OCR GCSE Combined Science A (Gateway) Biology Paper 7 Higher June 2018 question paper J250/07

1h 10m 60 marks

16 questions

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Which of these statements about photosynthesis is correct?

A Single stage endothermic reaction

B Single stage exothermic reaction

C Two stage endothermic reaction

D Two stage exothermic reaction

$Question 1, shown as an image$

[1]

Answer

Practise questions on Photosynthesis 16 Qs

The graph shows how one limiting factor affects the rate of photosynthesis.

$Question 2, shown as an image$

Which limiting factor is having the effect shown in the graph?

A Carbon dioxide concentration

B Humidity

C Light intensity

D Temperature

$Question 2, shown as an image$

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Practise questions on Limiting factors in photosynthesis 13 Qs

The picture shows cells from the centre of a root, seen using a light microscope.

Which type of transport cell is labelled X ?

A Phloem

B Root hair

C Stomata

D Xylem

$Question 3, shown as an image$

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Answer

Practise questions on Xylem and phloem 7 Qs

The diagram shows a motor neurone.

What is the function of part X ?

A Generates an impulse

B Insulates the axon

C Slows down the speed of an impulse

D Stops an impulse travelling the wrong way

$Question 4, shown as an image$

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Practise questions on The nervous system 8 Qs

A student investigates an enzyme controlled reaction. She collects the gas produced during the reaction in a gas syringe.

The diagrams show the volume of gas in the gas syringe at the start and after five minutes.

What is the rate of the reaction?

A 0.625 cm³ / min

B 1.6 cm³ / min

C 3.6 cm³ / min

D 8 cm³ / min

$Question 5, shown as an image$

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Practise questions on Enzymes 10 Qs

An elephant has a volume of 4.80 m³.

The surface area to volume ratio of the elephant is 3.84.

Calculate the surface area of this elephant.

A 0.80 m²

B 1.25 m²

C 8.64 m²

D 18.43 m²

$Question 6, shown as an image$

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Answer

Practise questions on Surface area to volume ratio 7 Qs

The graph shows blood glucose levels of one individual after they have eaten a meal.

Explain the change in blood glucose levels after 120 minutes.

A Glucagon is released to convert the glucose to glycogen.

B Glucagon is released to convert the glycogen to glucose.

C Insulin is released to convert the glucose to glycogen.

D Insulin is released to convert the glycogen to glucose.

$Question 7, shown as an image$

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Answer

Practise questions on Blood glucose regulation 10 Qs

Translocation is a process that occurs in plants.

	Transport tissue Substances Direction of Involves active transported movement transport
A	Phloem Sucrose Two way flow Yes
B	Phloem Mineral ions One direction only No
C	Xylem Mineral ions One direction only No
D	Phloem Sucrose Two way flow No

Which row describes translocation?

$Question 8, shown as an image$

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Answer

Practise questions on Transport in plants 11 Qs

Which of these is not an effect of adrenaline on the body?

A Air passages of the lungs expand

B Blood flow to the digestive system increases

C Blood pressure increases

D Pupils dilate

$Question 9, shown as an image$

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Answer

Practise questions on Hormones and the endocrine system 6 Qs

The table shows the dietary intake of four amino acids by one individual.

It also shows the recommended daily allowance (RDA) for the same individual.

Amino acid	Dietary intake (g/day)	RDA (g/day)
A	1.52	0.95
B	3.98	2.85
C	2.98	2.58
D	2.32	1.36

The individual has taken in more than 100% of the RDA for each of the four amino acids.

Which amino acid in their diet has the highest percentage of the RDA?

$Question 10, shown as an image$

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Answer

Practise questions on Proteins 7 Qs

This question is about circulatory systems.

(a)

The picture shows three different blood vessels X, Y and Z, seen using a light microscope.

(a)(i)

Compare blood vessels X and Z and describe the differences that can be seen in the picture.

