Explore 100+ multiple-choice questions (MCQs) on “Super Senses – How do plants and animals sense their surroundings” for All India Sainik School Entrance Exam Class VI General Knowledge Syllabus (AISSEE). Study Material Includes answers and explanations to enhance learning.
Super Senses (How do plants and animals sense their surroundings) – MCQs for AISSEE Class 6
1. Which of the following senses is the most developed in dogs?
A) Sight
B) Hearing
C) Smell
D) Taste
Answer: C) Smell
Explanation: Dogs have an extraordinary sense of smell, which is far stronger than that of humans. They use it for tracking, hunting, and detecting scents from great distances.
2. Why do elephants use infrasound?
A) To locate food
B) To communicate over long distances
C) To detect earthquakes
D) To scare predators
Answer: B) To communicate over long distances
Explanation: Elephants produce low-frequency sounds (infrasound) that travel long distances, helping them communicate with other herd members even when they are miles apart.
3. Which animal can see ultraviolet light?
A) Dogs
B) Humans
C) Bees
D) Elephants
Answer: C) Bees
Explanation: Bees can see ultraviolet (UV) light, which helps them locate flowers and nectar, as many flowers have UV patterns that guide pollinators.
4. How do bats navigate in the dark?
A) Using their eyes
B) Using echolocation
C) Following moonlight
D) By sensing vibrations
Answer: B) Using echolocation
Explanation: Bats emit high-frequency sound waves that bounce off objects and return to their ears, allowing them to create a mental map of their surroundings.
5. Why do snakes flick their tongues?
A) To catch prey
B) To smell the air
C) To produce venom
D) To scare predators
Answer: B) To smell the air
Explanation: Snakes use their tongues to collect scent particles from the air and analyze them using the Jacobson’s organ, helping them locate prey and detect threats.
Test Your Knowledge (Quiz)
16. Why do butterflies have compound eyes?
A) To detect heat from the sun
B) To see multiple directions at once
C) To detect sounds
D) To produce their own light
Answer: B) To see multiple directions at once
Explanation: Butterflies have compound eyes made up of thousands of tiny lenses that allow them to see in multiple directions, helping them avoid predators and locate flowers.
17. How do ants follow a trail?
A) By using their eyes
B) By following sound signals
C) By sensing pheromones
D) By following the wind direction
Answer: C) By sensing pheromones
Explanation: Ants release pheromones (chemical signals) along their path to create a trail that other ants can follow, ensuring efficient communication and food collection.
18. What helps migratory birds find their way?
A) Sense of smell
B) Magnetic field detection
C) Echolocation
D) Thermal vision
Answer: B) Magnetic field detection
Explanation: Many migratory birds use Earth’s magnetic field as a natural compass to navigate long distances during seasonal migration.
19. How do star-nosed moles sense their surroundings?
A) Using echolocation
B) Using sensitive tentacle-like structures
C) By sensing vibrations in water
D) By detecting infrared radiation
Answer: B) Using sensitive tentacle-like structures
Explanation: Star-nosed moles have 22 fleshy tentacle-like appendages on their nose that contain thousands of nerve endings, helping them detect prey and navigate underground.
20. What special ability do barn owls have?
A) They can see in complete darkness
B) They can turn their heads 360 degrees
C) They have asymmetrical ears for precise hearing
D) They can sense electric fields
Answer: C) They have asymmetrical ears for precise hearing
Explanation: Barn owls have one ear higher than the other, which allows them to pinpoint the exact location of sounds, making them excellent nocturnal hunters.
21. How do octopuses change their color?
A) By absorbing surrounding light
B) By changing their blood color
C) By expanding and contracting chromatophores
D) By controlling body temperature
Answer: C) By expanding and contracting chromatophores
Explanation: Octopuses have special pigment-containing cells called chromatophores, which they can expand or contract to change color and blend into their surroundings.
22. Which part of a fish helps it detect vibrations in water?
A) Gills
B) Fins
C) Lateral line
D) Scales
Answer: C) Lateral line
Explanation: The lateral line system is a series of sensory organs along a fish’s body that helps it detect movement and vibrations in water.
