Haworthia Trivia Questions and Answers

1: What is the kingdom classification of Haworthia plants?
A: Fungi
B: Plantae
C: Protista
D: Animalia
Correct Answer: B
Explanation: Haworthia plants belong to the kingdom Plantae, which encompasses all plants.

2: In which part of the world are Haworthia plants naturally found?
A: South America
B: Southern Africa
C: Southeast Asia
D: North America
Correct Answer: B
Explanation: Haworthia plants are endemic to Southern Africa, including countries like Mozambique, Namibia, Lesotho, Eswatini, and South Africa.

3: Who discovered the Haworthia genus?
A: Carl Linnaeus
B: Henri Auguste Duval
C: Charles Darwin
D: Gregor Mendel
Correct Answer: B
Explanation: Henri Auguste Duval discovered the Haworthia genus in 1809.

4: After whom is the Haworthia genus named?
A: Charles Smith
B: Adrian Hardy Haworth
C: Martha Collins
D: Gregor Mendel
Correct Answer: B
Explanation: The genus is named after Adrian Hardy Haworth, a botanist and succulent collector.

5: What is the typical diameter range of Haworthia rosettes?
A: 1 cm to 5 cm
B: 3 cm to 30 cm
C: 10 cm to 20 cm
D: 15 cm to 40 cm
Correct Answer: B
Explanation: Haworthia rosettes typically range from 3 cm to 30 cm in diameter, depending on the species.

6: How high can inflorescences of some Haworthia species grow?
A: 10 cm
B: 20 cm
C: 30 cm
D: 40 cm
Correct Answer: D
Explanation: The inflorescences of some Haworthia species may exceed 40 cm in height.

7: Which subfamily does the Haworthia genus belong to?
A: Alooideae
B: Asphodeloideae
C: Cactoideae
D: Bromelioideae
Correct Answer: B
Explanation: Haworthia belongs to the subfamily Asphodeloideae.

8: How do Haworthia plants typically reproduce?
A: Only by seeds
B: Only by budding
C: Both by seeds and budding
D: Only through cuttings
Correct Answer: C
Explanation: Haworthia species reproduce both through seed and budding, or offsets.

9: Which color are the flowers of most Haworthia species?
A: Red
B: Yellow
C: White
D: Blue
Correct Answer: C
Explanation: The flowers of most Haworthia species are generally white.

10: What type of plants are Haworthia, Aloe, and Gasteria?
A: Succulent
B: Herbaceous
C: Woody
D: Aquatic
Correct Answer: A
Explanation: Haworthia, Aloe, and Gasteria are all types of succulent plants.

11: What happens to Haworthia plants when they are deprived of water?
A: They grow taller
B: Their colors change
C: They produce more flowers
D: They lose their leaves
Correct Answer: B
Explanation: When stressed (e.g., deprived of water), Haworthia plants can change colors to reds and purples.

12: What is a characteristic feature of many Haworthia leaves?
A: Soft and smooth
B: Tough and fleshy
C: Thin and papery
D: Hairy and rough
Correct Answer: B
Explanation: Many species of Haworthia have firm, tough, and fleshy leaves.

13: What type of soil conditions do Haworthia plants prefer?
A: Wet and swampy
B: Extremely well-drained
C: Rich and loamy
D: Clayey and compact
Correct Answer: B
Explanation: Haworthia species favor extremely well-drained soil, often growing in poor sands and rocky areas.

14: In which USDA zone are Haworthia plants rated as winter hardy?
A: Zone 5
B: Zone 8
C: Zone 10
D: Zone 12
Correct Answer: C
Explanation: Haworthia plants are rated as winter hardy to USDA zone 10.

15: What happens to Haworthia plants if they are over-watered?
A: They grow faster
B: They rot
C: They flower more
D: They become frost-resistant
Correct Answer: B
Explanation: Over-watering can cause the roots of Haworthia plants to rot.

16: Why are Haworthia plants generally grown in semi-shade conditions?
A: They have a high sun tolerance
B: They thrive under full-sun exposure
C: They naturally grow under bushes or rock overhangs
D: They do not need sunlight
Correct Answer: C
Explanation: Haworthia plants are naturally adapted to grow in semi-shade conditions, often under bushes or rock overhangs.

