---

---

1

What are characteristics of all organisms?

1. Characteristics and classification of living organisms  →  1.1. Characteristics of living organisms

1. Characteristics and classification of living organisms  →  1.3. Features of organisms

Open

2

The scientific name for the golden eagle is Aquila chrysaetos. What is the genus of the golden eagle?

1. Characteristics and classification of living organisms  →  1.2. Concept and uses of classification systems

Open

3

Which row shows structures that are present in both root hair cells and palisade mesophyll cells?

2. Organisation of the organism  →  2.1. Cell structure

8. Transport in plants  →  8.2. Water uptake

Open

4

The photomicrograph shows a plant cell. The length of line XY is 90 mm. The actual length of the cell is 30 µm. X Y What is the magnification of the photomicrograph?

2. Organisation of the organism  →  2.2. Size of specimens

Open

5

The diagram shows an experiment demonstrating osmosis using a dialysis tubing bag. glass tube sugar solution water dialysis tubing bag After 30 minutes, the level of the liquid in the glass tube goes 1 because the water had a 2 water potential than the sugar solution. Which words correctly complete the statement?

3. Movement into and out of cells  →  3.2. Osmosis

Open

6

The diagram shows the movement of glucose molecules across a cell membrane. energy glucose T low concentration high concentration cell membrane Which statement describes molecule T?

3. Movement into and out of cells  →  3.3. Active transport

3. Movement into and out of cells  →  3.1. Diffusion

Open

7

The diagram shows part of a protein molecule. X What does X represent?

17. Inheritance  →  17.1. Chromosomes, genes and proteins

4. Biological molecules  →  4.1. Biological molecules

Open

8

The structure of DNA involves two strands coiled together to form a double helix. Which pairing of bases between the two strands is correct?

4. Biological molecules  →  4.1. Biological molecules

17. Inheritance  →  17.1. Chromosomes, genes and proteins

Open

9

What is true of all enzymes?

5. Enzymes  →  5.1. Enzymes

Open

10

Which statement about human enzymes is correct when they are at temperatures above 80 °C?

5. Enzymes  →  5.1. Enzymes

Open

11

An experiment is set up to investigate gas exchange in aquatic plants. aquatic plant hydrogencarbonate indicator solution light The hydrogencarbonate indicator solution is orange at the start. Which colour is it after three hours?

6. Plant nutrition  →  6.1. Photosynthesis

11. Gas exchange in humans  →  11.1. Gas exchange in humans

Open

12

Certain factors are needed for photosynthesis. If a factor is in short supply, it limits the rate of photosynthesis. Which of these could be limiting factors?

6. Plant nutrition  →  6.1. Photosynthesis

Open

13

The haemoglobin concentration in the blood of a person is 80 g / dm3. The accepted normal concentration is 120 g / dm3 or above. Which substance may be lacking in their diet?

14. Coordination and response  →  14.4. Homeostasis

7. Human nutrition  →  7.1. Diet

Open

14

Which statement about physical digestion is correct?

7. Human nutrition  →  7.3. Physical digestion

Open

15

Which statement describes the effect of atmospheric humidity on the rate of transpiration?

8. Transport in plants  →  8.3. Transpiration

Open

16

Sucrose and amino acids move around a plant from sources to sinks. Which row shows the sources and sinks?

8. Transport in plants  →  8.4. Translocation

Open

17

Which statements describe how the structures in the circulatory system function?

9. Transport in animals  →  9.1. Circulatory systems

9. Transport in animals  →  9.3. Blood vessels

Open

18

The diagram shows a section through the heart. Which part is the septum?

9. Transport in animals  →  9.2. Heart

Open

19

The cholera bacterium toxin causes dehydration and loss of salts from the blood in humans. Which statement explains the reason for this?

10. Diseases and immunity  →  10.1. Diseases and immunity

13. Excretion in humans  →  13.1. Excretion in humans

Open

20

During inspiration, the processes listed take place. P volume of the thorax increases Q air rushes into the lungs R pressure in the thorax decreases S external intercostal muscles contract T diaphragm moves down, ribs move upwards and outwards What is the correct sequence for these processes?

11. Gas exchange in humans  →  11.1. Gas exchange in humans

Open

21

In the chemical equation for anaerobic respiration in yeast, the numbers have been replaced by the letters W, X, Y and Z. CWHXOW → YCYHZOH + YCOY Which number is Z?

