When elongated, tube-shaped cells from the lining of the intestine are treated with a certain chemical, the cells sag and become rounded. the internal structures disrupted by this chemical are probably

The internal structures disrupted by this chemical are probably VACUOLES.

Explanation:

A vacuole is a large membrane-bound vesicle in a cell's cytoplasm.

The central vacuole of a cell houses the digestive processes which includes chemicals that come to attack the cell; also it helps the cell regulates it's water concentration during changing environmental conditions.

vacuoles are present in the absorptive cells (enterocytes) covering the wall of the intestine

we would need to see the picture to answer it

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.