🐸 FROG - NEET 2027 Complete Question Bank

Class 12 | Structural Organisation in Animals

Basic se Advance tak | 50+ Questions

📌 SYLLABUS NOTE (NEET 2027)

• Frog ke Morphology, Anatomy aur functions (Digestive, Circulatory, Respiratory, Nervous, Reproductive - brief account) syllabus mein hain
• Earthworm aur Cockroach NEET 2027 syllabus se HATA diye gaye hain
• Frog se approximately 2-3 questions (8-12 marks) expected hain

🟢 LEVEL 1 - BASIC (Morphology / External Features)

Ans: Rana tigrina

Ans: Sirf Head aur Trunk (No neck, no tail in adult)

Ans: Smooth, moist, glandular - cutaneous respiration ke liye

Ans: Nictitating membrane - eyes ko protect karti hai

Ans: Nahi - lower jaw edentulous (teeth-less) hoti hai

Ans: Maxillary teeth (upper jaw) + Vomerine teeth (palate mein)

Ans: Male mein vocal sacs hote hain (female mein nahi) (PYQ 2026 Cancelled exam: Vocal sacs)

Ans: Jumping aur swimming ke liye adaptation

Ans: Phylum Chordata, Class Amphibia

Ans: Webbed feet (swimming ke liye)

🟡 LEVEL 2 - MODERATE (Internal Anatomy - Organ Systems)

🫀 Circulatory System

Ans: 3 chambered - 2 Auricles (atria) + 1 Ventricle

Ans: Conus arteriosus (truncus arteriosus)

Ans: Myogenic heart hai - contractions muscle se originate hoti hain (sinoauricular node), nervous system se independent

Ans: Nahi - frog mein coronary circulation absent hai (PYQ)

Ans: Nucleated RBCs (mammals mein enucleated hote hain - yeh difference important hai)

Ans: Immune responses / antibody production

Ans: Spiral valve in conus arteriosus - blood ko alag-alag rakhta hai

🫁 Respiratory System

Ans: 3 types:

1. Cutaneous (through moist skin)
2. Buccal/Pulmonary (through lungs - on land)
3. Branchial (through gills - larval stage/tadpole)

Ans: Winter hibernation mein (jab soil/mud mein daba rehta hai)

Ans: Sac-like, simple pouches - alveoli ka well-developed network

Ans: Gills se (branchial respiration)

🍽️ Digestive System

Ans: Bilobed tongue se - tongue floor of mouth se attached hoti hai, tip free hoti hai (insects pakadne ke liye flip hoti hai)

Ans: Liver, Pancreas (hepatopancreas region)

Ans: Gastric glands secrete HCl aur pepsin

Ans: Gall bladder mein

Ans: Digestive, excretory aur reproductive systems ka common opening (eggs, waste, urine sab cloaca se bahar aata hai)

🧠 Nervous System

Ans: 3 parts:

1. Forebrain (Cerebrum + Diencephalon)
2. Midbrain (2 optic lobes)
3. Hindbrain (Cerebellum + Medulla oblongata)

Ans: 10 pairs (mammals mein 12 pairs hote hain)

Ans: 10 pairs

Ans: Balance aur complex movements zyada nahi hote (simple locomotion)

🔬 Excretory System

Ans: Ureotelic - urea excrete karta hai (aquatic hone ke bawajood, adult frog urea excrete karta hai; tadpole ammonotelic hota hai)

Ans: Mesonephric kidneys (mesonephros type)

Ans: Sperms ko kidney se cloaca tak le jaata hai (urogenital duct)

🔁 Reproductive System

Ans: External fertilization - water mein

Ans: Water mein - eggs jelly-like coating se covered hote hain

Ans: Kidneys ke anterior end ke paas, fat bodies ke attached

Ans: Kidneys ke paas, paired structure

Ans: Indirect development - tadpole larva se metamorphosis hoti hai adult mein

🔴 LEVEL 3 - ADVANCE (Application / Tricky / Conceptual)

Ans: Body temperature environment ke saath change hoti hai - isliye frog hibernation (winter) aur aestivation (summer) karta hai

Ans:

• Deoxygenated: Right atrium (systemic circulation se)
• Oxygenated: Left atrium (pulmonary veins se lungs se)
• Dono single ventricle mein mix hote hain (partially)

Ans: Both A and R are true, R is correct explanation of A - moist skin mein gas dissolve ho sakta hai (O₂ in, CO₂ out)

Ans: Male frog mein vestigial ovary - testes ke anterior end mein present, reproductive disorder mein functional ho sakta hai

Ans: Cardiac muscle myogenic hoti hai - sino-auricular node (pacemaker) automatically depolarize hota hai without external nerve stimulus

Ans: Thyroid hormone (thyroxine) ke control mein - iodine deficiency se metamorphosis ruk jaati hai

Ans: Frog tongue ANTERIORLY attached hoti hai floor of mouth mein, tip POSTERIORLY free hota hai - prey pakadne ke liye rapidly flip hoti hai (ulti direction mein)

Ans: 10 pairs cranial nerves + 10 pairs spinal nerves + autonomic nervous system

Ans: Frog apni eyes retract kar sakta hai - food swallow karte waqt eyes andar dhakel ke food ko pharynx mein push karti hain

Ans: Bidder's canal / urogenital duct (male mein) - urine aur sperm dono isi se jaate hain

Ans: Frog (Order Anura) - no tail as adult; Salamander (Order Urodela) - tail present throughout life

Ans: TRUE - Chromatophores (melanophores) present hain - green/brown coloration for camouflage

📊 MOST ASKED NEET TOPICS FROM FROG (High Yield)

⚡ QUICK REVISION - MUST REMEMBER FACTS

1. Scientific name: Rana tigrina
2. Class: Amphibia | Phylum: Chordata
3. Heart: 3-chambered (2 atria + 1 ventricle) + Conus arteriosus
4. Respiration: Cutaneous + Pulmonary + Buccal
5. Cranial nerves: 10 pairs (mammals = 12)
6. Spinal nerves: 10 pairs
7. Excretion: Ureotelic (urea)
8. Kidney type: Mesonephric
9. Fertilization: External (in water)
10. Development: Indirect (tadpole → metamorphosis → adult frog)
11. Tongue: Anteriorly attached, tip free posteriorly
12. RBCs: Nucleated
13. No coronary circulation
14. Poikilothermic (cold-blooded)
15. Male feature: Vocal sacs (female mein absent)
16. Tadpole: Ammonotelic; Adult: Ureotelic
17. Metamorphosis: Thyroxine hormone se control hoti hai
18. Bidder's organ: Male mein vestigial ovary

Tip: NEET 2027 mein frog heart, respiration modes, cranial nerve count, aur external morphology se CONFIRM questions aate hain. Diagram-based questions ke liye frog ka digestive system aur heart diagram zaroor practice karo!