Quick Answer: Frog Charts are zoology wall charts illustrating the frog as the standard amphibian type study, with labelled diagrams of its external features, internal organ systems and life cycle. They are used in secondary and college biology.
The Frog as an Amphibian Model
The frog shows how one vertebrate lives both in water and on land, which is why it is a classic type study; the Indian bullfrog, Hoplobatrachus tigerinus (formerly Rana tigrina), is the usual textbook species. External diagrams label the head with bulging eyes, the nictitating membrane and the tympanum, the moist skin, short forelimbs and long webbed hind limbs, and the absence of a neck and tail in the adult.
Internal sheets typically show the digestive system (short oesophagus, stomach, coiled intestine, liver and gall bladder), a three-chambered heart with two atria and one ventricle, and the three routes of breathing: through the skin in water and during hibernation, and through the lining of the mouth and the lungs on land. Nervous, excretory and reproductive systems are usually drawn separately.
Younger classes use the life-cycle sheet most, from spawn to tadpole to froglet and adult, since metamorphosis can also be watched in a school aquarium in the monsoon.
Applications
- Teaching the amphibian type study without dissection
- Metamorphosis lessons alongside observing tadpoles
- Comparing three-chambered and four-chambered hearts across vertebrates
- Diagram practice for board examination questions
Specifications
| Organism | Frog (Indian bullfrog as the usual textbook species) |
| Typical diagrams | External features, digestive, circulatory, respiratory, nervous and urinogenital systems, life cycle |
| Level | Middle school (life cycle) to senior secondary and college (organ systems) |
| Use | Amphibian type study, comparative anatomy |
| Charts in the set and format | Confirm at enquiry |
Care & Handling
- Hang the frog charts in teaching order (external features, digestion, circulation, life cycle) so students move from one system to the next.
- Keep them away from aquarium tanks and specimen jars, as humidity and preservatives damage paper.
- Store them in a tube together with the cockroach sheets, since the two are often taught in the same term.
Why Choose LabEquip
Zoology departments usually order frog charts with the Cockroach Charts and the Fish Anatomy Chart. Send the class level and quantities through the LabEquip contact page.
Frequently Asked Questions
Why is the frog called an amphibian?
The word means “double life”. Frogs begin as aquatic tadpoles that breathe with gills and become adults that live mainly on land, breathing with lungs and skin, and return to water to breed.
How does a frog breathe?
In water and during hibernation it breathes through its moist skin (cutaneous respiration). On land it also breathes through the lining of the mouth (buccal respiration) and with its lungs (pulmonary respiration).
How is the frog’s heart different from a human heart?
A frog’s heart has three chambers, two atria and one ventricle, so some mixing of oxygenated and deoxygenated blood can occur. The human heart has four chambers and keeps the two completely separate.
What are the stages in the life cycle of a frog?
Eggs (spawn) hatch into tadpoles with gills and a tail. Hind legs and then forelegs develop, lungs replace gills and the tail is absorbed, giving a froglet and then the adult frog.
What is the nictitating membrane?
A thin, transparent third eyelid that moves across the eye to protect it and keep it moist, particularly while the frog is under water.
Can frog charts be used instead of dissection?
Yes, and in many schools and colleges they now are. Frog dissection has largely been dropped from practical work, and labelled charts, models and digital resources carry the anatomy teaching.
Last Updated: September 2026
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