need asap do not write gibberish answer all questions properly for grade 10

2) Analyze the tree-ring cores provided on the last page. The samples came from the following sources:
• Sample 1: From a living tree from the Bluffs, cored July 1993
• Sample 2: From a tree from R.H King Academy
• Sample 3: From a log found near the road leading to the Beaches
• Sample 4: From a log found in the guild
Analysis of data (tree ring cores are on the last page)
1. Determine the ages of each of the trees.
● Count the rings carefully, remembering that each ring represents one year of growth.
● The pith (central layer) and bark are not counted in determining the age of a sample.
● The youngest ring is closest to the bark and the oldest ring is closest to the pith.
2. Determine the year each tree started growing

3. Determine the year that each tree was killed or cut down
Hints: Look at all four cores. You should see that there are patterns in the rings − some are wide and some are narrow.
Wide rings = tree was growing fast that year, probably because the weather was good
Narrow rings = slow growth, probably linked to regional drought or cold temperatures
All of these trees were growing in the same general area, so if they were alive at the same time, they should show the
same ring patterns. Find segments of the ring patterns that match between cores. You will need to either print out the
samples and cut them so that you can line them up. or you can copy and paste each sample into a paint/ draw program
so that they can be arranged. (be careful to not adjust the size)
4. Now you have found some pattern matches, you need to line up the cores for me by year. (e.g., all the rings
for 1983 are lined up vertically on the page)
5. Record the tree ages in the data table below. / 11 marks , C
Sample Year Cut or Cored Age of Tree Year Growth Began
1 1993
2
3

4

6. On your lined-up tree cores file, mark the tree rings for the year 1965 with a *
7. Sample 1 was cored in 1993, meaning that the outer ring grew that year and so did the bark,. How can you
tell what year Sample 1 started growing? Figure that out and record the year in the data table for
Sample 1. **Each band represents a year

Observations and Questions (/12 marks inquiry and communication)
1. Which samples had a ring that shows that it grew in 1965? /1 mark
2. What kind of growing season (good, bad, exceptionally good) existed that year in Scarborough? How can
you tell? / 2 marks
3. List at least 3 factors you can think of that could affect tree growth. /3 marks
4. If poor tree growth around Scarborough was mainly caused by drought, which years were probably drought
years? How can you tell? (2 marks)
5. Did Scarborough have more years of dry/drought or wet/plentiful rainfall? /1 mark
6. Describe 4 limitations of tree ring data – read below your activity in part 1. /2 marks

7. When you are counting the tree rings, which type of plant cell are you actually counting? /1 mark