OCR Gateway GCSE Biology

Topic Questions

2.2 The Challenges of Size

1
Sme Calculator
1 mark

A cell membrane has a thickness of 10 nm.

What will happen to the rate of diffusion if the cell membrane thickness changed to 5 nm?

  • The rate of diffusion halves

  • There is no change in the rate of diffusion

  • The rate of diffusion is 5 times greater

  • The rate of diffusion doubles

Did this page help you?

2
Sme Calculator
1 mark

Which of the following correctly explains why mammals have a double circulatory system?

  • To reduce pressure of blood returning from the lungs to supply cells of the body most efficiently with the reactants for respiration

  • To increase the pressure of blood sent to the lungs to supply cells of the body most efficiently with the reactants for respiration

  • To increase the pressure of blood returning from the lungs to supply cells of the body most efficiently with the reactants for respiration

  • To reduce pressure of blood sent to the lungs to supply the cells most efficiently with the products for respiration

Did this page help you?

3
Sme Calculator
1 mark

Which of the following gives the correct location of the valves?

  • Arteries

  • Capillaries

  • Veins

  • Arteries and veins

Did this page help you?

4
Sme Calculator
1 mark

Which of the following statements correctly explains the effect of root hairs on absorption?

  • Provide a large surface area, maximising the rate of absorption of water and ions by osmosis

  • Provide a large surface area, maximising the rate of absorption of water by osmosis and ions by active transport

  • Increase the surface area, maximising the uptake of water by osmosis and ions by diffusion

  • Provide a large surface area, increasing the rate of absorption of water and ions by active transport

Did this page help you?

5
Sme Calculator
1 mark

Which one of the following graphs most closely represents the relationship between atmospheric humidity and the rate of transpiration from a leaf?

8--q9--ratehumidity

Did this page help you?

6
Sme Calculator
1 mark

A student uses a simple potometer to study the effect of different temperatures on the cut shoot of a plant.

What does the potometer actually measure?

  • Volume of water evaporating from the leaves of the shoot

  • Volume of water produced by respiration in the shoot

  • Volume of water taken up by the shoot

  • Volume of water used in photosynthesis in the shoot

Did this page help you?

7
Sme Calculator
1 mark

Higher tier content only

The surface area of a single red blood cell is 1.5 × 10-4mm2.

The volume is 1 × 10-7mm3.

What is the surface area to volume ratio of a red blood cell?

  • 0.0015 : 1

  • 0.7 : 1

  • 1.5 : 1

  • 1500 : 1

Did this page help you?

8
Sme Calculator
1 mark

The diagram shows a red blood cell.

q13-paper1h-june2018-ocrgcsebio

  Distance oxygen travels
to get to haemoglobin
from blood plasma
Surface area to volume
ratio
Nucleus present
A Large Small Yes
B Short Large Yes
C Short Large No
D Large Large No

Which row in the table shows how red blood cells are adapted for transport of oxygen?

Did this page help you?

9
Sme Calculator
1 mark

Sieve plates are structures found in plants.

What is their location and function?

  • Found in phloem and allow movement of sucrose

  • Found in phloem and allow movement of water

  • Found in xylem and allow movement of sucrose

  • Found in xylem and allow movement of water

Did this page help you?

10
Sme Calculator
1 mark

Which type of plant cell takes in water?

  • Guard cell

  • Phloem cell

  • Root hair cell

  • Xylem cell

Did this page help you?

11
Sme Calculator
1 mark

Which type of human cell is shown in this diagram?

q6-paper1f-june2018-ocrgcsebio

  • Egg cells

  • Red blood cells

  • Sperm cells

  • White blood cells

Did this page help you?

12
Sme Calculator
1 mark

Transpiration has a cooling effect on the leaves of plants.

Which statement best describes how this happens?

  • Evaporation of water from the leaf removes heat energy.

  • Water entering the stomata takes heat energy from the leaf surface.

  • Water dripping off the leaf causes heat energy to be lost.

  • Water falling on the leaf removes heat energy.

Did this page help you?

13
Sme Calculator
1 mark

Which process takes water out of plant leaves into the air?

  • Osmosis

  • Photosynthesis

  • Translocation

  • Transpiration

Did this page help you?

14
Sme Calculator
1 mark

Which row shows the correct direction of blood flow through a double circulatory system?

  • left side of heart body organs right side of heart lungs

  • left side of heart lungs     right side of heart body organs

  • right side of heart  body organs lungs left side of heart

  • right side of heart  lungs body left side of heart

Did this page help you?

15
Sme Calculator
1 mark

How is sugar transported around a plant?

  • Upwards in phloem

  • Upwards in xylem

  • Upwards and downwards in phloem

  • Upwards and downwards in xylem

Did this page help you?

16
Sme Calculator
1 mark

Which diagram shows cells that swell, creating an opening during daylight conditions?

q7-paper1h-nov2020-ocrgcsebio

Did this page help you?

17
Sme Calculator
1 mark

Which substances are absorbed from the soil by the root hair cell?

q3-paper1f-nov2020-ocrgcsebio

  • Carbohydrates and proteins

  • Carbon dioxide and nitrogen

  • Proteins and vitamins

  • Water and mineral ions

Did this page help you?

18
Sme Calculator
1 mark

Which process moves food around in plants?

  • Osmosis

  • Respiration

  • Translocation

  • Transpiration

Did this page help you?

19
Sme Calculator
1 mark

Some plants can wilt if they lose more water than they take up.

Which conditions make a plant most likely to wilt?

  • Higher wind speed and lower temperature

  • Lower wind speed and lower temperature

  • Lower wind speed and higher temperature

  • Higher wind speed and higher temperature

Did this page help you?

20
Sme Calculator
1 mark

The graph shows total water loss from a plant.

q8-paper1f-nov2020-ocrgcsebio

Calculate the water lost between 5 and 15 minutes using the line of best fit.

  • 2.2ml per 100g

  • 2.4ml per 100g

  • 2.6ml per 100g

  • 2.8ml per 100g

Did this page help you?

21
Sme Calculator
1 mark

Marram grass grows on sand dunes with very little water available. It has a leaf that is curled in on itself so that the stomata are hidden on the inside, as shown in the diagram.

q13-paper1f-nov2020-ocrgcsebio

Why does this adaptation help the plant to survive on sand dunes?

  • Increases gas exchange from the stomata.

  • Reduces air movement around the stomata.

  • Increases photosynthesis by the leaf.

  • Increases water uptake by the leaf.

Did this page help you?

22
Sme Calculator
1 mark

A cube of potato is used to investigate the effect of surface area on osmosis.

The cube is 3 × 3 × 3cm.

What is the surface area to volume ratio of the cube?

  • 1:2

  • 2:1

  • 6:1

  • 1:6

Did this page help you?