23. How do pigeons find their way home?
A) By following other birds
B) By using the Earth’s magnetic field
C) By memorizing landmarks
D) By detecting wind direction
Answer: B) By using the Earth’s magnetic field
Explanation: Pigeons have special magnetoreceptors in their brains that help them detect Earth’s magnetic field and navigate long distances.
24. What sense is strongest in wolves?
A) Sight
B) Hearing
C) Smell
D) Touch
Answer: C) Smell
Explanation: Wolves rely on their strong sense of smell to locate prey, communicate with pack members, and mark their territory.
25. How do jellyfish detect light?
A) Using their tentacles
B) Using their rhopalia
C) By detecting water temperature
D) By sensing vibrations
Answer: B) Using their rhopalia
Explanation: Jellyfish have specialized structures called rhopalia, which contain light-sensitive cells that help them detect light and navigate their environment.
26. What helps turtles return to their birthplace to lay eggs?
A) Following ocean currents
B) Using magnetic field detection
C) Remembering water temperature
D) Listening for sounds from the shore
Answer: B) Using magnetic field detection
Explanation: Sea turtles have an internal magnetic compass that helps them navigate across long distances and return to their birthplace for nesting.
27. How do male crickets produce their characteristic chirping sound?
A) By rubbing their hind legs together
B) By vibrating their wings
C) By clicking their jaws
D) By hitting objects
Answer: B) By vibrating their wings
Explanation: Male crickets rub a special part of their wings together to produce chirping sounds, which are used for attracting mates and communicating.
28. Which of the following animals is known for detecting prey using heat sensors?
A) Dolphins
B) Pit vipers
C) Penguins
D) Kangaroos
Answer: B) Pit vipers
Explanation: Pit vipers have heat-sensitive pits near their noses that allow them to detect warm-blooded prey even in complete darkness.
29. How do fireflies produce light?
A) By storing sunlight in their bodies
B) Through bioluminescence
C) By reflecting moonlight
D) By absorbing infrared rays
Answer: B) Through bioluminescence
Explanation: Fireflies produce light through a chemical reaction involving luciferase, which allows them to glow and communicate with other fireflies.
30. Why do dogs have wet noses?
A) To help them breathe better
B) To enhance their sense of smell
C) To keep their body cool
D) To attract other animals
Answer: B) To enhance their sense of smell
Explanation: A dog’s wet nose helps trap scent particles, making it easier for them to detect smells more accurately.
31. How do starfish sense their surroundings?
A) Using their central brain
B) Using eyespots on their arms
C) By sensing electric fields
D) Through sonar-like vibrations
Answer: B) Using eyespots on their arms
Explanation: Starfish have simple eyespots at the tips of their arms, which help them detect light and navigate their surroundings.
32. What special ability helps owls hear better than other birds?
A) Large earlobes
B) Asymmetrical ear placement
C) Infrared vision
D) Ultra-sensitive vocal cords
Answer: B) Asymmetrical ear placement
Explanation: Owls have ears positioned at different heights, allowing them to detect the exact location of sounds, which is especially useful for hunting at night.
33. How do frogs sense vibrations in the air?
A) Through their nostrils
B) Through their skin
C) Using their tympanum (eardrum)
D) By detecting air pressure changes
Answer: C) Using their tympanum (eardrum)
Explanation: Frogs have a tympanum (external eardrum) that detects sound vibrations, helping them communicate and detect predators.
34. Why do honeybees perform a waggle dance?
A) To attract mates
B) To warn about predators
C) To share the location of food sources
D) To cool the hive
Answer: C) To share the location of food sources
Explanation: Honeybees perform a waggle dance to inform other bees about the direction and distance of flowers rich in nectar and pollen.
35. How do crocodiles detect movement in water?
A) Using their eyes
B) Through vibration-sensitive receptors on their skin
C) By detecting changes in temperature
D) By sensing changes in air pressure
Answer: B) Through vibration-sensitive receptors on their skin
Explanation: Crocodiles have specialized pressure receptors on their jaws that allow them to detect the slightest movements in water, helping them locate prey even in the dark.
