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ncert biology class 9 cbse regulations class 9th science 5e lesson pl class 9th science companion cells simple permanent tissue 5e lesson plan class9 life science chapter 6 eeg sodium ions compound compound ions simple ions types of ions education law of constant proportion law of conservation of proport mass conservation law law of conservation of mass lesson plan scoience 5e science sieve tubes phloem cells phloem fibres phloem parenchyma phloem vascularbundles vessels tracheids xylem fibres xylem parenchyma complex tissues xylem permanent tissues collenchyma tissue collenchyma cell parenchyma tissue parenchyma cell ppt for 5 e lesson delivery life science lesson plan constructivist approach life science contents biology class 11 plant tissues tissues in plants types of tissues types of meristems intercalary lateral apical meristematic tissues nutrition transportation circulation absorption excretion digestion respiration life processes class10th