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Multicellular Organisms
Homework
NAME:
CLASS:
Multicellular Organisms Homework 2
Reproduction
1. The diagram shows the parts of a flower.
1a. Name part X
(1)
_______
1b. Name the sites of production of both male and female gametes in a flowering
plant.
Female_________________________________
(1)
Male___________________________________
(1)
2. Describe pollination.
_____________________________________________________________________
__________________________________________________________________ (1)
3. Describe the difference between self-pollination and cross-pollination.
________________________________________________________________
________________________________________________________________
____________________________________________________________ (2)
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Multicellular Organisms Homework 2
4. Describe the process of fertilisation in humans.
________________________________________________________________
________________________________________________________________
_____________________________________________________________ (1)
5. In humans which of the following are not normally formed? (circle your
answer)
A
B
C
D
A sperm cell with a Y chromosome
An egg cell with a Y chromosome
An egg cell with an X chromosome
A sperm cell with an X chromosome
(1)
6. Give the meaning of the following terms:
Haploid
__________________________________________________________ (1)
Diploid
__________________________________________________________ (1)
7. Explain why body cells are diploid and gametes are haploid.
________________________________________________________________
________________________________________________________________
___________________________________________________________
Total
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Next Steps:
2
(2)
Multicellular Organisms Homework 2
Propagation and Growing Plants
1. Which of the following is NOT a method of natural vegetative propagation?
(please circle or underline your answer)
A. plantlets
B. offsets
C. cuttings
D. runners
(1)
2. Name 1 method of artificial propagation that gardeners might use?
__________________________________
(1)
Describe how to carry out this method.
________________________________________________________________
______________________________________________________________(1)
3. The steps for taking stem cuttings are shown below.
1. Remove the lower leaves.
2. Place the cuttings into compost.
3. Cut the stem below the node.
4. Cover the pot with a polythene bag.
5. Dip the cut end into the rooting powder.
Which of the following shows the correct sequence of steps?
A. 3
5
4
2
1
B. 3
1
5
2
4
C. 3
4
5
1
2
D. 3
5
2
4
1
(1)
4. Name one plant which is used in medicine and describe what it is used for?
________________________________________________________________
______________________________________________________________ (1)
Total
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3
Multicellular Organisms Homework 2
Growth and Development of Different Organisms.
1. Name 3 essential requirements for seeds to germinate.
_______________________
_______________________
_______________________
(2)
2. Complete the table below:
Nutrient
Chemical Name
Importance of Nutrient to plant
Chemical Symbol
Nitrogen
P
Promotes root growth
Potassium
(3)
3. What effects will smoking cigarettes have on the developing embryo and why?
________________________________________________________________
____________________________________________________________ (2)
4. Your friend’s doctor has told them they are suffering from anaemia. What
mineral is your friend deficient in and what foods would you recommend they
eat in order to correct this?
Mineral _________________________________
(1)
Foods __________________________________
(1)
5. Calcium is an essential mineral in your diet. Which symptoms might you have
if you are deficient in calcium?
A. Scurvey
B. Weak bones and teeth
C. Rickets
D. Anaemia
(1)
Total:
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Next Steps:
4
Multicellular Organisms Homework 2
Nervous Control
1. (a) Different parts of the brain have different functions.
Draw a line to link each part of the brain with its correct function.
Part of the brain
Cerebrum
Medulla
Cerebellum
Hypothalamus
(2)
Function
Regulation of temperature
Control of breathing rate
Conscious responses
Co-ordination of movement
(b) (i) The flow chart below shows the structures in a reflex arc. Complete the chart
by inserting the names of the missing neurones.
(3)
Receptor
e.g heat receptor in skin
Neurone 1
Neurone 2
Neurone 3
Effector
e.g muscle
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Multicellular Organisms Homework 2
(ii) Describe a function of a reflex response
(1)
2. (a) The diagram below shows a section through the brain. Add the two missing
labels.
(2)
(b) The Central Nervous System is made up of the brain and which other structure?
(1)
3. What type of response to a stimulus does not need to be learned and does not
involve conscious thought?
_______________________________________________________________ (1)
4. What is a synapse?
______________________________________________________________ (1)
5. How do electrical impulses transfer across the synapse?
______________________________________________________________ (1)
Total:
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Next steps:
6
Multicellular Organisms Homework 2
Hormonal Control
1. Circle the correct option within the brackets.
Insulin is a hormone released from the (liver / pancreas).
Insulin causes excess glucose to be stored in the (liver / pancreas) as (glucagon /
glycogen).
(Glucagon / Glycogen) is a hormone that causes (glycogen / glucagon) to be released
as glucose in response to a decrease in blood glucose concentration.
