Abus makes a stop at 2: 30,letting off 15 people and letting on 9.the bus makes another stop ten minutes later to let off 4 more people. how does the number of people on the bus after the second stop compare to the number of people on the bus before 2: 30 stop?

Whatever the initial number of people in the bus was, we know that this number underwent the following transformations: after the first stop, we have

After the second stop, we have

So, globally, there are 10 people less at the end.

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.