7AB Test

Clevedon Community School

Science Department

Year 7AB Test

Cells and Reproduction

26 min

38 marks

Answer all the questions on the paper provided

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1.

The diagrams below show a human ovum (egg) and a human sperm.

membrane nucleus

nucleus

membrane

tail

head

human ovum (egg)

human sperm not to scale

(a)

What are eggs and sperm?

Tick the correct box. animals

cells

organs 1 mark

(b)

Which part does a sperm use to swim towards an egg? ......................................................

1 mark

(c)

Give the name of the male reproductive organ where sperm are made. .......................................................

1 mark

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(d)

The diagram below shows a sperm joining with an egg.

not to scale

What is this process called?

Tick the correct box. fertilisation

growth

nutrition

respiration 1 mark Maximum 4 marks

2.

The drawing shows a baby inside its mother’s uterus.

Some substances pass from the mother’s blood to the baby’s blood.

Other substances pass from the baby’s blood to the mother’s blood.

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Which way, if any, do the substances in the table pass?

Tick one box in each row.

substance

does not pass between passes from the passes from the the mother’s blood and mother’s blood to baby’s blood to the baby’s blood the baby’s blood the mother’s blood

poisons from cigarette smoke oxygen digested food carbon dioxide 4 marks

3.

Drawings A, B, C, D and E show the positions of five organ systems in the human body.

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(a)

The names of the five organ systems are given in the table. By each name, write the letter of the drawing which shows the organ system.

name of organ system

letter of the drawing of the organ system

circulatory system digestive system reproductive system respiratory system skeleton 5 marks

(b)

Which one of these organ systems is completely different in a man and a woman? ..........................................................................................................................

1 mark Maximum 6 marks

4.

The diagram shows a section through the human female reproductive system.

oviduct (fallopian tube) ovary lining of uterus (womb) muscle in wall of uterus

cervix

vagina

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(a)

(i)

How often are eggs normally released in the female reproductive system? .............................................................................................................

1 mark

(ii)

In which labelled part is an egg normally fertilised by a sperm? ..........................................

1 mark

(b)

Fill the two gaps in the sentences below.

A fertilised egg divides into a tiny ball of cells called an embryo.

The embryo attaches to the lining of the uterus. Here the embryo grows to become an unborn baby, called a ...................................... .

It takes about ...................................... months for a baby to develop inside its mother.

2 marks

(c)

The diagram below shows a baby growing in its mother’s uterus.

placenta

muscles in wall of uterus

amniotic fluid

vagina

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(i)

What is the function of the amniotic fluid? ............................................................................................................. .............................................................................................................

1 mark

(ii)

Through which part can harmful substances, such as nicotine, pass from the mother’s blood to the baby’s blood? .................................................

1 mark

(iii)

Give one other harmful substance which may be passed from the mother’s blood to the baby’s blood. ............................................

1 mark

(d)

When the baby is born it is pushed out of the mother’s body.

What happens in the wall of the uterus to push the baby out? ..................................................................................................................... .....................................................................................................................

1 mark Maximum 8 marks

5.

The diagram shows a section through the female reproductive system.

oviduct (fallopian tube)

ovary

uterus

cervix vagina

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(a)

(i)

What happens at fertilisation? ............................................................................................................. .............................................................................................................

1 mark

(ii)

In which labelled part of the female reproductive system does fertilisation normally take place? .............................................................................................................

1 mark

(iii)

In which labelled part of the female reproductive system does the foetus develop? .............................................................................................................

1 mark

(b)

Some women have blocked oviducts.

How do blocked oviducts prevent fertilisation taking place? ..................................................................................................................... .....................................................................................................................

1 mark

(c)

When a baby is born it is pushed out of the mother's body.

Describe what happens in the wall of the uterus to push the baby out. ..................................................................................................................... .....................................................................................................................

1 mark Maximum 5 marks

6.

(a)

The diagram shows a group of cells from the lining of the mouth.

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(i)

Give the name and function of part P. name of part P ......................................................................................................................

1 mark

function of part P ...................................................................................................................... ......................................................................................................................

1 mark

(ii)

Which word describes this group of cells?

Tick the correct box. compound

organism

organ

tissue

1 mark

(b)

The diagram below shows muscle cells from the wall of the human intestine.

(i)

Muscle cells can contract.

Give one reason why muscles are needed in the intestine. ...................................................................................................................... ......................................................................................................................

1 mark

(ii)

Other cells in the intestine produce enzymes.

What effect do enzymes in the intestine have on nutrients such as protein? ...................................................................................................................... ......................................................................................................................

1 mark

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(iii)

Which of the following is required in the diet to keep food moving through the intestine?

Tick the correct box. fat

fibre

protein

starch 1 mark maximum 6 marks

7.

If a pregnant woman drinks beer or wine, some of the alcohol passes to the unborn baby. Alcohol can stop the baby’s brain developing properly. (a)

Join the boxes with three arrows to show the path taken by the alcohol.

mother's circulatory system mother's digestive system

baby's brain baby's circulatory system

1 mark

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(b)

The drawing below shows a baby just before it is born. Draw a line from the letter P to the placenta.

1 mark

(c)

Give two functions of the placenta.

1. .................................................................................................................. ..................................................................................................................

2. .................................................................................................................. ..................................................................................................................

2 marks

(d)

During pregnancy the baby is surrounded by a liquid called amniotic fluid.

Suggest one reason why amniotic fluid is important. ..................................................................................................................... .....................................................................................................................

1 mark Maximum 5 marks

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