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Q no:1》How girth of stem increase from year to year?
Q no:2》 How young stem gives mehnical support to plant body?
Q no: 3 》Why leaves of "touch me not" close down on touching?
Q no: 4》Write five functions of skeleton?
Q no: 5》How does a muscles become fatigued?
Q no: 6》Where does a muscles recieve the energy from to contract?