Biology N4 - Multicellular Organisms : Homework No.1
Cells, Tissues and Organs
1. State what is meant by a unicellular organism ?
(1)
2. Draw labelled diagrams of (i) an animal cell and (ii) a plant cell.
(2)
3. State the name of one of these unicellular organisms.
(1)
4. State what is meant by a ‘tissue’ ?
(1)
5. Name three types of animal tissue.
(1)
6. Draw an example of a cell from this type of tissue.
(1)
7. Name a plant tissue and explain how the cells it made from are
specialised for its function.
(1)
8. Describe how the structure of each of the following specialised cells is
related to its function;
(i) Red blood cell
(2)
(ii) Sperm cell
(2)
(iii) Palisade mesophyll
(2)
(iv) White blood cell
(2)
9. (a) Give a definition of the biological term ‘organ‘.
(b) Give an example of an organ in the human body.
(1)
(1)
Biology N4 - Multicellular Organisms : Homework No.2
Stem Cells & Meristems
2.2
Cells, Tissues and Organs
1. (a) What are general genes?
(b) What are specific genes?
(1)
(1)
2. Explain how genes are involved in specialisation of cells.
(2)
3. (a) What is a stem cell?
(b) What are the two main types of stem cell found in humans?
(1)
(2)
4. What is the main function of stem cells in adults?
(1)
5. What is the difference between an annual and a perennial plant?
(1)
6. State the function of meristematic cells
(1)
7. In an experiment, a young root was inked at 1mm intervals as shown below;
After 4 days of further growth, the
spaces between the marks were measured
and recorded as per the table below.
Space between
Root tip and mark 1
Marks 1 and 2
2 and 3
3 and 4
4 and 5
5 and 6
6 and 7
7 and 8
8 and 9
9 and 10
Distance (mm)
1.0
(i)
Present the data as a bar graph.
(2)
(ii)
Draw two conclusions from the data
(2)
6.0
7.0
6.5
1.0
1.0
1.0
1.0
1.0
1.0
Biology N4 – Multicellular Organisms : Homework No.3
Control and Communication
1. The diagram below shows part of the central nervous system (CNS) and a nerve to
the heart.
(a) Name the two parts shown in the diagram that make up the central nervous
system.
(1)
(b) Name the area shown on the diagram which controls heart rate.
(1)
2. The three types of neuron involved in blinking are shown in the diagram below
(a) Name neurons P and Q
(2)
(b) Which labelled structure is the effector in the blink response?
(1)
(c) What is the function of a reflex action?
(1)
3. The list below refers to stages in the response of the nervous system to a stimulus.
1. Central nervous system sorts information.
2. Nerve impulses sent to muscle.
3. Nerve impulses sent to central nervous system.
4. Senses detect the stimulus.
5. Response is produced.
What is the correct sequence: A
4>3>1>2>5
B
3>4>2>1>5
C
4>3>2>1>5
D
3>4>1>2>5
(1)
4. Different parts of the brain have different functions.
Copy and complete the diagram below by drawing one line to link each part of the
brain with its correct function.
Part of brain
Function
Cerebrum
controls muscle coordination and balance
Medulla
controls conscious thought, thinking,
emotions and intelligence
Cerebellum
controls unconscious activities
(2)
5. Copy and complete the following table
Endocrine gland
Example of hormone produced
Function of hormone
Thyroid
thyroxine
Controls rate of
metabolism
Pancreas
Ovary
Adrenal glands
(3)
6. Diabetes is a lifelong condition which causes a person's blood sugar level to
become too high. It is also known as diabetes mellitus.
In the UK, around 2.9 million people are affected by diabetes.
(a) Name the two types of diabetes
(1)
(b) Which is the more common type?
(1)
(c) Describe the role of insulin and glucagon in the maintenance of a steady
blood glucose level
(2)
Biology N4 - Multicellular Organisms : Homework No.4
Reproduction
1) The table below gives information about the chromosomes in some human cells.
Which line in the table is correct?
Number of
Number of
Haploid or
Cell
chromosome sets
chromosomes
diploid?
A
nerve
2
23
diploid
B
Egg
1
23
haploid
C
Muscle
1
46
haploid
D
Sperm
2
23
diploid
(1)
2) The diagram below shows the chromosome complement of a cell about to divide
to form gametes.
(a) How many sets of chromosomes does this cell contain?
(1)
(b) Name the type of cell division which produces gametes.
(1)
(c) How many chromosomes will be present in the newly formed gametes?
(1)
3) The diagram below represents a flowering plant.
X
Y
(a) Identify structure X.
(1)
(b) Name the gamete that is produced in structure X.
(1)
(c) The following steps refer to the stages in sexual reproduction in a flowering
plant.
A
Fertilisation.
B
Pollen tube grows until it reaches the ovary.
C
Pollination.
D
The male gamete moves towards the ovule.
Use the letters to arrange the stages in the correct order.
(2)
4) The diagrams below represent the male and female reproductive systems.
E
A
C
G
F
B
D
male reproductive system
H
female reproductive system
(a) Copy the tables below into your jotter and then use the correct letter(s)
from the diagrams to complete the table.
Letters can be used once, more than once or not at all.
Structure
Letter
oviduct
Function
Letter
site of sperm production
sperm tube
site of egg production
uterus
site of fertilisation
testis
(1)
(2)
(b) State the name of the diploid cell produced as a result of fertilisation.
(1)
5) The diagram below shows the process of fertilisation. Use the diagram to
answer the questions.
Cell B
Cell A
Fertilisation
Cell C
(a) Name the following cells:
Cell A
Cell B
(1)
(b) Use the letters to name one example of a haploid and one example of a diploid
cell.
(1)
6) Copy the following sentences and delete one option in each set of brackets to
make the sentences correct.
During meiosis, matching chromosomes pair and separate
gametes
producing
body cells
one set
with
two sets
of chromosomes.
(2)