Frog – Morphology: NEET MCQs with Answers

15 free questions on Frog – Morphology for NEET (UG), starting with previous-year NEET and AIPMT questions. Try each one, then tap Show answer for the answer and a short explanation.

Syllabus covered: Morphology, anatomy and functions of different systems (digestive, circulatory, respiratory, nervous and reproductive) (Brief account only)

Practise all 196 Frog – Morphology questions free Take a free timed test

Question 1

Previous-year question
A frog's heart, when taken out of the body, continues to beat for some time. Select the best option from the following statements. (A) The frog is a poikilotherm. (B) The frog does not have any coronary circulation. (C) The heart is myogenic in nature. (D) The heart is autoexcitable. [NEET 2017]
  1. Only (D)
  2. (A) and (B)
  3. (C) and (D)
  4. Only (C)
Show answer
Answer: (C) (C) and (D)
Explanation: The excised heart keeps beating because the impulse originates within the cardiac muscle itself - the heart is myogenic and therefore autoexcitable, needing no external nerve supply to initiate a beat.

Question 2

Previous-year question
Mucus helps the frog in maintaining [AIPMT 1993]
  1. Thick skin
  2. Dry skin
  3. Smooth skin
  4. Moist skin
Show answer
Answer: (D) Moist skin
Explanation: The mucous glands of the frog's skin secrete mucus that keeps the skin moist and slippery. A moist skin is essential for cutaneous respiration, which is the frog's only means of gaseous exchange during hibernation and aestivation, when the lungs are not used.

Question 3

Previous-year question
In the frog, the surface of attachment of the tongue is the [AIPMT 1997]
  1. Sphenoid
  2. Palatine
  3. Pterygoid
  4. Hyoid apparatus
Show answer
Answer: (D) Hyoid apparatus
Explanation: The main part of the hyoid apparatus is a broad, flat and squarish plate, also called the basilingual plate, which lies in the floor of the buccal cavity. It provides attachment and support to the tongue, which in the frog is bilobed and can be flicked out to capture prey.

Question 4

Previous-year question
Compared with those of humans, the erythrocytes of a frog are [AIPMT 2012]
  1. Without nucleus but with haemoglobin
  2. Nucleated and with haemoglobin
  3. Very much smaller and fewer
  4. Nucleated and without haemoglobin
Show answer
Answer: (B) Nucleated and with haemoglobin
Explanation: Human erythrocytes are enucleate and biconcave discs, whereas those of the frog are large, oval, biconvex and nucleated. Frog erythrocytes nevertheless contain haemoglobin and act as the carriers of oxygen in the blood.

Question 5

Previous-year question
A frog's heart, when taken out of the body, continues to beat for some time. Select the best option from the following statements. I. Frog is a poikilotherm. II. Frog does not have any coronary circulation. III. Heart is myogenic in nature. IV. Heart is autoexcitable. [NEET 2017]
  1. Only III
  2. Only IV
  3. I and II
  4. III and IV
Show answer
Answer: (D) III and IV
Explanation: The frog's heart is myogenic and auto-excitable: its beat originates in the cardiac muscle itself (the pacemaker tissue), not from nerves, so an isolated heart keeps beating for some time. Being poikilothermic or lacking coronary circulation does not explain this.

Question 6

Previous-year question
Select the correct route for the passage of sperms in male frogs. [NEET 2017]
  1. Testes → Bidder's canal → Kidney → Vasa efferentia → Urinogenital duct → Cloaca
  2. Testes → Vasa efferentia → Kidney → Seminal vesicle → Urinogenital duct → Cloaca
  3. Testes → Vasa efferentia → Bidder's canal → Ureter → Cloaca
  4. Testes → Vasa efferentia → Kidney → Bidder's canal → Urinogenital duct → Cloaca
Show answer
Answer: (D) Testes → Vasa efferentia → Kidney → Bidder's canal → Urinogenital duct → Cloaca
Explanation: In male frogs the germinal epithelium of the seminiferous tubules produces sperms, which are carried to the kidney through the vasa efferentia. From the kidney they enter Bidder's canal, then pass through the transverse and longitudinal collecting tubules into the urinogenital duct, which carries them to the seminal vesicle for temporary storage and finally to the cloaca.

Question 7

Previous-year question
Frogs differ from humans in possessing [2011]
  1. nucleated red blood cells
  2. paired cerebral hemispheres
  3. a thyroid as well as a parathyroid
  4. a hepatic portal system
Show answer
Answer: (A) nucleated red blood cells
Explanation: The erythrocytes of the frog, like those of all other vertebrates except mammals, are oval and retain their nucleus throughout life. Mature human red cells extrude the nucleus, which increases the space available for haemoglobin. Paired cerebral hemispheres, both thyroid and parathyroid glands, and a hepatic portal system are common to both animals.
Doing well? Create a free account to take timed tests on this topic and see your weak areas.

