Tips for using the Plant Corner Observation Record Sheet for small classes
Plant growth cycle:
1.G1 phase (the first growth phase), protein and RNA synthesis are vigorous, and cell volume increases significantly;
2.S phase (DNA synthesis phase), completes chromosome replication and forms two chromatids;
3.G2 phase (late stage of DNA synthesis) continues RNA and protein synthesis and constitutes the second growth phase of cells;
4.M phase (mitosis phase) can be subdivided into prophase, metaphase, anaphase and telophase. During this period, the cell completes nuclear and cytoplasmic division, producing new daughter cells.
In daily work and study, SUM is an extremely widely used function and can be learned as an entry-level function. Therefore, overall, the SUM function is not difficult but has a wide range of applications. But don’t underestimate SUM just because it is simple. It also has some little-known tricks! 1. Cumulative sum as shown below, which is the sales performance of a certain company every day and requires the calculation of the daily cumulative amount.
For example, enter the formula in cell D2: =SUM(C$2:C2), press the Enter key to complete and fill downwards.
Note: At this time, C$2 must lock the row mark, so that a reference area from the second row to the downward row will be generated during the pull-down process.
2:Sum with qualified cells
The sum of merged cells has always been a troublesome problem for novices.
Select the cell range D2:D13, then enter the formula in the formula editing bar: =SUM(C2:C13)-SUM(D3:D14), and then press Finish. Note: Be sure to pay attention to the range of the second SUM function. Misplaced, otherwise an error will be reported.
3: Sum of cells with subtotals
How to sum cells with subtotals? In cell C9, enter the formula: =SUM(C2:C8)/2 and press Enter to complete.
The process of subtotaling and summing are used here to repeatedly calculate the above data, so dividing by 2 can get a non-repeating result, which is exactly the desired result.
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