Mimosa Pudica Trivia Questions and Answers

1: What common name is Mimosa pudica known by that refers to its reaction to touch?
A: Sleepy plant
B: Touch-me-not
C: Action plant
D: Humble plant
Correct Answer: B
Explanation: Mimosa pudica is often called “touch-me-not” because its leaves fold inward when touched.

2: What family does Mimosa pudica belong to?
A: Rosaceae
B: Fabaceae
C: Asteraceae
D: Solanaceae
Correct Answer: B
Explanation: Mimosa pudica is part of the Fabaceae, or pea/legume family.

3: What type of movement is shown by the leaves of Mimosa pudica when touched?
A: Phototropic movement
B: Nyctinastic movement
C: Seismonastic movement
D: Geotropic movement
Correct Answer: C
Explanation: The leaves of Mimosa pudica exhibit seismonastic movement, which occurs in response to mechanical stimuli like touch.

4: Who first studied the “sleep” or nyctinastic movement of Mimosa pudica?
A: Charles Darwin
B: Carl Linnaeus
C: Jean-Jacques d’Ortous
D: Gregor Mendel
Correct Answer: C
Explanation: Nyctinastic movements in Mimosa pudica were studied by French scientist Jean-Jacques d’Ortous.

5: Which part of the Mimosa pudica plant is primarily responsible for the drooping response?
A: Petiole
B: Pulvinus
C: Leaf Blade
D: Stem
Correct Answer: B
Explanation: The pulvinus, a swollen base at the attachment of the leaflets, is responsible for the drooping response.

6: What is the conservation status of Mimosa pudica according to the IUCN?
A: Endangered
B: Vulnerable
C: Least Concern
D: Near Threatened
Correct Answer: C
Explanation: Mimosa pudica is listed as “Least Concern” on the IUCN Red List.

7: Who formally described Mimosa pudica in 1753?
A: Jean-Jacques d’Ortous
B: Carl Linnaeus
C: Charles Darwin
D: Gregor Mendel
Correct Answer: B
Explanation: Carl Linnaeus first formally described Mimosa pudica in his work “Species Plantarum.”

8: What color are the flowers of Mimosa pudica?
A: Blue
B: Yellow
C: Pink to purple
D: White
Correct Answer: C
Explanation: The flowers of Mimosa pudica are typically pale pink or purple.

9: What is the primary way Mimosa pudica seeds are stimulated to end dormancy and germinate?
A: High temperatures
B: Low nutrient soil
C: High soil acidity
D: Mechanical touch
Correct Answer: A
Explanation: High temperatures are the main stimuli that cause Mimosa pudica seeds to end dormancy and germinate.

10: In what types of regions is Mimosa pudica considered invasive?
A: Arctic regions
B: Tropical and subtropical regions
C: Mediterranean regions
D: Desert regions
Correct Answer: B
Explanation: Mimosa pudica is considered invasive in tropical and subtropical regions.

11: Which part of the plant’s flower is red in its upper part?
A: Floret petals
B: Stamens
C: Sepals
D: Pistil
Correct Answer: A
Explanation: The floret petals of Mimosa pudica are red in their upper part.

12: What do the roots of Mimosa pudica produce to prevent certain fungi from growing?
A: Carbon disulfide
B: Nitric acid
C: Sodium chloride
D: Calcium carbonate
Correct Answer: A
Explanation: The roots produce carbon disulfide, which prevents certain pathogenic and mycorrhizal fungi from growing.

13: What shape are the pollen grains of Mimosa pudica?
A: Hexagonal
B: Circular
C: Triangular
D: Star-shaped
Correct Answer: B
Explanation: The pollen grains of Mimosa pudica are circular.

14: What type of bacteria can fix nitrogen in the root nodules of Mimosa pudica?
A: Rhizobium
B: Streptococcus
C: Bacillus
D: Diazotrophs
Correct Answer: D
Explanation: Diazotrophs are bacteria that can fix atmospheric nitrogen in the root nodules of Mimosa pudica.

15: What is the main structure responsible for mechanically stimulated drooping in Mimosa pudica?
A: Chloroplasts
B: Pulvinus
C: Epidermis
D: Xylem
Correct Answer: B
Explanation: The pulvinus at the base of leaflets is primarily responsible for drooping in response to mechanical stimuli.