17: Which horticultural method is less reliable for propagating Haworthia plants?
A: Offset production
B: Leaf cuttings
C: Seed germination
D: Tissue culture
Correct Answer: B
Explanation: Propagation through leaf cuttings is less reliable compared to other methods.

18: How were the differences in the flowers of the Haworthia subgenera previously considered by botanists?
A: Extremely significant
B: Inconsequential
C: Highly noticeable
D: Completely identical
Correct Answer: B
Explanation: Botanists had previously considered the differences in the flowers of the Haworthia subgenera to be inconsequential.

19: What is the smallest Haworthia species?
A: Haworthia cooperi
B: Haworthia parksiana
C: Haworthia retusa
D: Haworthia truncata
Correct Answer: B
Explanation: Haworthia parksiana is known as the smallest Haworthia species.

20: What feature do the leaves of Haworthia cooperi have?
A: Opaque and tough
B: Translucent “window” panels
C: Completely smooth
D: Covered in spines
Correct Answer: B
Explanation: Haworthia cooperi leaves have translucent “window” panels at the tips.

21: Which species of Haworthia has light green, boat-shaped leaves?
A: Haworthia mirabilis
B: Haworthia cymbiformis
C: Haworthia retusa
D: Haworthia turgida
Correct Answer: B
Explanation: Haworthia cymbiformis has light green, boat-shaped leaves.

22: Which trait is found in Haworthia arachnoidea leaves?
A: Translucent tips
B: Dense hairy web of spines
C: Smooth and glossy
D: Thin and delicate
Correct Answer: B
Explanation: Haworthia arachnoidea has dark-green leaves that bear a dense hairy web of spines.

23: Which genus is a related genus to Haworthia?
A: Cactus
B: Fern
C: Aloe
D: Moss
Correct Answer: C
Explanation: Aloe is a related genus to Haworthia.

24: What type of leaves does Haworthia herbacea have?
A: Yellow-green with spined margins
B: Dark green and smooth
C: Red and translucent
D: Brown and rough
Correct Answer: A
Explanation: Haworthia herbacea has distinctive yellow-green leaves with spined margins.

25: What is a synonym for the genus Haworthia?
A: Apicra
B: Orchis
C: Echeveria
D: Sedum
Correct Answer: A
Explanation: Apicra is a synonym for the genus Haworthia.

26: What is the height that some Haworthia stems can reach?
A: 10 cm
B: 20 cm
C: 50 cm
D: 70 cm
Correct Answer: C
Explanation: Some Haworthia species have stems that can reach up to 50 cm.

27: What do wide variations within a Haworthia species primarily occur in?
A: Flowers
B: Leaves
C: Stems
D: Roots
Correct Answer: B
Explanation: Wide variations occur in the leaves even within one species of Haworthia.

28: What adaptive feature do the leaves of some Haworthia have for sunlight exposure?
A: Spiny tips
B: Leaf windows with translucent panels
C: Thick waxy coating
D: Broad and flat shape
Correct Answer: B
Explanation: Some Haworthia leaves contain leaf windows with translucent panels allowing sunlight to reach internal photosynthetic tissues.

29: How did recent phylogenetic studies categorize traditional divisions of Haworthia?
A: Perfectly matched
B: Completely identical
C: Relatively unrelated
D: Highly related
Correct Answer: C
Explanation: Recent phylogenetic studies have shown traditional divisions of Haworthia to be relatively unrelated.

30: Which subfamily is Haworthia a part of?
A: Asparagoideae
B: Asphodeloideae
C: Faboideae
D: Bromelioideae
Correct Answer: B
Explanation: Haworthia is part of the subfamily Asphodeloideae.

31: How are the flowers of Haworthia cymbiformis described?
A: Large and bold
B: Tiny and white
C: Red and spiky
D: Blue and bell-shaped
Correct Answer: B
Explanation: Flowers of Haworthia cymbiformis are small and generally white.

