There is in general not much difference in the rise of BP between exercises for lower body and exercises for upper body.
One reason that could explain any differences would be that lower body exercises are usually done siting and upper body standing, and so there would be a greater rise in pressure in the upper body exercises as standing causes a higher pressure than sitting.
There is another fact: Dynamic exercises such as running, swimming, etc. cause rise only in systolic pressure whereas static exercises like weight lifting cause rise in both systolic and diastolic pressure.
This is well explained physiologically. It is most probably this you are being asked about.
Please read up the links below:
http://www.americanheart.org/presenter.jhtml?identifier=3034814http://us.commercial.lifefitness.com/content.cfm/hypertensionandexercisehttp://www.patienthealthinternational.com/features/5399.aspxI hope this answer was helpful. If you need more information, feel free to ask. For accepting this answer, please click on the green 'accept' button below. Feedback/Bonus will be warmly appreciated.