Why do you think plant cells need a cell wall as well as a cell membrane ?

Because a major function of the cell wall is to act as pressure vessels, preventing over-expansion of the cell when water enters. The cell wall, along with the cell membrane, functions also as a filter and gives support to the cell

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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