12. Respiration  →  12.3. Anaerobic respiration

21. Biotechnology and genetic modification  →  21.2. Biotechnology

Open

22

A student measured their oxygen consumption before, during and after exercise. The results are shown...

12. Respiration  →  12.3. Anaerobic respiration

11. Gas exchange in humans  →  11.1. Gas exchange in humans

Open

23

Which row shows where glucose will be found in the body of a healthy human after eating a meal?

13. Excretion in humans  →  13.1. Excretion in humans

Open

24

The events listed involve neurotransmitter molecules at a synapse. They bind with receptor proteins. They diffuse across the synaptic gap. They enter the synaptic gap. They are released from vesicles. What is the sequence of events that occur when an impulse arrives at the synapse?

14. Coordination and response  →  14.1. Coordination and response

Open

25

What occurs during accommodation to focus on distant objects?

14. Coordination and response  →  14.2. Sense organs

Open

26

What is a correct statement about auxin in shoots?

14. Coordination and response  →  14.5. Tropic responses

3. Movement into and out of cells  →  3.2. Osmosis

Open

27

What is a correct statement about antibiotics?

15. Drugs  →  15.1. Drugs

18. Variation and selection  →  18.3. Selection

Open

28

Potatoes are stem tubers. A tuber can be placed in the ground to grow into another plant, which can grow many more tubers. 4 months The diploid number of the potato plant is 24. How many chromosomes will there be in the cells of the stem, the leaf and the pollen?

17. Inheritance  →  17.1. Chromosomes, genes and proteins

16. Reproduction  →  16.3. Sexual reproduction in plants

Open

29

Which row about asexual reproduction is correct?

16. Reproduction  →  16.1. Asexual reproduction

17. Inheritance  →  17.4. Monohybrid inheritance

Open

30

The statements describe how a protein is made. mRNA passes through a ribosome. mRNA molecules carry a copy of the gene to the cytoplasm. The gene coding for the protein is copied in the nucleus. Ribosomes assemble amino acids into proteins. What is the order of statements that describes how a protein is made?

17. Inheritance  →  17.1. Chromosomes, genes and proteins

Open

31

Which parents could produce offspring with blood group O?

17. Inheritance  →  17.4. Monohybrid inheritance

Open

32

The diagram shows the inheritance of albinism in one family. Albinism is an inherited condition caused by a recessive allele. unaffected male unaffected female male with albinism female with albinism key Which individuals must be heterozygous for this condition?

17. Inheritance  →  17.4. Monohybrid inheritance

Open

33

Which term is a genetic change?

18. Variation and selection  →  18.1. Variation

17. Inheritance  →  17.4. Monohybrid inheritance

Open

34

Which adaptation may be present in a xerophyte?

6. Plant nutrition  →  6.2. Leaf structure

18. Variation and selection  →  18.2. Adaptive features

8. Transport in plants  →  8.1. Xylem and phloem

Open

35

The diagram shows energy flow from the Sun, through a food chain and into the environment. Sun plant animal animal What is the form of energy for each numbered arrow?

19. Organisms and their environment  →  19.1. Energy flow

19. Organisms and their environment  →  19.2. Food chains and food webs

Open

36

A few yeast cells were placed in a container of nutrient solution. The graph shows how their population size changed over time. population size time Which row shows when the reproduction rate was greater than the death rate for the numbered phases on the graph?

19. Organisms and their environment  →  19.4. Populations

Open

37

The number of Atlantic bluefin tuna fish found in the Atlantic Ocean has significantly decreased in the last 50 years. Which method would make the biggest improvement in the conservation of tuna fish stocks?

20. Human influences on ecosystems  →  20.4. Conservation

Open

38

The bloodworm is an organism that is found in heavily polluted water. The diagram shows where raw sewage flows into a river. Where would there be fewest bloodworms?

10. Diseases and immunity  →  10.1. Diseases and immunity

20. Human influences on ecosystems  →  20.3. Pollution

Open

39

The diagram shows a bacterial cell. Which part is useful in genetic modification?

21. Biotechnology and genetic modification  →  21.3. Genetic modification

21. Biotechnology and genetic modification  →  21.1. Biotechnology and genetic modification

Open

40

Which statement about genetic modification is correct?

17. Inheritance  →  17.1. Chromosomes, genes and proteins

21. Biotechnology and genetic modification  →  21.3. Genetic modification

18. Variation and selection  →  18.3. Selection

Open