year 7 biology hw questions -...

Year 7 Biology HW Questions

34 minutes

50 marks

of 16

Q1. Nancy is a dancer.

(a) When Nancy dances her arms and legs are moved by pairs of antagonistic muscles.

How do antagonistic muscle pairs work? Tick the correct box.

Both muscles contract at the same time.

One muscle is big and the other is small.

As one muscle contracts, the other relaxes.

One muscle is strong and the other is weak.

Both muscles relax at the same time. 1 mark

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(b) As Nancy dances her breathing changes because she needs more oxygen. The graph below shows how the volume of air in her lungs changes when she dances.

From the graph, give two ways her breathing changes when she dances.

1. .................................................................................................................... 1 mark

2. .................................................................................................................... 1 mark

(c) Nancy’s muscle cells produce carbon dioxide as she dances.

Which of the following shows how the carbon dioxide is removed from Nancy’s body? Tick the correct box.

muscle cells bloodstream windpipe lungs nose

muscle cells windpipe lungs bloodstream nose

muscle cells bloodstream lungs windpipe nose

muscle cells windpipe bloodstream lungs nose 1 mark

maximum 4 marks

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Q2. The diagram below shows six cells.

(a) (i) Give the letters of the two plant cells in the diagrams.

............... and ............... 1 mark

(ii) Which one of these plant cells contains chloroplasts? Give the letter.

............... 1 mark

(iii) Give the function of chloroplasts.

.............................................................................................................

............................................................................................................. 1 mark

(b) (i) Give the letter of the ciliated cell.

............... 1 mark

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(ii) In which part of the body are ciliated cells found?

............................................................................................................. 1 mark

(iii) What is the function of ciliated cells in this part of the body?

.............................................................................................................

............................................................................................................. 1 mark

(c) Give the letter of the cell which transfers genetic information from father to offspring.

............... 1 mark

maximum 7 marks

Q3. Diagram 1 below shows the lungs and the trachea, the airway leading to the lungs. One of the lungs is drawn in section.

diagram 1

(a) In the wall of the trachea, there are pieces of a stiff material called cartilage.

Why is this stiff material necessary in the wall of the trachea?

.....................................................................................................................

..................................................................................................................... 1 mark

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(b) Diagram 2 below shows one alveolus and its blood supply.

diagram 2

(i) Look at diagram 2, above. Gas A enters the blood from the alveolus. Gas B leaves the blood and enters the alveolus. What are the names of gases A and B?

gas A .....................................................

gas B ..................................................... 1 mark

(ii) Give one reason why it is easy for gases to pass across the wall of an alveolus.

.............................................................................................................

............................................................................................................. 1 mark

(c) The diagram below shows a ciliated cell from the lining of the airway.

(i) What is the function of this cell in the airway?

.............................................................................................................

............................................................................................................. 1 mark

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(ii) This cell is affected by substances in cigarette smoke. What effect does cigarette smoke have on the cilia?

.............................................................................................................

............................................................................................................. 1 mark

(iii) Give the name of the substance, in cigarette smoke, which causes addiction to smoking.

............................................................................................................. 1 mark

Maximum 6 marks

Q4. The drawing below shows a barn owl. Barn owls hunt for small animals such as mice.

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(a) (i) Look at the drawing of the barn owl.

Give two ways the barn owl is suited for catching small animals.

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

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

(ii) Draw a line from each animal below to the word that describes it. Draw only two lines.

4 marks

(b) The photograph below shows two young barn owls. They are covered with soft feathers.

Why do the young barn owls need feathers?

.................................................................................................................................

.................................................................................................................................

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(c) Barn owls build nests in farm buildings. Mice eat wheat seeds.

(i) Many old farm buildings have been knocked down so that houses can be built on the farmland.

Give one reason why this has caused the number of barn owls to decrease.

................................................................................................................

................................................................................................................

(ii) Suggest one reason why farmers like to have barn owls on their farms.

................................................................................................................ 3 marks

maximum 7 marks

Q5. The diagram below shows part of a grassland food web.

(a) One year the snail population increased in the grassland area.

How could an increase in the number of snails cause the caterpillar population to increase?

......................................................................................................................

...................................................................................................................... 1 mark

(b) Snail poison can be used to control the number of snails. After some time, each owl contains more poison than each snail. Explain why each owl contains more poison than each snail.

......................................................................................................................

......................................................................................................................

...................................................................................................................... 2 marks

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(c) A scientist wants to record the number of dandelion plants in the grassland area.

Describe how they could use a 1m2 quadrat to estimate the number of dandelions growing in the grassland area.

......................................................................................................................

......................................................................................................................

...................................................................................................................... 2 marks

(d) The table below shows the population numbers for one food chain from the food web.

Complete the pyramid of numbers on the graph paper below to represent this food chain. Label the pyramid to show each animal.

2 marks

maximum 7 marks

organism number

dandelions 200

rabbits 20

foxes 4

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Q6. The diagrams below show the male and female human reproductive systems.

not to scale

(a) The table below contains descriptions of parts of the human reproductive system. Complete the table to give the name of each part.

3 marks

name of part description

the tube that carries an egg to the uterus

the organ that produces sperm

he organ that produces the egg

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(b) The diagram below shows an unborn baby.

Complete the sentences below by filling in the gaps.

In humans, normal pregnancy lasts for .................. months.

When the foetus is ready to be born, muscles in the uterus wall start

to ............................................. . 2 marks

After the baby is born, the .......................................................... connecting

the foetus to the mother is cut. 1 marks

maximum 6 marks

##

(a) This question is about the menstrual cycle. Choose words from the list to complete the sentences.

a daily the uterus the middle an ovary a weekly

the beginning a monthly the end the vagina

Menstruation is part of ......................................................... cycle.

The cycle begins when the lining of ...................................... breaks away.

An ovum (egg) is released from .......................................... at about

.............................................. of each cycle. 4 marks

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(b) During adolescence, boys’ bodies change. Describe two of the changes.

......................................................................................................................

......................................................................................................................

......................................................................................................................

...................................................................................................................... 2 marks

Maximum 6 marks

Q8. (a) The diagram below shows the female reproductive system and a ciliated cell.

not to scale

Ciliated cells move an ovum along part of the reproductive system.

(i) In which part of the reproductive system are ciliated cells found?

............................................................. 1 mark

(ii) Describe how ciliated cells move an ovum along.

...............................................................................................................

............................................................................................................... 1 mark

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(b) The diagrams below represent what happens at fertilisation and after fertilisation has taken place.

not to scale

(i) Some women find it difficult to become pregnant. Doctors have developed a technique in which an ovum is fertilised in a test-tube. An embryo is then implanted into the woman’s reproductive system.

Which stage in part (b) shows an embryo and which stage shows a foetus?

embryo ...........................................................

foetus ............................................................. 1 mark

(ii) Into which part of the woman’s reproductive system is the embryo implanted?

............................................................. 1 mark

(c) (i) Explain why a child can look like both parents but is not identical to either of the parents.

...............................................................................................................

...............................................................................................................

...............................................................................................................

............................................................................................................... 2 marks

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(ii) In the table below, tick one box by each human characteristic to show whether it is:

• inherited only

• inherited and affected by environmental conditions.

1 mark maximum 7 marks

human characteristic

inherited only

inherited and affected by environmental

conditions

eye colour

skin colour

weight

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year 7 biology hw questions -...

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