Question 8

Previous-year question
Mucus helps the frog to maintain a [1993]
  1. smooth skin
  2. thick skin
  3. moist skin
  4. dry skin
Show answer
Answer: (C) moist skin
Explanation: The mucous glands of the frog's skin keep the surface continuously moist and slippery. This is essential because a large part of the animal's gaseous exchange takes place through the skin, and oxygen can diffuse across it only after dissolving in the surface film of moisture.

Question 9

Previous-year question
Compared to those of humans, the erythrocytes of a frog are [AIPMT Pre 2012]
  1. Without a nucleus but with haemoglobin
  2. Nucleated and with haemoglobin
  3. Very much smaller and fewer
  4. Nucleated and without haemoglobin
Show answer
Answer: (B) Nucleated and with haemoglobin
Explanation: Frog RBCs are nucleated and contain haemoglobin (human RBCs lack a nucleus).

Question 10

Previous-year question
Which characteristic is common to both humans and adult frogs? [AIPMT Mains 2012]
  1. Internal fertilisation
  2. Nucleated RBCs
  3. Ureotelic mode of excretion
  4. Four-chambered heart
Show answer
Answer: (C) Ureotelic mode of excretion
Explanation: Both humans and adult frogs are ureotelic (excrete urea).

Question 11

Previous-year question
Ureters act as urinogenital ducts in [AIPMT Mains 2011]
  1. Human males
  2. Human females
  3. Both male and female frogs
  4. Male frogs
Show answer
Answer: (D) Male frogs
Explanation: In male frogs the ureter carries both urine and sperm (urinogenital duct).

Question 12

Previous-year question
For Rana tigrina, mark True/False: (A) on dry land it would die of lack of O₂ if its mouth were kept closed for a few days (B) it has a four-chambered heart (C) on dry land it turns uricotelic from ureotelic (D) its life history is carried out in pond water. [AIPMT Mains 2011]
  1. T F F T
  2. T T F F
  3. F F T T
  4. F T T F
Show answer
Answer: (A) T F F T
Explanation: A–T (buccal/cutaneous breathing needs an open mouth), B–F (the frog heart is three-chambered), C–F (it remains ureotelic), D–T → T F F T.

Question 13

Previous-year question
Select the correct route for passage of sperms in male frogs: [NEET, 2017]
  1. Testes → Vasa efferentia → Kidney → Seminal Vesicle → Urinogenital duct → Cloaca
  2. Testes → Vasa efferentia → Bidder's canal → Ureter → Cloaca
  3. Testes → Vasa efferentia → Kidney → Bidder's canal → Urinogenital duct → Cloaca
  4. Testes → Bidder's canal → Kidney → Vasa efferentia → Urinogenital duct → Cloaca
Show answer
Answer: (C) Testes → Vasa efferentia → Kidney → Bidder's canal → Urinogenital duct → Cloaca
Explanation: Sperm route in male frog: Testes → Vasa efferentia → Kidney → Bidder's canal → Urinogenital duct → Cloaca.

Question 14

Previous-year question
Frog's heart taken out of body continues to beat for some time. Select the best option: (a) Frog is a poikilotherm. (b) Frog has no coronary circulation. (c) Heart is 'myogenic' in nature. (d) Heart is autoexcitable. [NEET, 2017]
  1. Only (d)
  2. (a) and (b)
  3. (c) and (d)
  4. Only (c)
Show answer
Answer: (C) (c) and (d)
Explanation: The isolated frog heart keeps beating because it is myogenic and autoexcitable — statements (c) and (d).

Question 15

A frog dives into a pond. Which structure protects its eyes under water, and which structure on either side of the eyes receives sound signals?
  1. Vocal sac; tympanum
  2. Copulatory pad; nictitating membrane
  3. Nictitating membrane; vocal sac
  4. Nictitating membrane; tympanum
Show answer
Answer: (D) Nictitating membrane; tympanum
Explanation: The bulged eyes of the frog are covered by a nictitating membrane that protects them while it is in water. A membranous tympanum on either side of the eyes acts as the ear and receives sound signals. Vocal sacs produce sound in males, and the copulatory pad is a male feature on the first digit of the forelimb.

Want more Frog – Morphology questions?

E-GYAN NIDHI has 196 questions on this topic and 63,000+ in total, all free: timed CBT tests, NEET marking and instant analysis.

Register free Free Sunday Mock Test

More topics in Structural Organisation in Animals and Plants

↑