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Answers
WHY IS SWEATING ADVANTAGEOUS FOR HUMAN?
ANS) Sweating helps cool down the body. Water is released through glands in the skin, evaporates off the skin and the body is cooled. During exercise, muscles heat up more, so more sweat is needed.
WRITE THE CHARACTERISTICS AND NORMAL CONSTITUENTS OF URINE.
ANS) Urine is an aqueous solution of greater than 95% water. Other constituents include urea, chloride, sodium, potassium, creatinine and other dissolved ions, and inorganic and organic compounds. Urea is a non-toxic molecule made of toxic ammonia and carbon dioxide.
NAME ANY TWO ABNORMAL CONDITIONS OF HUMAN EXCRETORY SYSTEM AND WRITE THEIR CAUSE.
ANS) Diseases that affect the excretory system are nephritis, uraemia, kidney stone, polyuria, anuria, oedema, etc. These diseases are not fatal if diagnosed and treated early. A healthy lifestyle can also prevent most of these diseases.