32: What are the roots, leaves, and rosettes of Haworthia known to demonstrate?
A: Homogeneity across species
B: Generic differences
C: Completely identical traits
D: Indifference between species
Correct Answer: B
Explanation: The roots, leaves, and rosettes of Haworthia demonstrate some generic differences.

33: Which genus has Haworthia been closely related to in astrophytography studies?
A: Astroloba
B: Cactus
C: Echeveria
D: Sedum
Correct Answer: A
Explanation: Haworthia has been shown to be more closely related to the genus Astroloba in phylogenetic studies.

34: How many species did B. Bayer recognize in a review of Haworthia in 2012?
A: Approximately 20
B: Approximately 40
C: Approximately 60
D: Approximately 80
Correct Answer: C
Explanation: B. Bayer recognized approximately 60 species in a review of the Haworthia genus in 2012.

35: What is a notable trait of Haworthia reticulata leaves?
A: Red and thorny
B: Tiny teeth with a reticulated pattern
C: Flat and oval
D: Glossy and smooth
Correct Answer: B
Explanation: Haworthia reticulata leaves bear tiny teeth and have a reticulated pattern.

36: What happens to Haworthia leaves when deprived of nitrogen?
A: Turn darker green
B: Turn paler
C: Grow faster
D: Grow thornier
Correct Answer: B
Explanation: Depriving Haworthia plants of nitrogen generally results in paler leaves.

37: In which provinces is Haworthia chloracantha found?
A: Eastern Cape Provinces
B: Southwestern Cape Provinces
C: Southern Cape Provinces
D: Western Cape Provinces
Correct Answer: B
Explanation: Haworthia chloracantha is found in the Southwestern Cape Provinces.

38: Which method is used less frequently for Haworthia propagation?
A: Offsets
B: Seed propagation
C: Leaf cuttings
D: Tissue culture
Correct Answer: C
Explanation: Leaf cuttings are less reliably used for propagating Haworthia plants.

39: What climate zone do Haworthia plants not tolerate?
A: Zone 5
B: Zone 8
C: Zone 12
D: Frost conditions
Correct Answer: D
Explanation: Haworthia plants are sensitive to frost and do not tolerate frost conditions.

40: What is the color of Haworthia magnifica var. atrofusca leaves?
A: Light green
B: Dark reddish-brown
C: Bright yellow
D: Blue-green
Correct Answer: B
Explanation: Haworthia magnifica var. atrofusca has very dark, reddish-brown, rough-surfaced leaves.

41: Which species co-occurs with Haworthia herbacea?
A: Haworthia parksiana
B: Haworthia marumiana
C: Haworthia pubescens
D: Haworthia emelyae
Correct Answer: C
Explanation: Haworthia pubescens co-occurs with H. herbacea.

42: What is common among many Haworthia flowers?
A: Blue and bell-shaped
B: Yellow and waxy
C: Brown striations in some species
D: Red and thorny
Correct Answer: C
Explanation: Many Haworthia flowers have brown striations, and species in the section Hexangulares generally have green striations.

43: Which species of Haworthia can tolerate full-sun conditions?
A: Haworthia arachnoidea
B: Haworthia cymbiformis
C: Haworthia pumila
D: Haworthia chloracantha
Correct Answer: C
Explanation: Haworthia pumila can be adapted to tolerate full-sun conditions.

44: How are Haworthia retusa leaves described?
A: Retuse with a recognisable shiny leaf-face
B: Spiny with red tips
C: Thin and transparent
D: Thick and rough
Correct Answer: A
Explanation: Haworthia retusa has a recognizable shiny leaf-face on its retuse leaves.

45: Which subgenus of Haworthia is shown to be a sister-group of genus Gasteria in phylogenetic studies?
A: Robustipedunculares
B: Subgenerum
C: Hexangulares
D: Haworthia proper
Correct Answer: C
Explanation: The subgenus Hexangulares was shown to be a sister-group of genus Gasteria.

46: What did recent phylogenetic studies demonstrate about the traditional divisions of Haworthia?
A: Highly accurate
B: Consistent
C: Relatively unrelated
D: Extremely similar
Correct Answer: C
Explanation: Studies have shown that the traditional divisions of the genus are relatively unrelated.

