agra,ahmedabad,ajmer,akola,aligarh,ambala,amravati,amritsar,aurangabad,ayodhya,bangalore,bareilly,bathinda,bhagalpur,bhilai,bhiwani,bhopal,bhubaneswar,bikaner,bilaspur,bokaro,chandigarh,chennai,coimbatore,cuttack,dehradun,delhi ncr,dhanbad,dibrugarh,durgapur,faridabad,ferozpur,gandhinagar,gaya,ghaziabad,goa,gorakhpur,greater noida,gurugram,guwahati,gwalior,haldwani,haridwar,hisar,hyderabad,indore,jabalpur,jaipur,jalandhar,jammu,jamshedpur,jhansi,jodhpur,jorhat,kaithal,kanpur,karimnagar,karnal,kashipur,khammam,kharagpur,kochi,kolhapur,kolkata,kota,kottayam,kozhikode,kurnool,kurukshetra,latur,lucknow,ludhiana,madurai,mangaluru,mathura,meerut,moradabad,mumbai,muzaffarpur,mysore,nagpur,nanded,narnaul,nashik,nellore,noida,palwal,panchkula,panipat,pathankot,patiala,patna,prayagraj,puducherry,pune,raipur,rajahmundry,ranchi,rewa,rewari,rohtak,rudrapur,saharanpur,salem,secunderabad,silchar,siliguri,sirsa,solapur,sri-ganganagar,srinagar,surat,thrissur,tinsukia,tiruchirapalli,tirupati,trivandrum,udaipur,udhampur,ujjain,vadodara,vapi,varanasi,vellore,vijayawada,visakhapatnam,warangal,yamuna-nagar

Difference Between Endosmosis and Exosmosis

Before getting into the differences between endosmosis and exosmosis, let’s have a quick look at what osmosis is.

Osmosis

Osmosis may be defined as a process where water diffuses across a semi-permeable membrane. The diffusion of water across the differential membrane is spontaneous and due to the presence of a concentration gradient. Water diffuses from a region of higher concentration to a region of lower concentration. The process continues until both the chambers attain equilibrium i.e. the same concentration.

The two types of osmosis are endosmosis and exosmosis. Now that we have got an idea of what osmosis is, let’s understand the processes of endosmosis and exosmosis.

1. Endosmosis
The process where the solvent diffuses from the outer region to the inner one is called endosmosis. This diffusion of solvent from the exterior to the interior is because of the higher water potential of the exterior. The concentration of water is higher in the outer region than in the cytoplasm. Such a type of solution where the concentration of cytoplasm is greater than that of the surrounding solution is called a hypotonic solution. When a cell is placed in a hypotonic solution, the solvent diffuses through the semi-permeable membrane and enters the cell. Due to endosmosis, the cell swells and becomes turgid. When water diffuses into the cell, pressure is generated against the cell wall. This pressure is called turgor pressure. The turgor pressure generated by osmosis is responsible for the growth and enlargement of cells. However, the turgor pressure does not cause the cell to burst. It is because of the high rigidity of the cell wall. The amount of pressure exerted on the cell membrane due to the entry of solvent into the cell is termed pressure potential.

Example: Endosmosis is widely seen in the xylem of plants. Roots absorb capillary water from the soil with the help of endosmosis. The water then enters the xylem from where it is carried to the other plant parts. Another example of endosmosis is the swelling of raisins when placed in an isotonic water solution. The water molecules move from the surrounding solution into the cells of raisins. The cells eventually swell. The swelling of raisins stops once equilibrium is achieved.

2. Exosmosis
The process where the solvent diffuses from the inner region to the outer one is called Exosmosis. This diffusion of solvent from the interior to the exterior is because of the higher water potential of the interior. The concentration of water is higher in the cytoplasm than in the exterior region. Such a type of solution where the concentration of cytoplasm is lower than that of the surrounding solution is called a hypertonic solution. When a cell is placed in a hypertonic solution, the solvent diffuses out of the soil through the semi-permeable membrane. Due to exosmosis, the cell shrinks and leads to plasmolysis. Plasmolysis is a phenomenon where water is initially lost from the cytoplasm followed by the vacuole. Due to the loss of water from cells, the protoplast tends to shrink away from the cell wall. Such a type of cell is said to be plasmolyzed.

Example: When grapes are placed in a salt solution, exosmosis occurs. The grapes shrink because the water is lost from their cells. Another example of exosmosis is the transport of water to the cortical cells of the root from the root hair.

Differences between endosmosis and exosmosis
 

Endosmosis

Exosmosis

Endosmosis is the movement of solvent into the cell.

Exosmosis is the movement of solvent out of the cell. 

The direction of solvent: From the surrounding solution into the cell. 

The direction of solvent: From the cell into the surrounding solution. 

The concentration of solute in the cytoplasm is greater than that of the surrounding solution. 

The concentration of solute in the cytoplasm is less than that of the surrounding solution. 

The water potential in the cytoplasm is lesser than that of the surrounding solution.

The water potential in the cytoplasm is greater than that of the surrounding solution. 

Due to endosmosis, the cells swell. 

Due to exosmosis, the cell shrinks. 

Endosmosis occurs in the presence of hypotonic solutions. 

Exosmosis occurs in the presence of hypertonic solutions. 

JEE Repeater

Talk to our expert
By submitting up, I agree to receive all the Whatsapp communication on my registered number and Aakash terms and conditions and privacy policy