1.Stomata are: A)pores in plant cells
B)pores on the leaves of a plant
C)photosynthetic organ
D)none of the above
2.Blue black coloration on leaves during test for photosynthesis is
A)confirmation of release of oxygen
B)confirmation of carbohydrate formation
C)confirmation of the formation of Water molecules
D)None of the above

1) b - pores on the leaves of a plant
2) d - none of the above

Explanation:

1) Stomata are pores on the leaves of a plant that help in taking in carbon dioxide and give out oxygen.
2) Blue black coloration on leaves during test for photosynthesis is used to indicate the presence of starch in leaves.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).