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Unit 3 Cells and Human Reproduction
Great ideas in science (The University of Hong Kong)
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Unit 3 Cells and human reproduction
A
Multiple-choice questions
1
Which of the following instruments can give the greatest magnification?
A
Magnifying glass
B
Sunglasses
C
Light microscope
D
Electron microscope
2
Which of the following combinations of objective and eyepiece should be used
in order for the microscope to have a magnification of 25×?
A
5×5
B
5 × 10
C
10 × 10
D
10 × 20
3
Which of the following is the function of structure X in the plant cell below?
X
A
B
C
D
Control activities of the cell.
Carry out photosynthesis.
Store water.
Protect the cell.
-1-
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4
How many times does a cell divide to give 16 daughter cells?
A
1
B
2
C
D
3
4
5
Sex cells of humans are produced in the
A
testes and ovaries.
B
scrotum.
C
sex glands.
D
uterus.
6
Which of the following substances pass from the mother's blood to the foetus
through the placenta?
(1) Carbon dioxide
(2) Food
(3) Oxygen
(4) Wastes
A
(1) and (4) only
B
(2) and (3) only
C
(1), (2) and (4) only
D
(2), (3) and (4) only
7
What is/are the sign(s) of pregnancy?
(1) The breasts become bigger.
(2) The menstrual cycle changes to once every half month.
(3) The uterine lining breaks down.
A
(1) only
B
(3) only
C
(2) and (3) only
D
(1), (2) and (3)
-2-
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B
True or false questions
1
After the egg is fertilized with a sperm, it will develop into a foetus and
then an embryo. The baby will be born after about 40 weeks.
*2
Cell division is a kind of reproduction.
3
Cell wall is an elastic structure and it allows the plant cell to change
shape.
4
During labour, the placenta contracts and pushes the baby out through
the vagina.
-3-
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C
1
2
Short questions
The following pictures show the steps of preparing a slide of onion skin cells.
Using the letters, rearrange them in a correct order. Suggest a kind of stain used
in preparing the slide.
A
B
C
D
The following are structures of the reproductive system. Classify them into two
groups and state the general functions of each group.
testes, sperm ducts, ovaries, oviducts
4
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E
2
Long questions
The following diagram shows in vitro fertilization (IVF) which is helpful for
couples who cannot have babies.
Steps of IVF:
1
Eggs are collected from the
ovaries.
2
3
¯
The eggs are mixed with
the sperms in a dish for
fertilization.
¯
Embryos formed in the dish
are put back to the uterus.
a
Suggest two kinds of couples who need IVF.
b
Which organ of the husband produces sperms?
c
In which part of the body should fertilization occur naturally?
d
The chance of fertilization by IVF is much greater than the natural
process. Suggest one reason.
e
In order to have babies successfully, one important condition in the
process of IVF is needed but not controllable. What is this?
5
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**2 Cows of the same characteristics can be produced by the following method.
male cow A
skin cell from
female cow B
egg from cow B with
cow A
the nucleus removed
2 cells fused together forming cell X
an embryo developed and
put into the uterus of cow
B
a baby cow was born
from cow B some
months later
a
What is the sex of the baby cow?
b
Name the process during which cell X becomes an embryo.
6
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c
Is the baby cow formed from sexual reproduction? Give a reason for your
answer.
d
Which cow (A or B) should have exactly the same characteristics as the
baby cow?
7
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