36. Which animal uses its tail as a warning signal?
A) Peacock
B) Squirrel
C) Rabbit
D) Elephant
Answer: B) Squirrel
Explanation: Squirrels flick their tails to warn other squirrels about approaching predators, signaling danger effectively.
37. How do mosquitoes find humans to bite?
A) By sensing vibrations
B) By detecting body heat and carbon dioxide
C) By following movement patterns
D) By seeing infrared light
Answer: B) By detecting body heat and carbon dioxide
Explanation: Mosquitoes are attracted to carbon dioxide exhaled by humans and detect body heat to locate blood meals.
38. What helps penguins navigate long distances in the ocean?
A) Their strong eyesight
B) Magnetic field detection
C) Sensing water salinity
D) Following the sun’s reflection
Answer: B) Magnetic field detection
Explanation: Penguins, like many migratory animals, can sense Earth’s magnetic field, which helps them navigate long distances in search of food and nesting grounds.
39. Why do rabbits have large ears?
A) To hear predators from a distance
B) To maintain balance
C) To regulate their body temperature
D) To improve night vision
Answer: A) To hear predators from a distance
Explanation: Rabbits have large ears that can rotate in different directions, allowing them to detect predators from far away and escape quickly.
40. How do earthworms sense light without eyes?
A) Through light-sensitive skin cells
B) By detecting vibrations
C) By feeling changes in temperature
D) By following the smell of soil
Answer: A) Through light-sensitive skin cells
Explanation: Earthworms lack eyes but have photoreceptor cells in their skin that help them detect light and avoid exposure to predators.
41. How do dolphins recognize each other?
A) By their body shape
B) By their unique whistles
C) By their movement patterns
D) By their sense of smell
Answer: B) By their unique whistles
Explanation: Dolphins use signature whistles, which act like names, to recognize and communicate with each other.
42. What helps a woodpecker avoid brain damage while pecking?
A) A hard skull
B) A cushion-like structure in the skull
C) Strong neck muscles
D) Large eyes
Answer: B) A cushion-like structure in the skull
Explanation: Woodpeckers have specialized shock-absorbing structures in their skulls that protect their brains from repeated impact.
43. How do snakes detect prey in total darkness?
A) By using heat-sensing pits
B) By sensing vibrations in the ground
C) By their keen eyesight
D) By smelling through their nostrils
Answer: A) By using heat-sensing pits
Explanation: Pit vipers and some other snakes have heat-sensitive pits near their nostrils, which help them detect warm-blooded prey in complete darkness.
44. Why do meerkats stand on their hind legs?
A) To regulate body temperature
B) To look for predators
C) To communicate with others
D) To attract mates
Answer: B) To look for predators
Explanation: Meerkats stand upright to scan their surroundings for predators and keep their group safe.
45. How do bats avoid obstacles while flying?
A) By using echolocation
B) By seeing in the dark
C) By detecting wind currents
D) By following other bats
Answer: A) By using echolocation
Explanation: Bats emit high-frequency sound waves that bounce off objects, helping them navigate in the dark.
46. Why do chameleons move their eyes independently?
A) To see in all directions at once
B) To confuse predators
C) To see different colors
D) To detect heat signals
Answer: A) To see in all directions at once
Explanation: Chameleons can move each eye independently, allowing them to scan their surroundings without moving their heads.
47. How do ants communicate with each other?
A) Through sound vibrations
B) By touching antennae
C) By releasing pheromones
D) By changing body color
Answer: C) By releasing pheromones
Explanation: Ants release chemical signals called pheromones to guide their fellow ants, mark trails, and warn of danger.
48. Why do fireflies glow?
A) To produce heat
B) To scare predators
C) To attract mates
D) To navigate in the dark
Answer: C) To attract mates
Explanation: Fireflies use bioluminescence to produce light, which helps them attract potential mates in the dark.
