Active Oxygen Damage Effect of Chlorophyll Degradation in Rice Seedlings Under Osmotic Stress EFFECTS.OF OSMOTIC STRESS ON OXYGEN FREE RADICAL DAMAGE AND MEMBRANE LIPID PEROXIDATION OF LEAVES IN POPULUS CATHAYANA REHD STUDIES ON DESICCATION-SENSITIVITY AND PEROXIDATION OF MEMBRANE LIPIDS IN JACKFRUIT (ARTOCARPUS HETEROPHYLLUS LAM.) SEEDS