Basically they say "null hypothesis" according to source:
http://www.statisticshowto.com/what-does-it-mean-to-reject-the-null-hypothesis/
<span>The correct answer is c. The polysaccharides in the plants are breaking down.</span> <span>The hypothesis is something that we predict about a certain thing and we want to test and approve it. In this case, we suppose that the polysaccharides, which are structural components in the plants are breaking down and as a consequence of that the plant<span> can no longer support its own weight.</span></span>
Objects with like charges repel/repulse each other while opposite charges attract each other
The direction of an electric fields is alway the direction electrons would naturally move.
Not sure about the last one, my gut instinct is opposite.
Answer;
b. The cells appear well-defined, indicating the presence of cell walls.
Explanation;
Although, the overall function of the cell is the same, there are some important differences between animal and plant cells.
The first difference is that plant cells have an organelle called chloroplast. Chloroplasts contain a pigment called chlorophyll (which gives the plant its green color).
-Additionally, animal cells are smaller than plant cells and have a membrane around them that is flexible and allows molecules, gases and nutrients to pass into the cell. Plant cells are larger and in addition to a membrane they have a rigid cell wall. The cell wall does not let any material pass so instead the plants cells must have tiny openings between cells like doors between rooms in your house.