S3 Biology
Regulation, Survival and
Growth
Homework Booklet
Homework 1 – Complete your Practical write up for the effect of temperature on the activity of the
enzyme amylase.
You must include: Aim, Hypothesis, Method, Results, Conclusion, and Evaluation.
Homework 2- Urinary structure, Kidney structure and ADH
Figure 1.
Q1. From Fig. 1 Name parts A, B, D.
and E and give their function. (8)
Q2. Using fig.2.
a) Name part 2. What process takes place here? (2)
b) What substances are reabsorbed into part 5 from
the fluid in the tubule. (2)
c) Name part 7. What is the function of this tube?(2)
Figure 2
Q3. A person has been exercising and forgetting to drink water. Draw a flow diagram or describe how
his body will ensure his internal body conditions will remain at a constant level of water. (2)
Person sweating

Q4. If a person was to increase their blood water concentration above the set point, what effect would
this have on the concentration of urine they produced following the intake of water.
Homework 3 –
Q1. An investigation into food choice in the common snail was carried out. The snails
are only active in humid conditions.
Ten snails were given the choice between equal masses of lettuce, carrot,
cabbage, turnip and onion during a 24 hour period. The mass of each food left was
then measured. The results are shown in the bar chart below.
(a)
Complete the table below to show the order of preference that the snails
show for each food.
most preferred food
first
second
least preferred food
third
fourth
fifth
(2)
(1)
(b)
Suggest why water was put in the container.
(c)
(i)
The investigation was repeated with ten different snails of the same
species. Cabbage was found to be the most preferred food. Suggest
one reason why different results were obtained in the second
investigation.
(1)
(ii)
Identify one factor not already mentioned, that should be kept
constant to ensure that the comparison between the two groups of
snails was fair.
(1)
Homework 4 - Growth patterns
The increase in size and mass of an organism is described as growth. All organisms grow.
Unicellular organisms start life as a small cell and expand into a larger cell. In multicellular organisms
the growth is more spectacular as one cell develops into an adult organism often consisting of many
billions of cells.
Plants show a different pattern of growth to animals. They tend to grow continuously until they die
whereas animals stop growing when they reach adulthood
1.
Plot each graph on graph paper
2.
For each graph describe the pattern of growth
3.
Answer the following questions
a)
Why might a tree loose height after 90 years?
b)
How many times greater does a human weigh at 20 compared to their birth weight.
Data
Tables of growth for 2 different organisms are below.
 The height of a tree was measured over a number of years and the data shown in Table 1.
 The body mass of a human male was measured from birth to adult and the data shown in Table 2.
Table 1: Growth of a tree
Table 2: Growth of a human
Time (years)
Height (m)
Time (years)
Mass (Kg)
0
0
Birth
3
5
1
1
12
10
3
2
20
20
10
3
24
30
16
5
27
40
24
10
37
50
32
13
43
60
36
15
57
70
40
17
70
80
40
20
78
90
40
24
78
100
36
110
4
Homework 5 - Seed dispersal
Use the following information provided or your own research to write notes on four types of seed
dispersal.
For each method of seed dispersal include the following:
 Diagram
 Description.
Fruits can be dry and light and these types of fruits are dispersed by the wind. There are three main
types of wind dispersed fruits parachute, wing-like and pepper pot. The parachute is a parachute of
fine hairs and the seed/fruits float in the air for long distances. This is how dandelion, willowherb and
thistles are dispersed.
Wing —like is where there is an extension of the fruit coat that looks like wings.
This allows the seeds/fruits to be carried by the wind to different places. Fruits
and seeds from the sycamore, ash, lime and elm are all carried this way.
The last wind dispersal method is by the pepper pot, this is where the fruit is shaped like a pepper
pot. This method works by the wind blowing the dead stems about and this releases (shakes) the
very small seeds out. Seeds from poppies and foxgloves are dispersed this way
Another method of dispersal is by animals. Fruits can be brightly coloured and
juicy to attract birds and mammals to eat them. Although the fruit is eaten the
seeds have very hard coats that resist digestive enzymes, allowing them to pass
through the gut and out with faeces. Fruits can also have hooks that stick to animal’s
fur and get carried/dispersed by such attachments. Animals like squirrels also store
nuts underground, if these seeds are forgotten about they can germinate.
Plants are also adapted to disperse their seeds them selves. For example plants
like the geranium and broom disperse their seeds after their fruit coat dries,
producing tension that causes the fruit to explode and release the seeds. Plants
are also able to cross rivers and oceans if part of the
fruit or seed contains air spaces that give buoyancy, this is the way seeds
from water lilies and coconuts are dispersed.
Homework 6 – Horticulture
Find out how horticulturalists use plants ability to reproduce asexually to make new plants
Some methods to investigate include:



Cuttings
Stem grafting
Bud grafting
Choose one and describe what the method involves and give examples of the types of plants used.