EXCRETION -ELIMINATION OF BODY WASTES,Std-10

 Excretion 

:- The process of removal of toxic wastes from the body of an organism is called excretion.
➞ It takes place in both plants as well as in animals. 
Nature of Excretory wastes
1.Respiratory wastes products
     E.g - Co2 & H2O
2. Nitrogenous Wastes
     E.g- Ammonia , Urea  & Uric acid.

Excretion in Animals

:- Different animals have different organs
  for excretion, like
a. Unicellular organisms
    i. Amoeba :- Through Contractile Vacuole      & diffusion.
   ii. Protozoans , Sponges and
     Coelenterates :- Through diffusion.
b. Flatworms :- Through Flame cells.
c. Earthworms - Through Nephridia

d. Insects :- Through Malpighian tubules.
e. Humans :- Through Kidneys ( nephron).

Excretion in Plants

➞It occurs through - Stomata(leaves),     
  Lenticel(Stems ).
➜ Plants also store some of the waste products in their body ( Collected in leaves , bark and fruits of      the plants).
➞The plants get rid of these wastes by shedding of leaves ,peeling of bark & fruits.

➤ Excretion in Human Beings
 :- Excretion in humans carried out by a set of organs known as excretory system.
:- It consists of
                         * Kidneys - 2(a pair )
                         * Ureters - 2 ( a pair )
                         *  Urinary bladder - 1 and
                         * Urethra
Kidneys
:- Shape - bean shaped.
:- Number - 02.
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