1. Cucumber belongs to which botanical family?
A. Solanaceae
B. Cucurbitaceae
C. Malvaceae
D. Fabaceae
Answer: B
Rationale: Cucumber is a member of the family Cucurbitaceae.
2. The botanical name of cucumber is:
A. Cucumis melo
B. Cucurbita pepo
C. Cucumis sativus
D. Lagenaria siceraria
Answer: C
Rationale: The cultivated cucumber is Cucumis sativus L.
3. Cucumber is mainly grown as a:
A. Root vegetable
B. Leafy vegetable
C. Fruit vegetable
D. Tuber crop
Answer: C
Rationale: The edible part is the immature fruit.
4. The center of origin of cucumber is:
A. Africa
B. South America
C. India
D. China
Answer: C
Rationale: India is considered the primary center of origin.
5. Cucumber is primarily a:
A. Self-pollinated crop
B. Cross-pollinated crop
C. Apomictic crop
D. Vegetatively propagated crop
Answer: B
Rationale: Cucumber is predominantly cross-pollinated by insects.
6. Major pollinating agents in cucumber are:
A. Wind
B. Water
C. Bees
D. Birds
Answer: C
Rationale: Bees are the main pollinators.
7. Cucumber plants are generally:
A. Monoecious
B. Dioecious
C. Hermaphrodite
D. Apomictic
Answer: A
Rationale: Male and female flowers occur on the same plant.
8. The sex ratio in cucumber is influenced mainly by:
A. Soil type
B. Temperature and photoperiod
C. Seed size
D. Root depth
Answer: B
Rationale: Temperature and day length affect male–female flower ratio.
9. Female flowers in cucumber can be identified by:
A. Larger petals
B. Presence of ovary at base
C. Longer pedicel
D. Brighter color
Answer: B
Rationale: Ovary at the base distinguishes female flowers.
10. The fruit of cucumber is botanically a:
A. Berry
B. Capsule
C. Pepo
D. Drupe
Answer: C
Rationale: Cucurbits produce pepo-type fruits.
11. Chromosome number of cucumber is:
A. 2n = 14
B. 2n = 16
C. 2n = 24
D. 2n = 48
Answer: A
Rationale: Cucumber has 2n = 14 chromosomes.
12. Cucumber is best grown during:
A. Cool winter season
B. Hot dry season
C. Warm season
D. Frosty season
Answer: C
Rationale: Cucumber is a warm-season crop.
13. Optimum temperature for cucumber growth is:
A. 10–15°C
B. 15–20°C
C. 20–30°C
D. 35–40°C
Answer: C
Rationale: Growth is optimum between 20–30°C.
14. Cucumber is highly sensitive to:
A. Drought
B. Salinity
C. Frost
D. Wind
Answer: C
Rationale: Frost causes severe damage to cucumber plants.
15. Best soil for cucumber cultivation is:
A. Heavy clay
B. Sandy loam
C. Waterlogged soil
D. Acidic peat
Answer: B
Rationale: Sandy loam soils with good drainage are ideal.
16. Ideal soil pH for cucumber is:
A. 4.0–4.5
B. 5.0–5.5
C. 6.0–6.8
D. 8.0–9.0
Answer: C
Rationale: Slightly acidic to neutral soils are preferred.
17. Recommended seed rate for cucumber is:
A. 0.5–1.0 kg/ha
B. 1.5–2.5 kg/ha
C. 4–5 kg/ha
D. 8–10 kg/ha
Answer: B
Rationale: About 2 kg seed per hectare is sufficient.
18. Recommended spacing for cucumber is:
A. 30 × 30 cm
B. 45 × 30 cm
C. 60 × 45 cm
D. 90 × 90 cm
Answer: C
Rationale: Adequate spacing promotes vine growth and fruiting.
19. Cucumber is commonly propagated by:
A. Cuttings
B. Layering
C. Seeds
D. Grafting
Answer: C
Rationale: Seed propagation is standard.
20. The edible stage of cucumber fruit is:
A. Fully mature
B. Overripe
C. Immature tender stage
D. Dry stage
Answer: C
Rationale: Fruits are consumed when tender and immature.
21. Average yield of cucumber is:
A. 5–8 t/ha
B. 10–15 t/ha
C. 20–25 t/ha
D. 40–50 t/ha
Answer: C
Rationale: Under good management, yields reach 20–25 t/ha.
22. Cucumber requires maximum water during:
A. Germination
B. Vegetative stage
C. Flowering and fruiting
D. Maturity
Answer: C
Rationale: Moisture stress at flowering reduces fruit set.
23. Major nutrient requirement of cucumber is:
A. Nitrogen
B. Phosphorus
C. Potassium
D. Balanced NPK
Answer: D
Rationale: Balanced nutrients ensure good yield and quality.
24. Excess nitrogen in cucumber causes:
A. Early flowering
B. More female flowers
C. Excess vegetative growth
D. Improved fruit quality
Answer: C
Rationale: Excess nitrogen promotes vines at the cost of fruits.
25. Application of ethrel in cucumber results in:
A. More male flowers
B. More female flowers
C. Reduced flowering
D. Sterility
Answer: B
Rationale: Ethrel promotes femaleness.
