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  • Structural Organisation in Plants and Animals
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  • Their body temperature varies with the temperature of the environment. Such animals are called cold blooded or poikilotherms.

  • They have the ability to change the colour 'to hide them from their enemies (camouflage). This protective coloration is called mimicry.

  • The frogs are not seen during peak summer and winter. During this period they take shelter in deep burrows to protect them from extreme' heat and cold. This is called as summer sleep (aestivation) and winter sleep (hibernation). 

  • The skin is smooth and slippery due to the presence of mucus. The skin is always maintained in a moist condition.

  • The colour of dorsal side of body is generally olive green with dark irregular spots. On the ventral side the skin is uniformly pale yellow.

  • The frog never drinks water but absorb it through the skin.

  • Body of a frog is divisible into head and trunk. A neck and tail are absent. Above the mouth, a pair of nostrils is present. Eyes are bulged and covered by a nictitating membrane that protects them while in water. On either side of eyes a membranous tympanum (ear) receives sound Signals. The forelimbs and hind limbs help in swimming, walking, leaping and burrowing. The hind limbs end in five digits and they are larger and muscular than fore limbs that end in four digits. Feet have webbed digits that help in swimming

  • Male frogs can be distinguished by the presence of sound producing vocal sacs and also a copulatory pad on the first digit of the fore which are absent in female frogs. 

Systematic position of Rana Tigrina:



Sub phylum

Vertebrata or Craniata




Salientia or Anura






  • The body cavity of frogs accommodates different organ systems such as digestive, circulatory, respiratory, nervous, excretory and reproductive systems with well developed structures and functions.

  • The digestive system consists of alimentary canal and digestive glands. The alimentary canal is short because frogs are carnivores and hence the length of intestine is reduced. The mouth opens into the buccal cavity that leads to the oesophagus through pharynx. 

  • Oesophagus is a short tube that opens into the stomach which in turn continues as 'the intestine, rectum and finally opens outside by the cloaca.

  • Liver secretes bile that is stored in the gall bladder. Pancreas, a digestive gland produces pancreatic juice containing digestive enzymes.

  • Food is captured by the bilobed tongue.

  • Digestion of food takes place by the action of HCI and gastric juices secreted from the walls of the stomach. Partially digested food called chyme is passed from, stomach to the first part of the intestine, the duodenum.

  • The duodenum receives bile from gall bladder and pancreatic juices from the pancreas through common bile duct.

  • Bile emulsifies fat and pancreatic juices digest carbohydrates and proteins. Final digestion takes place in the intestine.

  • Digested food is absorbed by the numerous finger-like folds in the inner wall of intestine called villi and microvilli. The undigested solid waste moves into the rectum and passes out through cloaca.

  • Frogs respire on land and in the water by two different methods. In water, skin acts as aquatic respiratory organ (cutaneous respiration), Dissolved oxygen in the water is exchanged through the skin by diffusion.

  • On land, the buccal cavity, skin and lungs act as the respiratory organs. The respiration by lungs is called pulmonary respiration. The lungs are a pair of elongated, pink coloured sac-like structures present in the upper part of the trunk region (thorax). Air enters through the nostrils into the buccal cavity and then to lungs. During aestivation and hibernation gaseous exchange takes place through skin.

  • The vascular system of frog is well-developed closed type. Frogs have a lymphatic system also.

  • The blood vascular system involves heart, blood vessels and blood. The lymphatic system consists of lymph, lymph channels and lymph nodes.

  • Heart is a muscular structure situated in the, upper part of the body cavity. It has three chambers, two atria and one ventricle and is covered by a membrane caned pericardium.

  • At triangular structure called sinus, venosus joins the right atrium. It receives blood through the major veins called vena cava. The ventricle opens into a sac like conus arteriosus on the ventral side of the heart.

  • The blood from the heart is carried to all parts of the body by the arteries (arterial system). The veins collect blood from different parts of body to the heart and form the venous system. 

  • Special venous connection between liver and intestine as well as the kidney and lower parts of the body are present in frogs. The former is called hepatic portal system and the latter is called renal portal system.

  • The elimination of nitrogenous wastes is carried out by a well developed excretory system.

  • The excretory system consists of a pair of kidneys, ureters, cloaca and urinary bladder. These are compact, dark red and bean like structures situated a little posteriorly in the body cavity on both sides of vertebral column.

  • Each kidney is composed of several structural and functional units called uriniferous tubules or nephrons. Two ureters emerge from the kidneys in the male frogs.

  • The ureters act as urinogenital duct which opens into the cloaca. In females the ureters and oviduct open seperately in the cloaca. The thin-walled urinary bladder is present ventral to the rectum which also opens in the cloaca.

  • The frog excretes urea and thus is a ureotelic animal. Excretory wastes are carried by blood into the kidney where it is separated and excreted.

  • The system for control and coordination is highly evolved in the frog. It includes both neural system and endocrine glands.

  • The prominent endocrine glands found in frog are pituitary, thyroid, parathyroid, thymus, pineal body, pancreatic islets, adrenals and gonads.

  • The nervous system is organised into a central nervous system (brain and spinal cord), a peripheral nervous system (cranial and spinal nerves) and an autonomic nervous system (sympathetic and parasympathetic). There are ten pairs of cranial nerves arising from the brain, Brain is enclosed in a bony structure called brain box (cranium).

