ans1:knowledge is different from understanding because knowledge is acquired when we add the new experiences in the system of old experiences and understanding is independent from old experiences.
ans2: understanding cannot be passed on because it is abstract and it is the new immediate experience
ans3:yes,the knowledge of understanding is possible and it may be passed on by speech,writing or symbols.
ans 4:according to author knowledge of understanding is acquired while understanding is the emotions of the person.
ans 5:i agree with the author,because understanding is not acquired as these are the emotions of a person while knowledge is acquired because it is in the form of concepts

Sadia please check my comprehension

ans1:The great versatility of the helicopter is found in flying straight in all the directions.
ans2:the dream of flying is not the conventional type of flight,but flying in the way that no one has ever flown,not even bird.
ans3:the wing of conventional aircraft deflects the air when it is in motion.
ans4:the upper surface of the wing decreases the pressure of air above it by suction.thus air from lower surface moves upward.
ans5:the curved shape of the wings gives plane twice as much lift.