16: What is one benefit Mimosa pudica has gained from the Royal Horticultural Society?
A: Plant of the Year Award
B: Britton’s Award
C: Garden Appreciation Medal
D: Award of Garden Merit
Correct Answer: D
Explanation: Mimosa pudica has gained the Royal Horticultural Society’s Award of Garden Merit.

17: What is the common name for the bacteria-beneficial relationship found in the root nodules of Mimosa pudica?
A: Parasitism
B: Mutualism
C: Commensalism
D: Predation
Correct Answer: B
Explanation: The bacteria and the plant have a mutualistic relationship where the bacteria fix nitrogen for the plant, benefiting both.

18: What two stimuli can cause the leaflets of Mimosa pudica to close besides touch?
A: Warming and blowing
B: Light and darkness
C: Sound and vibration
D: Gravity and humidity
Correct Answer: A
Explanation: The leaflets of Mimosa pudica close in response to warming and blowing as well as touch.

19: Which mariner was involved in the distribution of Mimosa pudica outside its native range?
A: Charles Darwin
B: Ernest Shackleton
C: Christopher Columbus
D: James Cook
Correct Answer: C
Explanation: Christopher Columbus is associated with the distribution of several plant species outside their native ranges, including Mimosa pudica.

20: What insect often wraps Mimosa pudica leaflets in webs, interfering with their closing response?
A: Spider mites
B: Aphids
C: Beetles
D: Grasshoppers
Correct Answer: A
Explanation: Spider mites wrap the leaflets in webs, which hinders the closing response of Mimosa pudica.

21: What alkaloid is present in Mimosa pudica that has antiproliferative effects?
A: Caffeine
B: Mimosine
C: Morphine
D: Nicotine
Correct Answer: B
Explanation: The plant contains mimosine, a toxic alkaloid with antiproliferative effects.

22: For which type of crops can Mimosa pudica be a particular weed problem?
A: Rice
B: Tropical crops like corn and coconuts
C: Wheat
D: Potatoes
Correct Answer: B
Explanation: Mimosa pudica can be a weed problem for tropical crops such as corn, coconuts, and coffee.

23: What does Mimosa pudica transform atmospheric nitrogen into?
A: Ammonia
B: Oxygen
C: Water
D: Usable nitrogen compounds
Correct Answer: D
Explanation: Nitrogen-fixing bacteria on the roots convert atmospheric nitrogen into forms usable by plants.

24: Which toxin’s lethality does the root extract of Mimosa pudica neutralize?
A: Brown recluse spider venom
B: Rattlesnake venom
C: Black widow spider venom
D: Cobra venom
Correct Answer: D
Explanation: Aqueous extracts of the plant’s roots neutralize the venom of the monocled cobra.

25: What visible part of Mimosa pudica changes orientation during nyctinastic movement?
A: Flowers
B: Roots
C: Leaves
D: Stem
Correct Answer: C
Explanation: The leaves of Mimosa pudica change orientation, closing at night and reopening during the day.

26: Which significant ecological process does Mimosa pudica participate in due to its root nodules?
A: Photosynthesis
B: Nitrogen fixation
C: Respiration
D: Water transport
Correct Answer: B
Explanation: Mimosa pudica participates in nitrogen fixation through the bacteria in its root nodules.

27: Which compound type is responsible for the anti-inflammatory properties in Mimosa pudica?
A: Carbohydrates
B: Alkaloids
C: Proteins
D: Steroids
Correct Answer: B
Explanation: Alkaloids in the plant have shown anti-inflammatory properties.

28: What type of soil does Mimosa pudica generally prefer for growth?
A: Nutrient-rich soil
B: High pH soil
C: Nutrient-poor soil with good drainage
D: Peaty soil
Correct Answer: C
Explanation: Mimosa pudica grows most effectively in nutrient-poor, well-drained soil.

29: Which type of predators does Mimosa pudica face?
A: Deer and rabbits
B: Spider mites and mimosa webworms
C: Birds
D: Small rodents
Correct Answer: B
Explanation: Spider mites and mimosa webworms are natural predators of the plant.

30: In which part of the world is Mimosa pudica considered an invasive species?
A: Scandinavia
B: Southern United States
C: Antarctica
D: Northern Europe
Correct Answer: B
Explanation: Mimosa pudica is regarded as an invasive species in the southern United States.

