Can you think of two more such situations, where we may need to multiply algebraic expressions?

What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?

An express train takes 1 hours less than a passenger train to travel 132 km between Mysore and Bangalore (without taking into consideration the time they stop at intermediate stations).If the average speed of the express train is 11km/h more than that of the passenger train,find the average speed of the two trains.

Think and list the various activities in which we need water.

Think of your daily routine— how can you save water?

Debate the following issue in class. the estimated coal reserves are said to be enough to last us for another two hundred years. Do you think we need to worry about coal getting depleted in this case ? Why or why not ?

Plants are autotrophic. Can you think of some plants that are partially heterotrophic?

Take a sheet of paper. Measure its area. Pile up such sheets of paper of same size to make cuboid. Measure the height of this pile. Find the volumne of the couboid by finding the product of the area of the sheet and the height of this pile of sheets. This activity illustrates the idea that volume of a solid can ve deduce by thsi method also (if the base and top of the solid are congruent and parallel to each other and its edges are perpendicular to the base). Can you think of such objects whose volumne can be found by using this method?

What are the reasons that you can think of for the arthropodfs to constitute the largest group of the animal kingdom?

Do you think the reverse is also true, I,e., is thesum of any two consecutive positive integers is perfect square of a number? Give example to support you answer.