  • The brain is divided into forebrain, mid­brain and hind-brain. Forebrain includes olfactory lobes, paired cerebral hemispheres and unpaired diencephalon. The midbrain is characterised by a pair of optic lobes. Hind-brain' consists of cerebellum and medulla oblongata. The medulla oblongata passes out through the foramen magnum and continues into spinal cord which is enclosed in the vertebral column.

  • Frog has different types of sense organs, namely organs of touch (sensory papillae), taste (taste buds), smell (nasal epithelium), vision (eyes) and hearing (tympanum with internal ears). Out of these, eyes and internal ears are well-organised structures and the rest are cellular aggregations around nerve endings.

  • External ear is absent in frogs and only tympanum can be seen externally,

  • Frogs have well organised male arid female reproductive systems. Male reproductive organs consist of a pair of yellowish ovoid testes, which are found adhered to the upper part of kidneys by a double fold of peritoneum called mesorchium.

  • Vasa efferentia are 10-12 in number that arise from testes. They enter the kidneys on their side and open into Bidder's canal. Finally it communicates with the urinogenital duct 'that comes out of the kidneys and opens into the cloaca. The cloaca is a small, median chamber that is used to pass faecal matter, urine and sperms to the exterior. 

  • The female reproductive organs include a pair of ovaries. The ovaries are situated near kidneys and there is no functional connection with kidneys. A pair of oviduct arising from the ovaries opens into the cloaca separately. A mature female can lay 2500 to 3000 ova at a time. 

  • Fertilisation is external and takes place in water Development involves a larval stage called tadpole Tadpole undergoes metamorphosis to form the adult.

  • Frogs maintain ecological balance because these serve as an important link of food chain and fool web in the ecosystem.    


  • Sickle-celled anaemia is a genetic disease common in South Africa. It is due to change in beta chain of haemoglobin.

  • Thalassemia represents hereditary hemolytic anaemia due to defect in the synthesis of haemoglobin.

  • Large amount of reduced haemoglobin in the arterial blood result a condition called cyanosis.

  • Polycythemia refers to abnormal increase in the number of RBCs.

  • Erythropoietin is a hormone secreted by kidney cells; it stimulates the RBC production in bone marrow.

  • Old non-functional RBCs are destroyed in the spleen, liver and bone marrow. The most important site of RBCs disposal is spleen, so it is called their graveyard.

  • The spleen also serves as a sort of blood bank.

  • Blood is red but no RBCs are found in earthworm; haemoglobin directly dissolved in plasma.

  • Haemocyanin is a copper containing respiratory pigment occuring in arthropods and molluscs. It is much less efficient oxygen carrier. 

Difference between Simple Epithelium and Compound Epithelium 


Simple Epithelium

Compound Epithelium


It consists of single layer of cells

It consists of more than one layer of cells.


All the cells rest on the basement membrane.

The cells of deepest layer rest on the basement membrane. However, the basement membrane is absent in transitional epithelium.


It covers the moist surface where there is little wear and tear.

It covers the surface where constant wear and tear takes place.


It is secretary, absorptive and protective in function.

It is mainly protective in functio­n.

Difference between Tendon and Ligament





It is composed of white fibrous tissue.

It is composed of yellow elastic tissue.


Fibroblasts lie in almost continuous rows.

Fibroblasts lie scattered.


It joins a skeleton muscle to a bone

It joins a bone to another bone.


It is tough and inelastic.

It is strong but elastic.

Difference between Bone and Cartilage





The bone is a hard tissue.

The cartilage is a soft tissue.


Its matrix is composed of tough inflexible material the ossein.

Its matrix composed of a firm, but flexible material, the chondrin.


The matrix is always impregnated with calcium salts.

Calcium salts mayor may not be present in matrix.


Osteocytes are irregular with protoplasmic processes.

Chondroblasts are oval without protoplasmic processes.


Lacunae give off canaliculi.

Lacunae lack canaliculi.


Outer and inner layer of osteoblasts of a bone produce osteocytes.

Such layers of chondroblasts are absent.


The bone is highly vascular

The cartilage is non-vascular.


A bone may have bone marrow in the centre that produces blood corpuscles.

Such structure is absent

Difference between Blood plasma and Blood Serum:


Blood Plasma

Blood Serum


It is the fluid part of normal blood.

It is liquid released blood from clot from.


It is faint yellow in colour.

It is pale yellow in colour     


It contains corpuscles and fibrinogens.

It lacks corpuscles and fibrinogen.


It takes part in clotting.

It does not take part in blood clotting.      

 Q. 1 - Two examples in which the nitrogenous wastes are excreted from body in the form of uric acid are

(a)      Birds and lizards                         

(b)      Mammals and mollusc  

(c)       Insects and bony fishes                        

(d)      Frogs and cartilaginous fishes

Q. 2 - Opening of rectum in frogs is termed as

(a)      Cloa  

(b)      Cloaca          

(c)       Coccyx         

(d)      None of these

Q. 3 - Funnel-like ciliated pits on the ventral side of the kidney in frog are knows as 

(a)      Nephridiopores   

(b)      Nephrostomes     

(c)       Nephrotomes       

(d)      Coelomostomes

Q. 4 - Kidney is not distinguished into cortex and renal medulla in            

(a)      Camel           

(b)      Rabbit          

(c)       Man  

(d)      Frog

Q. 5 - Malpighian tubules are

(a)      Excretory organs of insects                             

(b)      Excretory organs of frog          

(c)       Endocrine glands of insects                            

(d)      Respiratory organs of insects











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