External Morphology of Frog Practice Questions
20 free External Morphology of Frog practice questions for the NCERT Biology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
The body of a frog is divided into how many main regions?
- A 2
- B 3
- C 4
- D 5
Correct answer: 2
The frog body is divided into head and trunk. It lacks a distinct neck and tail in the adult stage.
Which structure is absent in adult frogs?
- A Head
- B Limbs
- C Eyes
- D Tail
Correct answer: Tail
Adult frogs do not have a tail. The tail is present only in the larval stage (tadpole).
Frog belongs to which class of vertebrates?
- A Pisces
- B Reptilia
- C Amphibia
- D Mammalia
Correct answer: Amphibia
Frogs are amphibians. They can live both in water and on land.
The skin of frog is:
- A Dry and scaly
- B Hard, dry, and chitinous
- C Moist and glandular
- D Hairy
Correct answer: Moist and glandular
Frog skin is moist and contains mucus glands. It helps in respiration and prevents drying.
Which structure in frogs is used for hearing?
- A Tympanum
- B Nostrils
- C Eyes
- D Tongue
Correct answer: Tympanum
The tympanum is a membrane behind the eye. It functions as an external ear for hearing.
How many pairs of limbs are present in frogs?
- A Two
- B One
- C Three
- D Four
Correct answer: Two
Frogs have two pairs of limbs: forelimbs and hindlimbs. These are used for movement.
Which limbs of frog are adapted for jumping and swimming?
- A Hindlimbs
- B Forelimbs
- C Both equally
- D None
Correct answer: Hindlimbs
Hindlimbs are longer and stronger. They are adapted for jumping and swimming.
What is the function of webbed toes in frogs?
- A Digging
- B Climbing
- C Swimming
- D Grasping
Correct answer: Swimming
Webbed toes increase surface area. They help frogs swim efficiently in water.
Which organ allows a frog to carry out cutaneous respiration?
- A Lungs
- B Gills
- C Moist skin
- D Tracheal tube
Correct answer: Moist skin
Frogs can respire through their moist skin. This is called cutaneous respiration.
Which structure allows frogs to breathe when partially submerged in water?
- A Nostrils
- B Eyes
- C Tongue
- D Ear openings
Correct answer: Nostrils
External nostrils allow frogs to breathe air. They remain above water when the body is submerged.
Which type of symmetry is shown by frogs?
- A Bilateral symmetry
- B Radial symmetry
- C Asymmetry
- D Spherical symmetry
Correct answer: Bilateral symmetry
Frogs show bilateral symmetry. Their body can be divided into two equal halves along one plane.
Which structure in frog helps in catching prey?
- A Teeth
- B Tongue
- C Long legs
- D Eyes
Correct answer: Tongue
The frog's tongue is long, sticky, and protrusible. It helps in capturing insects quickly.
Where are the eyes of frog located?
- A On sides of head
- B On dorsal side
- C On ventral side
- D Inside mouth
Correct answer: On dorsal side
Frog eyes are located on the dorsal side of the head. This helps them see while partially submerged.
Which structure protects frog's eyes in water?
- A Outer protective eyelid
- B Nictitating membrane
- C Cornea
- D Lens
Correct answer: Nictitating membrane
The nictitating membrane is a transparent eyelid. It protects the eyes during swimming.
Which type of locomotion is NOT shown by frogs?
- A Jumping
- B Diving
- C Crawling
- D Flying
Correct answer: Flying
Frogs cannot fly. They mainly move by jumping and swimming.
Which opening is common for digestive, excretory, and reproductive systems in frogs?
- A Mouth
- B Anus
- C Cloaca
- D Nostrils
Correct answer: Cloaca
The cloaca is a common opening for multiple systems. It is located at the posterior end.
Which feature helps frog blend with its surroundings?
- A Bright color
- B Camouflage
- C Large size
- D Strong limbs
Correct answer: Camouflage
Frogs exhibit camouflage. Their skin color helps them blend into their environment.
Which structure is absent in frog forelimbs compared to hindlimbs?
- A Digits
- B Webbing
- C Joints
- D Muscles
Correct answer: Webbing
Forelimbs lack webbing. Hindlimbs have webbed toes for swimming.
Which organ is responsible for vision in frogs?
- A Tympanum
- B Eyes
- C Nostrils
- D Skin
Correct answer: Eyes
Eyes are well-developed in frogs. They provide a wide field of vision.
Which feature of frog skin helps in respiration?
- A Dry surface
- B Protective scales
- C Mucus secretion
- D Hair
Correct answer: Mucus secretion
Mucus keeps the skin moist. This is essential for cutaneous respiration.