| 1. Make
a histogram from these results. |
 |
| 2. The
linnet usually lays 5 eggs in a clutch during the month of June but only
4 eggs in the month of August. How can you explain this difference? |
|
| 3. Read
the following information and answer the questions which follow it:
'On average a hen linnet lays 4 eggs in a
clutch, one egg per day. She will start to incubate the eggs once the
last one has been laid. She does this so that all the embryos inside the
four eggs develop at the same time and all the eggs will hatch at the
same time. The eggs are incubated for 12 days.
Once they hatch, the chicks stay in the nest for 12 days before they
learn to fly. When the chicks have just left the nest they are still fed
by their parents for another 21 days. As their feathers grow longer and
their wings become stronger they will finally become fully independent
of their parents.' |
| (a) How
long does it take the parents to raise their offspring? (From the laying
of the first egg to the point where the young become fully independent.) |
Space for your calculation
Answer =
|
| (b) The
breeding season for linnets is from April to August. If a pair of
linnets begin to breed at the beginning of April, how many sets of
chicks (broods) could they rear by the end of August? |
Space for your calculation
Answer =
|
| 4. A
linnet nestling will usually leave the nest 12 days after hatching. If
the nest is disturbed, however, the chicks will leave the nest as early
as 9 days old. If the chicks leave the nest earlier they will be smaller
and weaker. Can you explain why it is necessary for scientists and
photographers to have a special permit to study birds whilst they are
nesting? |
|