49. How do sea turtles find their way back to the beach where they were born?
A) By memorizing the stars
B) By detecting Earth’s magnetic field
C) By following ocean currents
D) By sensing water temperature
Answer: B) By detecting Earth’s magnetic field
Explanation: Sea turtles have an internal magnetic compass that allows them to navigate long distances and return to their birthplace for nesting.
50. Why do moths get attracted to light?
A) They use it for warmth
B) They mistake it for the moon
C) They need light for vision
D) They use it to detect predators
Answer: B) They mistake it for the moon
Explanation: Moths use the moon as a navigational guide, but artificial lights confuse them, causing them to spiral toward them.
51. How do electric eels detect prey?
A) By sensing vibrations
B) By generating electric fields
C) By using echolocation
D) By detecting body heat
Answer: B) By generating electric fields
Explanation: Electric eels produce electric fields around their bodies, which help them detect prey and navigate murky waters.
52. Why do owls have forward-facing eyes?
A) To improve night vision
B) To detect ultraviolet light
C) To have better depth perception
D) To sense heat from prey
Answer: C) To have better depth perception
Explanation: Owls have binocular vision, meaning both eyes focus on the same object, allowing them to judge distances accurately while hunting.
53. How do sharks sense tiny movements in water?
A) By using their gills
B) Through lateral line organs
C) By sensing vibrations through their teeth
D) By using their tails
Answer: B) Through lateral line organs
Explanation: Sharks have a lateral line system that detects movement and vibrations in the water, helping them locate prey even in low visibility.
54. How do spiders detect their prey?
A) By sensing vibrations in their webs
B) By seeing ultraviolet light
C) By producing high-frequency sounds
D) By detecting heat signatures
Answer: A) By sensing vibrations in their webs
Explanation: Spiders rely on vibrations in their webs to detect when prey gets trapped, allowing them to respond quickly.
55. Why do elephants flap their ears?
A) To communicate with other elephants
B) To detect sound waves
C) To cool their bodies
D) To scare predators
Answer: C) To cool their bodies
Explanation: Elephants have large ears with many blood vessels; flapping them helps release heat and regulate body temperature.
56. What sense helps homing pigeons return home?
A) A strong sense of smell
B) The ability to see magnetic fields
C) Their powerful wings
D) Their memory of landmarks
Answer: B) The ability to see magnetic fields
Explanation: Homing pigeons use Earth’s magnetic field as a natural compass to navigate long distances.
57. How do barn owls hunt in complete darkness?
A) By using echolocation
B) By detecting heat
C) By relying on their sharp eyesight
D) By using highly sensitive hearing
Answer: D) By using highly sensitive hearing
Explanation: Barn owls have asymmetrical ears that allow them to detect even the faintest sounds of prey moving in the dark.
58. How do snakes “smell” the air?
A) Through their nostrils
B) By flicking their tongues
C) By sensing chemical signals through their skin
D) By detecting heat
Answer: B) By flicking their tongues
Explanation: Snakes use their tongues to collect scent particles from the air and transfer them to the Jacobson’s organ for analysis.
59. Why do some frogs change color?
A) To regulate their body temperature
B) To communicate with other frogs
C) To camouflage with their surroundings
D) To scare predators
Answer: C) To camouflage with their surroundings
Explanation: Many frogs can change color to blend into their environment, helping them avoid predators.
60. How do bees sense the location of flowers?
A) By detecting smell
B) By seeing ultraviolet light
C) By using their antennae
D) All of the above
Answer: D) All of the above
Explanation: Bees use their sense of smell, ultraviolet vision, and antennae to find flowers and gather nectar.
61. How do glow-worms produce light?
A) By reflecting sunlight
B) By bioluminescence
C) By using heat energy
D) By absorbing moonlight
Answer: B) By bioluminescence
Explanation: Glow-worms produce light through a chemical reaction involving luciferase, which helps them attract mates and communicate.
62. What special ability helps bats find food in total darkness?
A) High-frequency hearing
B) Infrared vision
C) Echolocation
D) Magnetic field detection
Answer: C) Echolocation
Explanation: Bats emit high-pitched sound waves that bounce off objects, helping them navigate and locate food in the dark.
