"plants are able to continue to grow and develop once the starch supply in the seed is gone, because they
(1)develop roots to absorb starch from the environment
(2)grow leaves, which use light energy for cell respiration
(3)have chloroplasts and use light energy to make more food
(4)produce more seeds, which contain additional food reserves"

I am pretty sure that plants are able to continue to grow and develop once the starch supply in the seed is gone, because they have chloroplasts and use light energy to make more food. I consider third option to be correct one as it does contain the most essential points to developing. It cathes sunlight due to the photosynthesis which is made of hloroplasts. 
That will definitely help you!

I’m not exactly sure what your trying to ask, but if it’s how an organelle is similar to a body system or a part a nucleus is like a in function. but i don’t fully understand what you’re trying to ask