[2]

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Practise questions on Exchange and transport in animals 17 Qs

(a)(ii)

Blood vessel Y is a capillary. Explain how the structure of a capillary is adapted to its function.

[2]

Answer

Practise questions on Exchange and transport in animals 17 Qs

(b)

Lungfish are fish that have both gills and a lung.

When in water, the blood flows through the gills. When on land, blood flow to the gills is stopped and the blood enters the lung instead.

The diagram shows the circulatory system of a lungfish.

The lungfish circulatory system is different to that of humans.

Blood in the lungfish can flow through gills and lungs, humans only have lungs.

(b)(i)

Write down one other way the structure of the lungfish circulatory system is different to that of humans.

[1]

Answer

Practise questions on Exchange and transport in animals 17 Qs

(b)(ii)

When lungfish and humans are on land, the human circulatory system is more efficient than that of lungfish.

Suggest why the human circulatory system is more efficient.

[2]

Answer

Practise questions on Exchange and transport in animals 17 Qs

(a)

The diagram shows a cell during one stage of mitosis.

(a)(i)

Describe two things that happen to the chromosomes in the next stage of mitosis.

[2]

Answer

Practise questions on Cell differentiation 6 Qs

(a)(ii)

Chromosomes are made of DNA.

Describe the structure of DNA.

[2]

Answer

Practise questions on Cell differentiation 6 Qs

(b)

After mitosis, cell differentiation takes place.

What is meant by the term cell differentiation ?

[1]

Answer

Practise questions on Cell differentiation 6 Qs

The picture shows plant cells as they are seen using a light microscope.

(a)

The actual length of plant cell X is 75 maths symbol m.

You can use this fact to calculate the magnification of the image.

Explain how.

[2]

Answer

Practise questions on Microscopy 27 Qs

(b)

The same cells can be observed using an electron microscope.

Magnification of the cells can be increased using an electron microscope.

Explain how and why the image may also look different.

[3]

Answer

Practise questions on Microscopy 27 Qs

(c)

A student investigates different conditions that affect photosynthesis.

He sets up four different sets of apparatus, A, B, C and D.

The plants used are all of a similar age and size. Each plant is left under cover at room temperature.

After three days one leaf from each plant is tested for the presence of starch.

(c)(i)

Describe all the stages required to test the leaves for the presence of starch.

[3]

Answer

Practise questions on Microscopy 27 Qs

(c)(ii)

What are the expected results of the starch test on each plant?

Write down reasons for your answers.

[3]

Answer

Practise questions on Microscopy 27 Qs

(a)

Compare the structures of these two carbohydrates.

[2]

Answer

Practise questions on Respiration 15 Qs

(b)

Two students investigate anaerobic respiration using yeast with sucrose solution.

They measure the volume of gas collected every 5 minutes for 40 minutes.

The students then repeat the investigation using yeast with glucose solution.

(b)(i)

Explain how and why the temperature of the solution could change during the investigation and how this could be controlled.

[2]

Answer

Practise questions on Respiration 15 Qs

(b)(ii)

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Practise questions on Respiration 15 Qs

A student investigates the effect of concentration on osmosis.

He cuts out five potato chips of similar mass. The student measures the mass of each potato chip.

He then places the potato chips in different concentrations of sugar solution.

After 30 minutes he removes the potato chips from the solution. He dries them with a paper towel before measuring the new mass.

(a)

The potato chips are dried before the new mass is measured.

Explain why.

[1]

Answer

Practise questions on Transport in and out of cells 11 Qs

(b)

The table shows his results.

Concentration of sugar (mol/dmsolution₃)	At start	Mass of potato chip (g) After 30 minutes	Change in mass (g)	Percentage change in mass
0.0	2.1	2.7	+0.6	+28.6
0.2	2.2	2.3	+0.1	+4.5
0.4	2.0	1.8	−0.2	−10.0
0.6	2.0	1.6	−0.4	−20.0
0.8	2.3	1.7
1.0	2.2	1.6	−0.6	−27.3