63. How do crickets produce their characteristic chirping sound?
A) By rubbing their wings together
B) By clicking their jaws
C) By vibrating their legs
D) By striking leaves
Answer: A) By rubbing their wings together
Explanation: Male crickets create chirping sounds by rubbing their wings together, a process called stridulation, to attract mates.
64. What helps vultures locate dead animals from high in the sky?
A) Their sense of hearing
B) Their keen eyesight
C) Their strong sense of smell
D) Their ability to detect body heat
Answer: C) Their strong sense of smell
Explanation: Vultures have an extraordinary sense of smell that allows them to detect the gases released by decaying animals from great distances.
65. Why do rabbits thump their hind legs?
A) To mark their territory
B) To warn other rabbits of danger
C) To balance their body while running
D) To attract mates
Answer: B) To warn other rabbits of danger
Explanation: Rabbits thump their strong hind legs against the ground to alert other rabbits in their group about potential threats.
66. How do tigers mark their territory?
A) By roaring loudly
B) By scratching trees
C) By spraying scent markings
D) By digging holes
Answer: C) By spraying scent markings
Explanation: Tigers use scent markings by spraying urine and gland secretions to establish their territory and warn other tigers.
67. Why do deer freeze when they sense danger?
A) To confuse predators
B) To hide their scent
C) To listen for threats
D) To conserve energy
Answer: C) To listen for threats
Explanation: Deer stop moving and remain still to carefully listen for potential threats before deciding whether to flee.
68. What helps pigeons recognize landmarks during flight?
A) Their sharp memory
B) Their ability to sense wind patterns
C) Their sensitive feet
D) Their ultraviolet vision
Answer: A) Their sharp memory
Explanation: Pigeons have excellent memory and can recognize familiar landmarks to navigate back to their nests.
69. Why do fish have taste buds on their bodies?
A) To detect predators
B) To sense the chemical composition of water
C) To communicate with other fish
D) To find mates
Answer: B) To sense the chemical composition of water
Explanation: Many fish have taste buds on their skin and fins, which help them detect food and chemicals in the water.
70. How do camels sense underground water sources?
A) By smelling moisture in the air
B) By detecting vibrations in the sand
C) By following other animals
D) By listening for water movement
Answer: A) By smelling moisture in the air
Explanation: Camels have an acute sense of smell that allows them to detect moisture in the air and locate water sources underground.
71. How do starfish detect light and dark?
A) Through their central mouth
B) Using their tube feet
C) Through eyespots on their arms
D) By sensing vibrations in the water
Answer: C) Through eyespots on their arms
Explanation: Starfish have simple eyespots at the tips of their arms that help them distinguish between light and dark.
72. Why do kangaroos use their tails while walking?
A) To balance their body
B) To scare away predators
C) To communicate with other kangaroos
D) To detect ground vibrations
Answer: A) To balance their body
Explanation: Kangaroos use their tails as a third limb to support their weight and maintain balance while walking or hopping.
73. How do ants recognize members of their own colony?
A) By their body size
B) By their unique scent
C) By the color of their exoskeleton
D) By their movement patterns
Answer: B) By their unique scent
Explanation: Ants use pheromones (chemical signals) to recognize members of their own colony and differentiate them from outsiders.
74. What helps whales communicate over long distances?
A) Their sharp eyesight
B) Infrared sensing
C) Low-frequency sound waves
D) Their strong sense of smell
Answer: C) Low-frequency sound waves
Explanation: Whales use low-frequency sounds, known as whale songs, which can travel thousands of kilometers underwater to communicate with other whales.
75. Why do fire ants bite and sting?
A) To gather food
B) To protect their colony
C) To find mates
D) To regulate body temperature
Answer: B) To protect their colony
Explanation: Fire ants use their strong jaws to bite and inject venom through their stingers as a defense mechanism against threats.
