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Structural Organisation in Animals
Frog
4 questions from 2 papers, each with its answer.
- questions
- 4
- papers
- 2
- of Structural Organisation in Animals
- 4.35%
Appears in
Concepts tested
- Blood of frog
- RBCs of frog
- Respiration, heart and excretion of frog
- Urinogenital system of frog
All Questions
2012 AIPMT-PRE 1 question
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Compared to those of humans, the erythrocytes in frog areIn frog the RBCs are nucleated and contain the red respiratory pigment haemoglobin.
In humans and most mammals the mature RBCs lack a nucleus.
2011 AIPMT-MAINS 3 questions
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Ureters act as urinogenital ducts inIn the male frog, the vasa efferentia from the testis enter the kidney and open into Bidder's canal, which finally communicates with the ureter.
So the ureter of the male frog carries both urine and sperms; it acts as a urinogenital duct and opens into the cloaca.
In the female frog the ureters and the oviducts open separately into the cloaca, so the ureters carry only urine.
In humans the ureters carry only urine from the kidney to the urinary bladder in both sexes; in human males it is the urethra that is the common urinogenital passage.
Hence ureters act as urinogenital ducts in male frogs. -
Frogs differ from humans in possessingThe RBCs of the frog are nucleated and contain haemoglobin.
Mature human RBCs are biconcave and lack a nucleus.
Thyroid and parathyroid glands, paired cerebral hemispheres and a hepatic portal system are present in both frogs and humans.
(The frog additionally has a renal portal system, which humans lack, but that is not among the choices.)
Hence frogs differ from humans in possessing nucleated red blood cells. -
Consider the following four statements (A–D) related to the common frog $Rana\ tigrina$, and select the correct option stating which ones are true (T) and which ones are false (F).
Statements:
(A) On dry land it would die due to lack of $O_2$ if its mouth is forcibly kept closed for a few days.
(B) It has four chambered heart.
(C) On dry land it turns uricotelic from ureotelic.
(D) Its life history is carried out in pond water.(A) is false: the frog does not breathe through its open mouth. On land it respires through the skin (cutaneous), the buccal cavity and the lungs, drawing air in through the nostrils with the mouth kept closed. Keeping the mouth closed therefore does not cut off its oxygen.
(B) is false: the frog's heart is three-chambered, with two atria and one ventricle.
(D) is true: fertilisation is external in water, and the eggs and the tadpole larvae develop in pond water before metamorphosis.
(C): the frog is a ureotelic animal. The answer key of the source treats this statement as true, giving the combination F, F, T, T.
So the option accepted in the key is (A) F, (B) F, (C) T, (D) T.
Note: by NCERT the adult frog stays ureotelic on land, so statement (C) is doubtful and none of the four options fits perfectly; some books give T, F, F, T instead. The key of the source PDF is retained.