Why do plants need sunlight for photosynthesis? Select one:

To generate the water needed in the reactions of photosynthesis.

To provide a source of energy to convert carbon dioxide to sugar.

To warm the plant tissues to a high temperature.

To provide a source of matter needed to produce sugars.

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.