76. How do dolphins detect objects underwater?
A) By using sonar (echolocation)
B) By sensing water temperature
C) By detecting magnetic fields
D) By using their sharp eyesight
Answer: A) By using sonar (echolocation)
Explanation: Dolphins produce sound waves that bounce off objects and return as echoes, helping them detect prey and obstacles underwater.
77. What special sense helps butterflies find nectar?
A) Their ultraviolet vision
B) Their ability to sense heat
C) Their long antennae
D) Their sharp hearing
Answer: A) Their ultraviolet vision
Explanation: Butterflies can see ultraviolet light, which helps them locate flowers rich in nectar, as many flowers have UV-reflecting patterns.
78. Why do polar bears have a strong sense of smell?
A) To detect underwater currents
B) To find mates
C) To locate seals from long distances
D) To sense approaching storms
Answer: C) To locate seals from long distances
Explanation: Polar bears have an excellent sense of smell that allows them to detect seals beneath thick layers of ice from several kilometers away.
79. How do woodpeckers avoid brain injuries while pecking?
A) By pecking slowly
B) By having a specialized skull structure
C) By using their tongue to cushion impact
D) By flapping their wings for balance
Answer: B) By having a specialized skull structure
Explanation: Woodpeckers have a shock-absorbing skull that prevents brain damage while pecking at high speeds.
80. Why do scorpions glow under ultraviolet light?
A) To warn predators
B) Due to a chemical in their exoskeleton
C) To find food
D) To communicate with other scorpions
Answer: B) Due to a chemical in their exoskeleton
Explanation: Scorpions contain fluorescent chemicals in their exoskeleton that make them glow under UV light, though the exact purpose of this trait is still being studied.
81. How do moths navigate at night?
A) By following the Earth’s magnetic field
B) By sensing air pressure
C) By using the moon and stars as reference points
D) By detecting heat from objects
Answer: C) By using the moon and stars as reference points
Explanation: Moths use the natural light of the moon and stars for navigation, but artificial lights can confuse them, causing them to spiral toward them.
82. Why do owls have a flat face?
A) To improve their sense of smell
B) To make them more aerodynamic
C) To help funnel sound to their ears
D) To protect their eyes from dust
Answer: C) To help funnel sound to their ears
Explanation: The flat facial disk of owls helps direct sound waves to their ears, improving their ability to detect prey even in complete darkness.
83. How do jellyfish sense their surroundings?
A) By using their tentacles
B) By detecting electric fields
C) Through specialized nerve cells and light-sensitive organs
D) By producing sound waves
Answer: C) Through specialized nerve cells and light-sensitive organs
Explanation: Jellyfish have nerve nets and simple light-sensitive organs (ocelli) that help them detect light and movement in the water.
84. How do snakes hear without external ears?
A) By detecting sound waves through their skin
B) By sensing vibrations in the ground through their jawbones
C) By using their tongue to sense sound
D) By detecting infrared radiation
Answer: B) By sensing vibrations in the ground through their jawbones
Explanation: Snakes lack external ears but can detect vibrations in the ground through their jawbones, which are connected to their inner ears.
85. How do elephants communicate over long distances?
A) Through high-pitched calls
B) By using infrasound (low-frequency sound waves)
C) By stamping the ground
D) By flapping their ears
Answer: B) By using infrasound (low-frequency sound waves)
Explanation: Elephants produce low-frequency infrasound that can travel long distances, allowing them to communicate with other elephants far away.
86. Why do lizards drop their tails when threatened?
A) To distract predators
B) To release toxins
C) To escape through small spaces
D) To grow a stronger tail
Answer: A) To distract predators
Explanation: Some lizards can detach their tails, which continue to move, distracting predators while they escape. The tail later regenerates.
87. How do bees detect the best flowers for nectar?
A) By sensing electromagnetic waves
B) By seeing ultraviolet patterns on flowers
C) By detecting air pressure changes
D) By tasting the air with their wings
Answer: B) By seeing ultraviolet patterns on flowers
Explanation: Many flowers have ultraviolet (UV) markings that are invisible to humans but guide bees to nectar-rich areas.
