MARKS)
1.
The graph shows how an injection of secretin affects the secretion of pancreatic juice by
the pancreas.
00
10.30.2 (17./15.25.170.0 Volume of pancreatic
Julce secreted/cm"
50 -
40 -
Concentration
In pancreatic
juicelarbitrary
units.
30
Hydrogen carbonate
lons
20-
10
Amylase
O
o
10
20
Timo 7minutes
Injection of
secretin
(a)
(0)
Use the graph to describe the effect of secretin on the pancreas. (04rks)
Explain why the concentration of amylase in the pancreatic juice
decreased shortly after the injection of secretin.
(03mks)
(b)
What other digestive secretion is stimulated by secretin.
(02mks)

What are two reasons for why a species might disappear from the fossil record?

2. what process do mrna and trna work together to complete? (3 points)

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area