31: Which historical botanist used Mimosa pudica in early experiments on plant habituation?
A: Gregor Mendel
B: Wilhelm Pfeffer
C: George Washington Carver
D: Carl Linnaeus
Correct Answer: B
Explanation: Wilhelm Pfeffer used Mimosa pudica in experiments on plant habituation.

32: How do the root nodules of Mimosa pudica contribute to the environment?
A: Increasing soil salinity
B: Fixing nitrogen
C: Acidifying the soil
D: Decreasing water retention
Correct Answer: B
Explanation: The root nodules fix nitrogen, making it available to the plant and enriching the soil.

33: What primary defense mechanism is thought to be associated with Mimosa pudica’s leaf closing?
A: Reducing water loss
B: Repelling herbivores
C: Attracting pollinators
D: Enhancing photosynthesis
Correct Answer: B
Explanation: The leaf-closing mechanism likely evolved as a defense against herbivores.

34: What year was Mimosa pudica described in “Species Plantarum”?
A: 1750
B: 1753
C: 1760
D: 1775
Correct Answer: B
Explanation: Carl Linnaeus described Mimosa pudica in “Species Plantarum” in 1753.

35: What is the name of the phenomenon where Mimosa pudica closes its leaves during darkness?
A: Tropism
B: Nyctinasty
C: Phototropism
D: Thigmonasty
Correct Answer: B
Explanation: Nyctinasty is the term for the movement of Mimosa pudica leaves closing during darkness.

36: In which award-winning territory of Australia is Mimosa pudica considered a declared weed?
A: Queensland
B: Western Australia
C: Northern Territory
D: Tasmania
Correct Answer: C
Explanation: Mimosa pudica is a declared weed in the Northern Territory of Australia.

37: Which element primarily triggers the end of seed dormancy in Mimosa pudica?
A: Soil acidity
B: High temperatures
C: Mechanical touch
D: Humidity
Correct Answer: B
Explanation: High temperatures primarily trigger the end of seed dormancy in Mimosa pudica.

38: What is the primary activity of the toxic alkaloid in Mimosa pudica?
A: Antiproliferative
B: Protein synthesis
C: Energy storage
D: Starch metabolism
Correct Answer: A
Explanation: The toxic alkaloid mimosine has antiproliferative effects.

39: Where did the first experiments showing Mimosa’s capacity for plant habituation take place?
A: France
B: Germany
C: Sweden
D: Italy
Correct Answer: B
Explanation: Wilhelm Pfeffer, a German botanist, first experimented with Mimosa’s capacity for habituation.

40: What special attribute of Mimosa pudica’s seed coat helps it survive harsh soil conditions?
A: Osmotic pressure resistance
B: High germination speed
C: Smooth texture
D: Acid-neutralizing capability
Correct Answer: A
Explanation: The hard seed coat restricts germination and makes the seed resistant to osmotic pressure.

41: Which part of the world has introduced Mimosa pudica but does not consider it invasive?
A: East Asia
B: Tanzania
C: New Zealand
D: Scotland
Correct Answer: A
Explanation: Mimosa pudica has been introduced to East Asia but is not considered invasive there.

42: What type of light condition does Mimosa pudica avoid?
A: Full sun
B: Partial shade
C: Full shade
D: Reflective light
Correct Answer: C
Explanation: Mimosa pudica is intolerant to shade and prefers sunny conditions.

43: What is the main role of calcium ions in the leaf movement of Mimosa pudica?
A: Absorption of nutrients
B: Cellular depolarization
C: Electron transport
D: Cell wall synthesis
Correct Answer: B
Explanation: Calcium ions are involved in cellular depolarization, initiating the action potential for leaf movements.

44: What type of scientific experiment suggested that Mimosa pudica could distinguish between a water drop and a finger touch?
A: Photosynthesis measurement
B: Genetic sequencing
C: Stimulus-response tests
D: Radioactive tracing
Correct Answer: C
Explanation: Stimulus-response tests in 1965 demonstrated that Mimosa pudica could distinguish between different stimuli.

45: In low-nutrient soils, what is one positive impact Mimosa pudica can have?
A: Increasing erosion
B: Reducing soil fertility
C: Adding nitrogen content
D: Promoting fungal growth
Correct Answer: C
Explanation: Mimosa pudica can increase nitrogen content in low-nutrient soils through nitrogen fixation.

46: What property allows Mimosa pudica to grow in eroded subsoils?
A: Frost resilience
B: Shade tolerance
C: Nitrogen fixation
D: High nutrient requirement
Correct Answer: C
Explanation: Mimosa pudica can grow in eroded subsoils due to its nitrogen-fixing capability.

