3 pp22 2021

Question 1

What can an organism breed with?

Answer 1

Other organisms within the same species and genus

Question 2

What is the correct order of arthropod groups, from those with the most legs to those with the
fewest legs?

Answer 2

myriapods, crustaceans, arachnids, insects

Question 3

How many legs do myriapods have?

Answer 3

36-400

Question 4

How many legs do crustaceans have?

Answer 4

10

Question 5

How many legs do arachnids have?

Answer 5

8

Question 6

How many legs do insects have?

Answer 6

6

Question 7

How is the root hair cell modified for the absorption of water?

Answer 7

It has a large surface area.

Question 8

Define active transport 2

Answer 8

particles move through a cell membrane from a region of lower concentration to a region of higher concentration

using energy from respiration

Question 9

The bases on one strand of a DNA molecule have the sequence CAGCT. What is the sequence of bases on the other strand?

Answer 9

GTCGA

Question 10

10 pg5 The graph shows the effect of temperature on the rate of an enzyme-controlled reaction. Which statements are correct?
1 The collision frequency between substrate and enzyme increases between X and Y.
2 The shape of the active site is altered between Y and Z.
3 The enzyme is denatured irreversibly at X and Z.

Answer 10

1 and 2

Question 11

What is the optimum pH fora digestive enzyme?

Answer 11

7

Question 12

In which process is oxygen a waste product?
A active transport
B aerobic respiration
C anaerobic respiration
D photosynthesis

Answer 12

photosynthesis

Question 13

13 pg 6 Which layer in the leaf contains interconnecting air spaces?

Answer 13

C

Question 14

14 pg 6 Where does egestion take place?

Answer 14

D

Question 15

15 pg 7 The diagram shows a fat globule (P) in one part of the alimentary canal and the same fat globule (Q) as it appears in another part of the alimentary canal. In which part of the alimentary canal is P found?

Answer 15

oesophagus

Question 16

15 pg 7 The diagram shows a fat globule (P) in one part of the alimentary canal and the same fat
globule (Q) as it appears in another part of the alimentary canal. In which part of the alimentary canal is Q found?

Answer 16

ileum

Question 17

What is the product of the reaction amylase catalyses?

Answer 17

simple sugars

Question 18

What is the product of the reaction lipase catalyses? 2

Answer 18

fatty acids and glycerol

Question 19

What is the product of the reaction protease catalyses?

Answer 19

amino acids

Question 20

What is the definition of transpiration?

Answer 20

the loss of water vapour from plant leaves by evaporation of water at the surfaces of the mesophyll cells

Question 21

19 pg 8 The diagram shows the circulation of blood in an organism. In which part of the organism is the location of the capillaries in the box?

Answer 21

mammalian lungs

Question 22

20 pg 9 The photomicrograph shows human blood. Which blood component is a phagocyte?

Answer 22

A

Question 23

How can a vaccination lead to long-term immunity? 4

Answer 23

antigen injected-> lymphocytes
multiply-> antibodies and memory cells produced

Question 24

How much CO2 and Oxygen is in air entering the human lungs?

Answer 24

21% oxygen and 0.04% carbon dioxide

Question 25

How much CO2 and Oxygen is in air exiting the human lungs?

Answer 25

16% oxygen and 4% CO2

Question 26

24 pg 11 The diagram shows the production and excretion of materials from the human body. What is V?

Answer 26

aerobic respiration

Question 27

The diagram shows the production and excretion of materials from the human body. What is W?

Answer 27

deamination

Question 28

The diagram shows the production and excretion of materials from the human body. What is X?

Answer 28

lungs

Question 29

The diagram shows the production and excretion of materials from the human body. What is Y?

Answer 29

urea

Question 30

The diagram shows the production and excretion of materials from the human body. What is Z?

Answer 30

kidneys

Question 31

What is a function of a synapse?

Answer 31

to ensure impulses travel in one direction

Question 32

Hormones and the nervous system both control our bodies. Which statement about the control provided by our hormones is correct? A fast response and long lasting B fast response and short lived C slow response and long lasting D slow response and short lived

Answer 32

C

Question 33

Auxin is a chemical produced by plants. It controls plant growth. Which statement about auxin is correct? A Auxin affects the cells only where it is made. B Auxin is equally distributed in response to light from one direction. C Auxin elongates the cells in the shoot tip. D Auxin is made in the shoot tip.

Answer 33

D

Question 34

How do some antibiotics kill bacteria? A They damage the cell wall. B They damage the endoplasmic reticulum. C They damage the nucleus. D They damage the protein coat

Answer 34

A They damage the cell wall.

Question 35

Which types of contact between humans can spread HIV? 2

Answer 35

blood transfusions and sexual intercourse

Question 36

Which method of birth control works by preventing an egg from being released?

Answer 36

contraceptive pill

Question 37

Defined a chromosome

Answer 37

A thread-like structure of DNA, carrying genetic information in the form of genes

Question 38

The statements describe steps in protein synthesis. 1 Copies of the gene are carried to the cytoplasm as mRNA molecules. 2 Each ribosome assembles amino acids into a protein molecule. 3 The gene coding for a protein is copied in the nucleus. 4 The mRNA molecules pass through ribosomes. Which sequence of steps is correct?

Answer 38

3 -> 1 -> 4 -> 2

Question 39

A sunflower has 17 chromosomes in each pollen nucleus. what process are nuclei produced by in the anthers?

Answer 39

meiosis

Question 40

A sunflower has 17 chromosomes in each pollen nucleus. These nuclei are produced in the anthers. Are they genetically different or identical to all the pollen nuclei produced by those anthers?

Answer 40

different

Question 41

A sunflower has 17 chromosomes in each pollen nucleus.A fter fertilisation the resulting zygote will have how many chromosomes?

Answer 41

34

Question 42

What are people with sickle cell anaemia more susceptible to dying from?

Answer 42

malaria

Question 43

36 Which leaf feature is an adaptation of xerophytes to their environment? A hairs surrounding stomata B large internal hollow spaces C large numbers of stomata D thin cuticle on both surfaces

Answer 43

A hairs surrounding stomata

Question 44

37 pg 14 The graph shows the change in population of an organism over time in an ecosystem. which phase of the population graph is x?

Answer 44

exponential (log)

Question 45

37 pg 14 The graph shows the change in population of an organism over time in an ecosystem. which phase of the population graph is Y?

Answer 45

stationary

Question 46

37 pg 14 The graph shows the change in population of an organism over time in an ecosystem. which phase of the population graph is Z?

Answer 46

death

Question 47

38 pg 15 The diagram shows the structure of a bacterium. The presence of structure X is one reason why bacteria are used in genetic engineering. What is structure X?

Answer 47

plasmid

Question 48

When nitrates enter a lake they cause rapid growth of algae on the surface of the water. This causes the following changes in the lake: 1 The concentration of dissolved oxygen in the water decreases. 2 Fish and other aquatic animals die. 3 Aerobic respiration in decomposers increases. 4 Producers die and decomposition increases. In which order do these changes occur?

Answer 48

4 -> 3 -> 1 -> 2

Question 49

The action of which type of bacteria would cause soil to be lacking in nitrates?

Answer 49

denitrifying