Question

Can Anyone Give me the notes of excretory system class 10 ??

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Answer 1

Explanation:

Excretion is a biological process by which an organism get rid of excess or toxic waste products of metabolism. Excretion removes unwanted by-products of metabolism,toxic chemical substances,regulate the ionic concentration of body fluids,regulates water content of body,regulate pH of body fluids.

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Answer 2

Answer:

EXCRETION

The biological process of removal of harmful nitrogenous metabolic waste from the body is called excretion.

Unicellular organisms excrete by diffusion and multicellular organisms use specialized organ to perform same function.

Excretion in human beings

A pair of kidneys, a pair of ureters, a urinary bladder and a urethra constitutes the human excretory system.

Kidneys are present on either side of the backbone in the abdomen.

1. Kidneys produce urine and urine from kidney passes through the ureters into the urinary bladder and remains stored their until it is released through the urethra.

Explanation:

Fig. Human excretory system

Urine is produced to filter out waste products from the blood.

Nephrons are basic structural and functional unit of kidney.

Cluster of thin walled blood capillaries called glomerulus in the nephron filtrate the urine and each cluster is associated with cup shaped end of a tube called Bowman’s capsule.

Fig. structure of nephron

Substances like glucose, amino acids, salts and a major amount of water is selectively reabsorbed from the initial filtrate as the urine flows along the tube.

Reabsorption depends on the amount of excess water in the body and dissolved waste to be excreted.

The urine from kidney enters the long tube called ureter.

Ureter connects the kidney with the urinary bladder and urine from the kidney is passed to urinary bladder and stored in the bladder.

When the pressure in the expanded bladder leads to the urge to urinate, the urine is passed out through urethra.

Excretion in plants

Oxygen, a waste product of photosynthesis is released.

Excess water is removed by transpiration.

Some waste products may get stored in the leaves which fall off.

Many waste products are stored in vacuoles.

Some waste products are stored as resins and gums in old xylem.

Plants excrete some waste materials into the soil around them.

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