47: How does Mimosa pudica respond differently to being dropped and being shaken after habituation?
A: Shows increased growth
B: Shows full resistance to both
C: Does not fold leaves when dropped but does when shaken
D: Does not respond to either stimulus
Correct Answer: C
Explanation: After habituation, Mimosa pudica does not fold its leaves when dropped, but still responds when shaken.

48: What allows Mimosa pudica to manage photosynthetic efficiency despite its folding behavior?
A: Varied light conditions
B: Secondary chloroplasts
C: Rapid reopening of leaves
D: No impact on photosynthesis
Correct Answer: C
Explanation: The plant quickly reopens its leaves after folding, minimizing the impact on photosynthesis.

49: Which other plant did neuroscientist Greg Gage connect Mimosa pudica to in an experiment using an electrocardiogram?
A: Sundew
B: Pitcher plant
C: Venus flytrap
D: Rafflesia
Correct Answer: C
Explanation: Greg Gage conducted an experiment linking Mimosa pudica with a Venus flytrap to study their response to electrical stimuli.

50: What happens to Mimosa pudica when anesthetics like ether are applied?
A: Growth accelerates
B: Narcosis of the motor organs
C: Leaves turn yellow
D: Increased seed production
Correct Answer: B
Explanation: Anesthetics cause narcosis of the motor organs in Mimosa pudica.

51: What environmental factor greatly influences the photosynthetic activity of Mimosa pudica?
A: Soil pH
B: Water availability
C: Light conditions
D: Pollinator presence
Correct Answer: C
Explanation: Light conditions play a major role in the photosynthetic activity of Mimosa pudica because the plant is shade-intolerant.

52: How long did Mimosa pudica retain memory of habituation in experiments?
A: 7 days
B: 14 days
C: 28 days
D: 60 days
Correct Answer: C
Explanation: Experiments suggested that Mimosa pudica retained memory of habituation for at least 28 days.

53: In what manner do the roots of Mimosa pudica affect soil chemistry?
A: By increasing nitrogen and potassium levels
B: By reducing potassium levels
C: By lowering soil pH
D: By increasing soil salinity
Correct Answer: A
Explanation: The roots can increase nitrogen and potassium levels in the soil they invade.

54: What was the focus of the study published by the Universities of Palermo and Lugano in 2018 regarding Mimosa pudica?
A: Plant photosynthesis
B: Use as building blocks for two-color displays
C: Enhancing soil fertility
D: Pest resistance
Correct Answer: B
Explanation: The study focused on using Mimosa pudica for creating plant-based controllable two-color displays.

55: What is the main disadvantage of Mimosa pudica folding its leaves?
A: Increased pest attacks
B: Reduced water retention
C: Lower photosynthetic rate
D: Higher nutrient loss
Correct Answer: C
Explanation: Folding its leaves interferes with the process of photosynthesis, reducing the plant’s photosynthetic rate.

56: What compound relates to the antioxidant properties found in Mimosa pudica?
A: Vitamin C
B: Tannin
C: Carotenoid
D: Anthocyanin
Correct Answer: B
Explanation: Tannins and other compounds in Mimosa pudica contribute to its antioxidant properties.

57: What is the main way Mimosa pudica is propagated?
A: Cuttings
B: Grafting
C: Seed
D: Root division
Correct Answer: C
Explanation: Mimosa pudica is most often propagated by seed.

58: What evidence suggested habitual learning in Mimosa pudica plants?
A: Lack of leaf movement in light
B: Repeated exposure to stimuli without response
C: Structural changes in roots
D: Increased growth rate
Correct Answer: B
Explanation: The plants ceased to react after repeated exposure to certain stimuli, suggesting habitual learning.

59: The sensitivity of Mimosa pudica to touch is compared to which other plant?
A: Pitcher Plant
B: Rafflesia
C: Venus Flytrap
D: Orchid
Correct Answer: C
Explanation: Mimosa pudica’s sensitivity to touch is often compared to that of the Venus Flytrap.

60: Which significant scientific journal published a study on Mimosa pudica in 2022?
A: Science
B: Nature Communications
C: The Lancet
D: Cell
Correct Answer: B
Explanation: A study was published in “Nature Communications” focusing on Mimosa pudica’s Ca2+ coupled signals and rapid movements.

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