The number of MPs for all of Canada, as well as the number 'allotted' to each province: Question 1 options: is rigidly fixed by the Constitution and cannot be changed may change from one election to another, generally based on population changes as determined by the census may change with the proviso that the percentage of ridings with a majority of French-speaking voters must not fall below 25 percent of the overall number of ridings, even if this means that such ridings may be smaller than non-francophone ones may change with the proviso that Qubec will always be guaranteed a minimum quota of 25 percent of the overall number of MPs even if this province's population should decrease well below that percentage cannot rise above 435 which coincidentally is also the number fixed for the House of Representatives in the US Congress