47: What can be inferred about the demand for certain Haworthia species?
A: They are not desired
B: They are fairly common house and garden plants
C: They are mainly wild plants
D: They have no horticultural interest
Correct Answer: B
Explanation: Certain Haworthia species, like Haworthia cymbiformis, are popular as house and garden plants.

48: What is a distinctive feature of Haworthia margaritifera leaves?
A: Small and red
B: Fleshy and yellow
C: Covered in small white dots
D: Translucent and thin
Correct Answer: C
Explanation: Haworthia margaritifera leaves are covered in small white dots.

49: What type of conditions are Haworthia emelyae leaves adapted to?
A: Completely dry
B: Full sunlight
C: Semi-shade conditions
D: Constant rain
Correct Answer: C
Explanation: Most Haworthia species, including Haworthia emelyae, are naturally adapted to semi-shade conditions.

50: Which Haworthia species has tiny, rounded, bulging leaves?
A: Haworthia turgida
B: Haworthia parksiana
C: Haworthia springbokvlakensis
D: Haworthia attenuata
Correct Answer: C
Explanation: Haworthia springbokvlakensis has round, bulging, translucent leaf faces.

51: Which type of research has reduced traditional misunderstandings about Haworthia taxonomy?
A: Ethnobotany
B: Phylogenetic studies
C: Economic botany
D: Horticultural analysis
Correct Answer: B
Explanation: Recent phylogenetic studies have helped correct traditional misunderstandings about Haworthia taxonomy.

52: What is a prominent characteristic of Haworthia truncata?
A: Horse’s teeth appearance
B: Thin and translucent
C: Completely smooth
D: Red-spotted leaves
Correct Answer: A
Explanation: Haworthia truncata is often called “horse’s teeth” due to its distinctive leaf shape.

53: What are offsets in the context of Haworthia plants?
A: Growth of the main plant
B: New roots from the same plant
C: Buds or side shoots that develop into new plants
D: Old leaves falling off
Correct Answer: C
Explanation: Offsets in Haworthia plants are buds or side shoots that develop into new plants.

54: What is an example of a hybrid Haworthia species?
A: Haworthia parksiana
B: Haworthia retusa
C: × Apworthia
D: Haworthia emelyae
Correct Answer: C
Explanation: × Apworthia is an example of an intergeneric hybrid involving Haworthia.

55: Historically, how was the classification of Asphodeloideae subfamily, including Haworthia, regarded?
A: Strongly established
B: Well substantiated
C: Weakly contrived
D: Completely understood
Correct Answer: C
Explanation: The classification of Asphodeloideae subfamily, including Haworthia, has been considered weakly contrived.

56: Which cultivation condition is unsuitable for most Haworthia species?
A: Semi-shade
B: Extremely well-drained soil
C: Frost exposure
D: Regular watering
Correct Answer: C
Explanation: Most Haworthia plants are sensitive to frost and unsuitable for cold, frosty conditions.

57: What kind of pattern does Haworthia magnifica var. splendens display?
A: Completely smooth
B: Flecked leaves
C: Solid color
D: Spotted tips
Correct Answer: B
Explanation: Haworthia magnifica var. splendens displays flecked leaves.

58: How many accepted species of Haworthia were listed in The Plant List (2013)?
A: About 50
B: About 100
C: About 150
D: About 200
Correct Answer: C
Explanation: The Plant List (2013) contains about 150 accepted species of Haworthia.

59: Which species of Haworthia has a form known as “Haworthia splendens”?
A: Haworthia turgida
B: Haworthia cooperi
C: Haworthia magnifica
D: Haworthia cymbiformis
Correct Answer: C
Explanation: Haworthia magnifica var. splendens is a particularly ornate variety prized by horticulturalists.

60: What naturally causes Haworthia semiviva to dry its leaves into a papery sheath?
A: Winter frost
B: Lack of sunlight
C: Heat of summer
D: Excess nitrogen
Correct Answer: C
Explanation: Haworthia semiviva dries its leaves into a papery sheath in response to the summer heat.

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