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Worksheets0654_2017_O/N_QP_21_Biology
Total questions: 13
Worksheet time: 13mins
1.What is homeostasis?
the maintenance of the body’s external environment
the maintenance of the body’s internal environment
the processes that produce heat in the body
the removal of wastes from the body
2.What is excretion?
breakdown of materials in kidney cells
chemical reactions in liver cells
removal of undigested food from the gut
removal of waste products
3.What could deforestation cause?
a decrease in carbon dioxide levels and a decrease in flooding
a decrease in carbon dioxide levels and an increase in flooding
an increase in carbon dioxide levels and a decrease in flooding
an increase in carbon dioxide levels and an increase in flooding
4.Which statements about X chromosomes in humans are correct?B
A
B
C
D
5.A child blows into a rubber balloon.
What is the percentage of oxygen inside the balloon?
0%
4%
16%
21%
6.The maternal blood leaving the placenta is different in composition from that arriving.
What are those differences?
A
B
C
D
7.When a suspension of powdered milk is completely digested by a protease enzyme it becomes clear.
The graph shows the time taken for a mixture of protease and powdered milk to clear at different temperatures.
What is this enzyme’s optimum temperature?
5 °C
37 °C
40 °C
50 °C
8.What is the equation for photosynthesis?
6CO2 + 6H2O → C6H12O6 + 6O2
6CO2 + C6H12O6 → 6O2 + 6H2O
6O2 + 6H2O → C6H12O6 + 6CO2
6O2 + C6H12O6 → 6CO2 + 6H2O
9.The diagram shows a section through a villus.
What is the function of structure X?
to absorb amino acids from the intestine
to absorb fatty acids from the intestine
to transport enzymes to the intestine
to transport water to the intestine
10.Why do food chains usually have fewer than five trophic levels?
All the carnivores consume herbivores.
The energy passed on reduces from one trophic level to the next.
There is less protein in each individual higher up the chain.
There is only one producer in each chain.
11.What is osmosis?
the diffusion of sugar molecules from a concentrated solution to a dilute solution through a
partially permeable membrane
the diffusion of sugar molecules from a dilute solution to a concentrated solution through a
partially permeable membrane
the diffusion of water molecules from a concentrated solution to a dilute solution through a
partially permeable membrane
the diffusion of water molecules from a dilute solution to a concentrated solution through a
partially permeable membrane
12.Water enters root hair cells from the soil.
What happens to most of this water after it has entered the cells?
It is used in photosynthesis in the root cells.
It moves out again when the soil is dry.
It moves to the leaves and is lost by transpiration.
The cell uses it in respiration.
13.Mitosis is a process of nuclear division.
What happens to the chromosome number in this process?
It is halved from diploid to haploid.
It is halved from haploid to diploid.
It is maintained by the exact duplication of chromosomes.
It is maintained by the exact fusion of chromosomes.
