It has rained for several days. A tomato plant root system senses the large amount of water and produces the hormone abscisic acid, which triggers the guard cells to swell. When the guard cells swell, the stomatal pore opens, and water loss increases. Using stored glucose and newly absorbed water, reproduction of flowers begins and tomatoes begin to grow. 1) Written Answer to Scenario 8:
.
2) What two systems are interacting in this scenario? and

During convection, less dense fluid rises and denser fluid sinks.

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.

Which chemical reaction shows photosynthesis? a. water + carbon dioxide + sunlight → oxygen + glucose b. carbon + oxygen → carbon dioxide c. hydrogen + oxygen → water d. nitrogen + hydrogen → ammonia