In the course of double fertilization, one sperm cell fuses with the egg and the second one fuses with
the synergids
the polar nuclei of the center cell
the egg as well
the antipodal cells

The correct answer is B. The polar nuclei of the center cell

Explanation:

Double fertilization is a particular and complex process of fertilization that occurs in plants with flowers. This process includes two sperm cells or masculine gametophyte and only one eff or female gametophyte. Because of this, in dobule fertilization one of the two sperm cells fuses with the egg or female gametophyte and this led to the development of seeds. The second masculine gametophyte, on the other hand, fuses with the polar nuclei of the center cell that is in the center of the plant embryo sac and these leads to the development of fruit. Also, after this, it is not possible any other sperm fertilizes the plant. Considering this, it can be concluded the second sperm cell fuses with the polar nuclei fo the center cell.

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step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.