(5)
2. Describe the causes and symptoms of diabetes.
(3)
3. Where, in general, are hormones released from?
(1)
4. How are hormones carried around the body to their target organs?
(1)
5. Explain why a hormone only works on cells of its target organ.
(2)
Total
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Next Steps:
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Multicellular Organisms Homework 2
Transport in Plants Homework
1. The diagram below shows two types of structures found in plants.
(a)
Which letter shows the phloem?
(1)
(b) What is the function of the phloem?
__________________________ (1)
(c) The xylem helps to support a plant.
State one other function of the xylem.
(1)
2. Describe the process of transpiration from the root hair to the atmosphere (3)
Total
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Multicellular Organisms Homework 2
The Circulatory System Homework
1. The heart is formed from four chambers. The upper chambers are the left atrium and
the right atrium. The wall of the right atrium has an average thickness of 2mm. the left
atrium wall is on average 3mm thick. The lower chamber on the left side, the left
ventricle has walls on average 18mm thick, compared to 4.5mm in the right ventricle.
(a) Use this information to complete the following table.
Heart Chamber
PS-Selecting (2)
Average wall thickness (mm)
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(b) Express the ratio of the average wall thickness of the right ventricle to that of the left
ventricle as a simple whole number ratio.
PS- Processing (1)
:
Right Ventricle
Left Ventricle
(c) Provide an explanation for the left ventricle having a greater thickness than the right
ventricle.
(2)
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Multicellular Organisms Homework 2
2. What is the function of valves in the circulatory system?
(1)
3. Complete the table below. (3)
Arteries
Thick walls
Presence of
valves
Capillaries
Veins
No
No
No
Role within the
body
Transport blood
back to the heart.
4. Name the blood vessel which provides the heart with its own blood supply. (1)
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Multicellular Organisms Homework 2
Total
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The Respiratory System Homework
1. Circle the collect option in each set of brackets. (3)
Air entering the lungs passes down the (bronchioles / trachea) to the bronchi. To
collect oxygen, blood enters the lungs through the pulmonary (artery / vein) and
returns to the (left / right) atrium of the heart.
2. The diagram below shows an alveolus in the lungs.
State two features of the alveolus that allows efficient gas exchange. (2)
Feature 1
Feature 2
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Multicellular Organisms Homework 2
Total
/5
The Digestive System Homework
1. The diagram shown below shows a villus.
Name the two substances which are absorbed into the lacteal. (2)
Substance 1
Substance 2
2. (i) Complete the table below. (2)
Substrate
Enzyme
Starch
Product
Maltose
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Multicellular Organisms Homework 2
Pepsin
Fat
Fatty acids and glycerol
(ii) Name the components of gastric juice. One has been completed for you. (2)
1
Hydrochloric acid
2
3
3. Describe the function of the acid in the stomach. (2)
4. The diagram below shoes the human digestive system.
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Multicellular Organisms Homework 2
Name the digestive enzymes produced by P and Q. (2)
P
Q
5. Describe how the action of peristalsis moves food through the small intestine. (2)
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Multicellular Organisms Homework 2
6. Give two features of the small intestine which increases the rate of absorption (2)
1
2
7. Which line in the table identifies correctly the functions of the large intestine and the
anus? (1)
Large Intestine
Anus
A
Digests food material
eliminates undigested material
B
Stores undigested material
Digests food material
C
Absorbs water from undigested material
eliminates undigested material
D
Absorbs digested food products
Digests food material
Total
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Genetics And Variation Homework
1. Which line in the table correctly shows the number of chromosomes in a red blood
cell and a sperm cell in humans? (1)
Red Blood Cell
Sperm Cell
A
92
46
B
46
23
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Multicellular Organisms Homework 2
C
46
46
D
23
46
2. The following table shows four blood groups and their frequency in a population.
Blood Group
Frequency in
population (%)
O
44
A
42
B
10
AB
4
(a) Calculate the simplest whole number ratio of the frequency of blood groups O to
AB. (1)
:
Blood Group
O
AB
(b) Name the type of variation shown by these blood groups (1)
3. Feather colour in parrots is controlled by a single gene. Blue feather colour (B) is
dominant to yellow feather colour (b).
(a) A homozygous blue parrot is crossed with a homozygous yellow parrot.
(i) Complete the genotypes of the P generation. (1)
P phenotype
P genotyoe
blue
x
16
yellow
Multicellular Organisms Homework 2
(ii) State the genotype and phenotype of the F1 parrots. (2)
Genotype
Phenotype
(b) An F1 individual is crossed with a true breeding yellow parrot.
Complete the punnet square to show the expected results of this cross. (2)
Genotype of
gametes from F1
parents
Genotype of
gametes from
yellow parents
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Multicellular Organisms Homework 2
Total
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