It may improve your grades! Take a look at this article from the New York Times: Exercise linked with better grades

And while you're at it, think about this: Exercise lengthens telomeres

And this: Can exercise keep you young?

And maybe you should think about studying. Here's another article that may help you reconsider your approach: Forget What You Know About Good Study Habits.

If you want to guess, you can use the same method I used to pick the test question: http://www.random.org/integers/.

Flower parts in general: http://www.life.illinois.edu/ib/335/Flowers/FloralTerms.html

Convolvulaceae: Morning Glory or Bindweed family

http://en.wikipedia.org/wiki/Convolvulaceae

http://commons.wikimedia.org/wiki/File:Convolvulaceae_spp_Blanco_clean.png

http://www.botany.wisc.edu/garden/UW-Botanical_Garden/Convolvulaceae.html

http://commons.wikimedia.org/wiki/File:Convolvulaceae_2.jpg

Malvaceae: Mallow family

http://www.botany.wisc.edu/garden/UW-Botanical_Garden/Malvaceae.html

http://en.wikipedia.org/wiki/Malvaceae

Onagraceae: Evening Primrose family

Typical structures: http://commons.wikimedia.org/wiki/File:Onagraceae_spp_Sturm43.jpg

http://www.life.illinois.edu/ib/335/Rosoideae1/Onagraceae02.jpg

http://www.life.illinois.edu/ib/335/PS3e-Fig-09-093-0.jpg

http://www.life.illinois.edu/ib/335/Rosoideae1/Onagraceae03.jpg

pollen: http://commons.wikimedia.org/wiki/File:Oenothera_fruticosa_pollen01.jpg

technical characteristics: http://www.life.illinois.edu/ib/335/Rosoideae1/Onagraceae01.jpg

Information on the classification & relationships of various groups of organisms:
UC Berkeley Museum of Paleontology: Eukaryote systematics. http://www.ucmp.berkeley.edu/alllife/eukaryotasy.html

Kidney Physiology in a Nutshell: http://academic.sun.ac.za/med_physbio/med_physiology/dept/kidney.htm (This article is probably wrong about the mechanisms of urea movement across membranes; specific urea transport proteins have been found.)

Stanford University Minority Medical Alliance: http://summa.stanford.edu/

Genencor is a local biotech company that has an internship program: http://www.genencor.com/wps/wcm/connect/genencor/genencor/jobs_and_careers/internships/internships_en.htm