sucker or a planned ratoon structure is necessary for uniform growth and acceptable bunch weight.
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49A banana grower removes the male bud soon after the last hand opens. Under which condition is this practice most likely to be agronomically justified?
Banana
Hard
A.When it is performed before the first hand emerges
B.When it reduces thrips habitat and directs assimilates to the bunch
C.When it replaces the need for adequate potassium fertilization
D.When it guarantees pollination of all edible fingers
Correct Answer: When it reduces thrips habitat and directs assimilates to the bunch
Explanation:
Removing the male bud after the final hand has opened can reduce pest shelter and may improve assimilate allocation. Removing it earlier risks damaging bunch development or reducing fruit number.
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50A plantation experiences severe leaf-area loss from Sigatoka before bunch filling. Which management principle is most important for protecting yield?
Banana
Hard
A.Maintain functional leaves during bunch development
B.Stop irrigation once disease symptoms appear
C.Remove all healthy leaves at flowering
D.Increase plant density to compensate for defoliation
Correct Answer: Maintain functional leaves during bunch development
Explanation:
Banana depends heavily on active leaves for assimilate production during bunch filling. Integrated disease management should preserve green leaf area while avoiding unnecessary removal of healthy leaves.
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51A papaya field planted from seed develops many nonproductive male plants, reducing effective plant density. Which production decision most directly prevents this problem in a commercial orchard?
Papaya
Hard
A.Prune male plants after every irrigation
B.Increase nitrogen to convert male plants into females
C.Use sex-identified planting material where available
D.Plant at wider spacing to change genetic sex
Correct Answer: Use sex-identified planting material where available
Explanation:
Sex expression in papaya is genetically determined and cannot be reliably changed by nitrogen, spacing, or pruning. Sex-identified or known-sex planting material reduces the need for later rogueing.
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52Papaya plants in a low-lying field show yellowing, root decay, and sudden wilting after repeated rainfall. Which corrective measure is most appropriate?
Papaya
Hard
A.Prune the crown to reduce all transpiration
B.Increase irrigation to dilute the wet soil
C.Apply heavy nitrogen to restore root activity
D.Improve drainage and avoid prolonged saturation
Correct Answer: Improve drainage and avoid prolonged saturation
Explanation:
Papaya has a shallow, sensitive root system and performs poorly under waterlogging. Drainage improvement is the primary corrective measure because prolonged saturation promotes root decay and wilt.
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53A mature mango orchard shows severe alternate bearing: trees carrying a heavy crop this year produce little vegetative growth and almost no crop the following year. Which intervention most directly addresses the physiological basis of this problem?
Mango
Hard
A.Apply additional nitrogen during full bloom in the heavy-crop year
B.Delay harvesting until all fruits attain tree-ripe eating quality
C.Prune all terminal shoots immediately before expected panicle emergence
D.Thin the current crop and maintain postharvest nutrition and irrigation
Correct Answer: Thin the current crop and maintain postharvest nutrition and irrigation
Explanation:
A heavy crop depletes carbohydrates and suppresses the postharvest shoot growth needed for the next season's flowering. Crop-load regulation combined with postharvest resource replenishment helps restore annual bearing.
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54A grower raises rootstocks from seeds of a polyembryonic mango cultivar. Most seedlings are uniform, but a few differ markedly in vigor and leaf morphology. What is the most likely explanation?
Mango
Hard
A.The variable seedlings developed without fertilization
B.The uniform seedlings arose from selfed embryos
C.The uniform seedlings resulted from graft incompatibility
D.The variable seedlings arose from zygotic embryos
Correct Answer: The variable seedlings arose from zygotic embryos
Explanation:
Polyembryonic seeds usually contain several maternal nucellar embryos and one genetically variable zygotic embryo. Nucellar seedlings tend to be uniform and true to the maternal genotype.
Incorrect! Try again.
55Paclobutrazol applied as a soil drench can promote flowering in vigorous mango trees principally because it:
Mango
Hard
A.Inhibits gibberellin biosynthesis and restricts vegetative growth
B.Releases ethylene directly and induces simultaneous fruit ripening
C.Stimulates auxin synthesis and increases terminal shoot elongation
D.Supplies a persistent cytokinin source that converts every vegetative bud into a flower bud
Correct Answer: Inhibits gibberellin biosynthesis and restricts vegetative growth
Explanation:
Paclobutrazol inhibits gibberellin biosynthesis, reducing shoot extension and favoring conditions associated with floral induction. Dose and timing must be adjusted for tree size, soil, and cultivar.
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56In an 'Alphonso' mango block with a history of spongy tissue, which harvest decision is most appropriate for reducing the disorder while preserving marketability?
Mango
Hard
A.Harvest immature fruits and induce ripening with excessive ethylene
B.Delay harvest and expose fruits to direct afternoon sunlight
C.Retain fruits until they soften fully on the tree
D.Harvest at physiological maturity before advanced tree ripening
Correct Answer: Harvest at physiological maturity before advanced tree ripening
Explanation:
Spongy tissue is an internal physiological disorder associated particularly with 'Alphonso' and is aggravated by advanced on-tree ripening. Harvesting physiologically mature fruits before they become tree-ripe reduces risk.
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57Mango fruits develop blackening at the distal end only in the portion of an orchard nearest a brick kiln, while leaves show little disease development. Which response best fits the diagnosis?
Mango
Hard
A.Reduce exposure to kiln fumes and use recommended borax sprays
B.Increase irrigation because calcium transport fails under mild drought
C.Remove affected panicles because the disorder is transmitted persistently by mango hoppers
D.Apply systemic fungicide because latent anthracnose causes black tip
Correct Answer: Reduce exposure to kiln fumes and use recommended borax sprays
Explanation:
Mango black tip is associated with toxic gases such as sulfur dioxide emitted by brick kilns. Avoiding kiln exposure is fundamental, and recommended borax sprays may reduce injury.
Incorrect! Try again.
58A banana field requires an effective dose of g per plant. If muriate of potash contains and field recovery is expected to be , how much fertilizer should be applied per plant?
Banana
Hard
A.300 g
B.450 g
C.375 g
D.240 g
Correct Answer: 375 g
Explanation:
Required fertilizer is g per plant. The calculation accounts for both fertilizer grade and expected field recovery.
Incorrect! Try again.
59A farmer establishing a virus-indexed banana plantation must choose between sword suckers, water suckers, and tissue-culture plants. Which material offers the best combination of health status and crop uniformity?
Banana
Hard
A.Large water suckers collected from several neighboring plantations
B.Unhardened tissue-culture plantlets transferred directly from culture vessels into the field
C.Hardened, indexed tissue-culture plants from a certified source
D.Flowered sword suckers retained with their entire pseudostems
Correct Answer: Hardened, indexed tissue-culture plants from a certified source
Explanation:
Certified, virus-indexed tissue-culture plants provide uniform planting material and reduce initial pathogen introduction. Proper hardening is essential before field establishment.
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