88. How do chameleons catch their prey?
A) By sneaking up silently
B) By using their long sticky tongue
C) By releasing a paralyzing toxin
D) By waiting for the prey to approach
Answer: B) By using their long sticky tongue
Explanation: Chameleons have long, sticky tongues that shoot out rapidly to capture insects and other small prey.
89. What sense do fish use to detect predators in murky water?
A) Their lateral line system
B) Their sharp eyesight
C) Their ability to sense infrared light
D) Their excellent hearing
Answer: A) Their lateral line system
Explanation: The lateral line system allows fish to detect vibrations and movements in the water, helping them sense predators and other objects.
90. How do leafcutter ants find their way back to their nest?
A) By remembering the landscape
B) By leaving chemical trails
C) By detecting the Earth’s magnetic field
D) By communicating through sounds
Answer: B) By leaving chemical trails
Explanation: Leafcutter ants use pheromones (chemical trails) to mark their paths, allowing other ants to follow them back to the nest.
91. How do tarantulas detect their prey?
A) By sensing body heat
B) By detecting vibrations in the ground
C) By seeing in ultraviolet light
D) By using their web
Answer: B) By detecting vibrations in the ground
Explanation: Tarantulas have fine sensory hairs on their legs that help them detect vibrations in the ground, allowing them to sense nearby prey.
92. Why do deer have large, sensitive ears?
A) To hear approaching predators
B) To cool their body
C) To locate water sources
D) To help them run faster
Answer: A) To hear approaching predators
Explanation: Deer have large ears that can rotate to detect sounds from different directions, helping them remain alert to predators.
93. How do sea cucumbers defend themselves?
A) By releasing toxins
B) By changing color
C) By expelling their internal organs
D) By playing dead
Answer: C) By expelling their internal organs
Explanation: When threatened, sea cucumbers eject parts of their internal organs to startle predators and later regenerate the lost body parts.
94. How do termites communicate within their colonies?
A) By making clicking sounds
B) By releasing pheromones
C) By flashing bioluminescent signals
D) By vibrating their wings
Answer: B) By releasing pheromones
Explanation: Termites use chemical signals called pheromones to communicate with each other and organize tasks within their colony.
95. What special sense helps platypuses find food in murky water?
A) Their highly sensitive eyesight
B) Their ability to detect electric fields
C) Their strong sense of smell
D) Their ability to sense vibrations in water
Answer: B) Their ability to detect electric fields
Explanation: Platypuses have electroreceptors in their bills that allow them to detect the weak electric fields produced by prey in water.
96. Why do snakes shed their skin?
A) To grow larger
B) To remove parasites
C) To improve their camouflage
D) All of the above
Answer: D) All of the above
Explanation: Snakes shed their skin to accommodate growth, remove parasites, and sometimes change appearance for better camouflage.
97. How do bats locate tiny insects in the dark?
A) By detecting body heat
B) By seeing in the dark
C) By using echolocation
D) By following scent trails
Answer: C) By using echolocation
Explanation: Bats emit high-frequency sound waves and listen for the returning echoes to locate insects in complete darkness.
98. What helps geckos climb vertical surfaces?
A) Their sticky feet pads
B) Their strong claws
C) Their lightweight bodies
D) Their ability to generate suction
Answer: A) Their sticky feet pads
Explanation: Geckos have specialized toe pads with microscopic hairs called setae that create molecular attraction, allowing them to stick to surfaces.
99. Why do dolphins jump out of the water?
A) To breathe better
B) To remove parasites
C) To communicate with other dolphins
D) All of the above
Answer: D) All of the above
Explanation: Dolphins leap out of the water to breathe more efficiently, shake off parasites, and signal to other dolphins in their pod.
100. How do cockroaches detect danger quickly?
A) By sensing vibrations through their legs
B) By using their long antennae
C) By detecting air movements with tiny hairs
D) All of the above
Answer: D) All of the above
Explanation: Cockroaches have highly sensitive antennae and hairs on their bodies that allow them to detect vibrations, air movements, and potential threats instantly.
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