a plants require water for survival / to grow
water is necessity_for_life. water_intake_in_plants is event. water_caltrop is plant. water is not necessity_for_life. survive_must has not food_and_water survive_must has food_and_water fruit has water food_and_water is basic_human_requirements_for_sustinence. humans_must has not water_to_survive humans_must has water_to_survive