Banana and citrus fruits
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Question No. 1
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The 'Kinnow' mandarin is a well-known hybrid variety developed from a cross between...
A.
King Sweet × Willow Leaf
B.
Coorg × Nagpur Santra
C.
Dancy × Clementine
D.
Satsuma × Ponkan
Question No. 2
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Which of the following banana diseases is caused by a virus and transmitted by the aphid Pentalonia nigronervosa?
A.
Panama wilt
B.
Moko disease
C.
Sigatoka leaf spot
D.
Bunchy top
Question No. 3
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Pre-harvest fruit drop in sweet oranges can be effectively managed by applying a spray of...
A.
Gibberellic acid @ 50 ppm
B.
2, 4-D @ 20 ppm
C.
Ethephon @ 100 ppm
D.
NAA @ 40 ppm
Question No. 4
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In banana cultivation, the term 'Peepers' refers to...
A.
Flowering buds
B.
Overly mature suckers
C.
Cut rhizomes used for propagation
D.
Young developing fruits
Question No. 5
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The pathogen Xanthomonas campestris pv. citri is responsible for causing which severe disease, especially in acid lime?
A.
Tristeza
B.
Gummosis
C.
Bacterial canker
D.
Greening
Question No. 6
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Most commercially cultivated banana varieties, such as Dwarf Cavendish, are genetically...
A.
Diploid
B.
Tetraploid
C.
Triploid
D.
Haploid
Question No. 7
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A physiological disorder in citrus known as 'Granulation', where juice vesicles become dry and hard, is often induced by...
A.
Low temperature and low humidity
B.
High temperature and high relative humidity
C.
Excessive nitrogen application
D.
Water scarcity
Question No. 8
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The rhizome weevil, Cosmopolitus sordidus, is a significant pest primarily because it is...
A.
A polyphagous pest attacking many crops
B.
A vector for Panama wilt
C.
A monophagous pest of banana
D.
A carrier of Moko disease
Question No. 9
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Which citrus variety is highly susceptible to the Tristeza virus and is therefore used as an 'indicator plant' for the disease?
A.
Valencia Late
B.
Kinnow
C.
Kagzi lime
D.
Satsuma
Question No. 10
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The seedless condition in the 'Chakradhar' variety is a notable trait of which citrus fruit?
A.
Sweet Orange
B.
Mandarin
C.
Grapefruit
D.
Acid lime
Question No. 11
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For optimal long-term storage of up to three weeks, banana fruits should be maintained at a temperature of...
A.
5 °C
B.
20 °C
C.
0 °C
D.
13 °C
Question No. 12
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The citrus greening disease, previously thought to be caused by a mycoplasma, is now known to be caused by...
A.
A viroid
B.
A fungus
C.
A gram-negative bacteria
D.
A protozoan
Question No. 13
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The propagation of most sweet orange varieties like 'Mosambi' and 'Satgudi' is commercially done through...
A.
Air layering
B.
Seeds
C.
Cuttings
D.
T budding or Patch budding
Question No. 14
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What is the recommended weight range for sword suckers used for propagating bananas?
A.
100-200 g
B.
1000-1200 g
C.
500-750 g
D.
250-400 g
Question No. 15
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The 'Die back' and 'Exanthema' physiological disorders in citrus trees are both associated with a deficiency of which micronutrient?
A.
Zinc
B.
Boron
C.
Copper
D.
Molybdenum
Question No. 16
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Which insect is the primary vector for the Tristeza virus in citrus orchards?
A.
Citrus Psylla
B.
Leaf Minor
C.
Fruit Sucking Moth
D.
Aphids (Toxoptera sp.)
Question No. 17
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Moko disease in banana is caused by a...
A.
Virus
B.
Fungus
C.
Bacteria
D.
Nematode
Question No. 18
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What is the primary reason that using acetylene for ripening bananas is not considered a good practice?
A.
It ripens the fruit too slowly.
B.
It can leave harmful residues and cause uneven ripening.
C.
It is more expensive than ethylene.
D.
It only works at very high temperatures.
Question No. 19
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In citrus fruits, the special kind of leathery fruit skin is botanically referred to as a...
A.
Pepo
B.
Hesperidium
C.
Drupe
D.
Berry
Question No. 20
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The 'yellow leaf' disorder in citrus is specifically attributed to a deficiency of which nutrient?
A.
Iron
B.
Magnesium
C.
Molybdenum
D.
Zinc
Question No. 21
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The citrus leaf minor (Phyllocnistis citrella) is a damaging pest on its own, but it also facilitates the spread of which disease?
A.
Gummosis
B.
Citrus canker
C.
Tristeza
D.
Greening
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