Q.1 Which is the largest animal on Earth?
African Elephant
Blue Whale
Giraffe
Whale Shark
Explanation - The blue whale is the largest animal to ever live on Earth, even larger than any known dinosaur.
Correct answer is: Blue Whale
Q.2 What is the main function of gills in fish?
To filter food
To help in swimming
To exchange gases
To sense danger
Explanation - Gills allow fish to extract oxygen from water and expel carbon dioxide, functioning like lungs in land animals.
Correct answer is: To exchange gases
Q.3 Which class of animals do frogs belong to?
Amphibia
Reptilia
Mammalia
Aves
Explanation - Frogs belong to class Amphibia because they can live both in water and on land during their life cycle.
Correct answer is: Amphibia
Q.4 Which organ is primarily responsible for excretion in humans?
Liver
Lungs
Kidneys
Skin
Explanation - The kidneys filter waste products like urea and excess salts from the blood, forming urine.
Correct answer is: Kidneys
Q.5 What type of symmetry is shown by starfish?
Bilateral
Radial
Asymmetrical
Spherical
Explanation - Starfish exhibit radial symmetry, meaning their body parts are arranged around a central axis.
Correct answer is: Radial
Q.6 Which of the following is a mammal?
Penguin
Bat
Shark
Crocodile
Explanation - Bats are the only flying mammals; they give birth to young ones and feed them with milk.
Correct answer is: Bat
Q.7 Which group of animals is characterized by a notochord?
Arthropods
Chordates
Mollusks
Echinoderms
Explanation - All chordates possess a notochord at some stage of their development, which provides structural support.
Correct answer is: Chordates
Q.8 Which is the fastest land animal?
Horse
Cheetah
Leopard
Tiger
Explanation - The cheetah is the fastest land animal, capable of speeds up to 112 km/h in short bursts.
Correct answer is: Cheetah
Q.9 Birds are classified under which class?
Mammalia
Aves
Reptilia
Amphibia
Explanation - Birds belong to class Aves, characterized by feathers, beaks, and laying hard-shelled eggs.
Correct answer is: Aves
Q.10 Insects have how many pairs of legs?
2
3
4
5
Explanation - Insects have three pairs of legs, making a total of six legs, which is a defining feature.
Correct answer is: 3
Q.11 Which part of the human brain controls balance and posture?
Cerebrum
Cerebellum
Medulla
Thalamus
Explanation - The cerebellum is responsible for coordinating movement, balance, and posture in the body.
Correct answer is: Cerebellum
Q.12 Which is the largest living bird?
Eagle
Ostrich
Albatross
Emu
Explanation - The ostrich is the largest living bird and cannot fly but can run at high speeds.
Correct answer is: Ostrich
Q.13 Which blood cells in humans are responsible for fighting infections?
Red blood cells
White blood cells
Platelets
Plasma
Explanation - White blood cells (leukocytes) are part of the immune system and protect the body from infections.
Correct answer is: White blood cells
Q.14 Which organ helps birds to grind food since they lack teeth?
Crop
Gizzard
Stomach
Cloaca
Explanation - Birds use their muscular gizzard to grind food, often with the help of ingested stones.
Correct answer is: Gizzard
Q.15 What is the scientific study of insects called?
Ornithology
Entomology
Herpetology
Ichthyology
Explanation - Entomology is the branch of zoology dealing with the study of insects.
Correct answer is: Entomology
Q.16 Which type of reproduction involves only one parent?
Sexual reproduction
Asexual reproduction
Cross-fertilization
Hybridization
Explanation - In asexual reproduction, a single parent produces offspring without the fusion of gametes.
Correct answer is: Asexual reproduction
Q.17 Which reptile is known as a living fossil?
Iguana
Komodo dragon
Tuatara
Chameleon
Explanation - The tuatara, found in New Zealand, resembles ancient reptiles and has changed little over millions of years.
Correct answer is: Tuatara
Q.18 Which animal is known as the 'ship of the desert'?
Horse
Camel
Donkey
Elephant
Explanation - Camels are called 'ship of the desert' because they are adapted to survive and travel long distances in deserts.
Correct answer is: Camel
Q.19 Which fish is known for its ability to produce electricity?
Shark
Eel
Electric ray
Salmon
Explanation - Electric rays can generate electric shocks to stun prey and defend themselves.
Correct answer is: Electric ray
Q.20 What is the primary mode of respiration in earthworms?
Gills
Lungs
Skin
Trachea
Explanation - Earthworms breathe through their moist skin, which allows for gas exchange.
Correct answer is: Skin
Q.21 Which mammal lays eggs?
Kangaroo
Platypus
Whale
Tiger
Explanation - The platypus is a monotreme, a unique group of mammals that lay eggs instead of giving birth to live young.
Correct answer is: Platypus
Q.22 Which structure is used by Amoeba for locomotion?
Cilia
Flagella
Pseudopodia
Setae
Explanation - Amoebas move by extending pseudopodia (false feet), which also help in engulfing food.
Correct answer is: Pseudopodia
Q.23 Which gas is exhaled by animals during respiration?
Oxygen
Nitrogen
Carbon dioxide
Hydrogen
Explanation - During respiration, animals inhale oxygen for energy production and exhale carbon dioxide as a waste product.
Correct answer is: Carbon dioxide
Q.24 Which organ system in humans is responsible for transporting nutrients and oxygen?
Respiratory system
Circulatory system
Digestive system
Nervous system
Explanation - The circulatory system transports oxygen, nutrients, hormones, and waste products throughout the body.
Correct answer is: Circulatory system
Q.25 Which animal has the longest gestation period?
Giraffe
Blue Whale
Elephant
Horse
Explanation - Elephants have the longest gestation period, lasting about 22 months before giving birth.
Correct answer is: Elephant