26. Gibberellic acid (GA₃) application in cucumber promotes:
A. Female flowers
B. Male flowers
C. Fruit drop
D. Seedlessness
Answer: B
Rationale: GA₃ increases male flower production.
27. Major pest of cucumber is:
A. Fruit fly
B. Aphid
C. Red pumpkin beetle
D. Stem borer
Answer: C
Rationale: Red pumpkin beetle is a serious cucurbit pest.
28. Fruit fly damage is characterized by:
A. Leaf curling
B. Holes with rotting
C. Yellow patches
D. Wilting
Answer: B
Rationale: Larvae feed inside fruits causing rotting.
29. Downy mildew of cucumber is caused by:
A. Alternaria spp.
B. Pseudoperonospora cubensis
C. Fusarium spp.
D. Erysiphe spp.
Answer: B
Rationale: Downy mildew is caused by P. cubensis.
30. Powdery mildew in cucumber is caused by:
A. Erysiphe cichoracearum
B. Phytophthora spp.
C. Colletotrichum spp.
D. Rhizoctonia solani
Answer: A
Rationale: Powdery mildew fungi attack cucurbits.
31. Mosaic disease in cucumber is transmitted by:
A. Whitefly
B. Aphid
C. Thrips
D. Leafhopper
Answer: B
Rationale: Aphids transmit cucumber mosaic virus.
32. Cucumber vines can be trained using:
A. Mulching
B. Staking and trellising
C. Pruning roots
D. Flood irrigation
Answer: B
Rationale: Training improves yield and fruit quality.
33. Harvesting of cucumber is done:
A. Once only
B. In multiple pickings
C. At full maturity
D. After seed hardening
Answer: B
Rationale: Fruits are harvested repeatedly.
34. Delay in harvesting cucumber leads to:
A. Increased sweetness
B. Improved market value
C. Seed hardening and bitterness
D. Higher yield
Answer: C
Rationale: Overmature fruits become bitter and seedy.
35. Bitterness in cucumber is due to:
A. Capsaicin
B. Solanine
C. Cucurbitacin
D. Alkaloids
Answer: C
Rationale: Cucurbitacin causes bitterness.
36. Cucumber roots are:
A. Deep tap root
B. Fibrous and shallow
C. Rhizomatous
D. Adventitious only
Answer: B
Rationale: Roots are shallow and sensitive to disturbance.
37. Cucumber seed type is:
A. Recalcitrant
B. Orthodox
C. Viviparous
D. Intermediate
Answer: B
Rationale: Seeds can be dried and stored.
38. Seed viability of cucumber is:
A. 1–2 years
B. 3–4 years
C. 6–8 years
D. 10 years
Answer: B
Rationale: Viability is generally 3–4 years.
39. Physiological disorder hollow heart in cucumber is related to:
A. Calcium deficiency
B. Boron deficiency
C. Rapid growth
D. Viral infection
Answer: C
Rationale: Rapid growth causes internal hollowness.
40. Cucumber flowers open mostly during:
A. Night
B. Early morning
C. Afternoon
D. Evening
Answer: B
Rationale: Anthesis occurs early morning.
41. Best method to increase fruit set in cucumber is:
A. Hand pollination
B. Bee activity
C. High nitrogen
D. Dense planting
Answer: B
Rationale: Pollinators ensure better fruit set.
42. Cucumber is unsuitable for:
A. Sandy loam soils
B. Well-drained soils
C. Waterlogged soils
D. Organic soils
Answer: C
Rationale: Waterlogging causes root rot.
43. Cucumber is classified as a:
A. Short-day plant
B. Long-day plant
C. Day-neutral plant
D. Shade-loving plant
Answer: C
Rationale: Cucumber is largely day-neutral.
44. The cotyledons in cucumber germination are:
A. Hypogeal
B. Epigeal
C. Underground
D. Non-functional
Answer: B
Rationale: Cotyledons emerge above soil.
45. Cucumber fruits develop from:
A. Superior ovary
B. Inferior ovary
C. Half-inferior ovary
D. Ovule only
Answer: B
Rationale: Cucurbits have an inferior ovary.
46. The main economic part of cucumber plant is:
A. Leaf
B. Stem
C. Immature fruit
D. Seed
Answer: C
Rationale: Tender fruits are marketed.
47. Cucumber is mainly consumed as:
A. Cooked vegetable
B. Salad vegetable
C. Dry spice
D. Beverage
Answer: B
Rationale: Cucumber is widely used in salads.
48. Cucumber requires isolation in seed production mainly due to:
A. Wind pollination
B. Cross-pollination by insects
C. Self-pollination
D. Apomixis
Answer: B
Rationale: Insect-mediated cross-pollination occurs.
49. Cucumber hybrids are preferred because they:
A. Require no fertilizer
B. Are seedless always
C. Have higher yield and uniformity
D. Are disease-free always
Answer: C
Rationale: Hybrids show heterosis.
50. Cucumber is economically important due to:
A. High oil content
B. Medicinal alkaloids
C. Fresh market demand and short duration
D. Fiber value
Answer: C
Rationale: Quick returns and high demand make it profitable.
%20(2).png)
0 Comments