What is produced by anaerobic respiration in yeast?
What is the word equation for aerobic respiration in plants?
A carbon dioxide + water → glucose + oxygen
B glucose + carbon dioxide → water + oxygen
C glucose + oxygen → carbon dioxide + water
D glucose + water → carbon dioxide + oxygen
During aerobic respiration glucose is broken down.
What is released in this process?
Which processes depend on the action of enzymes?
A 1 and 2
B 1 and 3
C 1 only
D 2 and 3
Which description of anaerobic respiration in yeast is correct?
The diagram shows an experiment to investigate gas exchange in a leaf.
In which direction does the ink drop move and for what reason?
A Direction: to the left; Reason: photosynthesis
B Direction: to the left; Reason: respiration
C Direction: to the right; Reason: photosynthesis
D Direction: to the right; Reason: respiration
Which process releases the most energy from one molecule of glucose?
A aerobic respiration
B anaerobic respiration in muscle
C anaerobic respiration in yeast
The diagram shows apparatus used to investigate anaerobic respiration in yeast.
What happens to the coloured liquid?
A moves rapidly to the left
B moves slowly to the left
C moves to the right
D stays still
The list shows four metabolic processes.
1 carbon dioxide + water --> glucose + oxygen
2 glucose --> alcohol + carbon dioxide
3 glucose --> lactic acid
4 glucose + oxygen --> carbon dioxide + water
Which of these processes occur in muscles?
B 2 and 3
C 3 and 4
D 4 and 1
The graph shows the results of an experiment to investigate the rate of respiration of an organism at different temperatures.
What explains the difference between the rate of respiration at 50 °C and that at 30 °C?
A enzymes working faster at 50 °C
B enzymes working more slowly at 50 °C
C less oxygen available at 50 °C
D more oxygen available at 50 °C
The diagram shows an experiment to investigate the respiration of yeast.
Which gas is evolved and which new compound is present after 24 hours?
A Gas evolved = carbon dioxide; New compound = ethanol (alcohol)
B Gas evolved = carbon dioxide; New compound = lactic acid (alcohol)
C Gas evolved = oxygen; New compound = ethanol (alcohol)
D Gas evolved = oxygen; New compound = lactic acid (alcohol)
In which conditions do the leaves of a green plant respire?
Why does anaerobic respiration in muscles release less energy than aerobic respiration?
A Energy is lost in carbon dioxide.
B Energy is lost in oxygen.
C Energy remains trapped in ethanol.
D Energy remains trapped in lactic acid.
Which word equation represents anaerobic respiration in human muscle?
A glucose → carbon dioxide + ethanol (alcohol)
B glucose → carbon dioxide + lactic acid
C glucose → ethanol (alcohol)
D glucose → lactic acid
Four metabolic reactions are shown.
1 carbon dioxide + water → glucose + oxygen
2 glucose → ethanol + carbon dioxide
3 glucose → lactic acid
4 glucose + oxygen → carbon dioxide + water
Which reactions take place in human cells to release energy?
C 2 and 4
D 3 and 4
The graph shows the energy released by two animals through respiration as the external temperature changes.
Which conclusion can be drawn from the graph?
A Animals 1 and 2 release the least energy at 23 °C.
B Animal 2 always respires faster than animal 1.
C As the temperature rises, respiration always increases.
D The rate of respiration is the same for both animals at 23 °C.
Four word equations are shown.
P carbon dioxide + water → glucose + oxygen
Q glucose + oxygen → carbon dioxide + water
R glucose → lactic acid
S glucose → alcohol + carbon dioxide
What are the equations for anaerobic respiration in humans and anaerobic respiration in yeast?
What contains the greatest concentration of lactic acid?
A a bottle of alcoholic drink
B a loaf of freshly baked bread
C muscle cells during vigorous exercise
D yeast cells kept in glucose at 70 °C for 30 minutes
Which chemical could be used to show that cells are respiring aerobically?
A Benedict’s solution
B dilute sulfuric acid
When does respiration take place in animals and plants?
An athlete takes part in a race. The graph shows her breathing rate before, during and after the race.
At which point does her body contain the greatest amount of lactic acid?
How are aerobic and anaerobic respiration similar?
A Both involve breaking down glucose.
B Both need a low concentration of oxygen.
C In muscles, both produce carbon dioxide.
D In yeast, both produce alcohol.
Yeast, warm water and substance Z were put into a test-tube. The apparatus was then set up as shown.
After a while, the lime water began to go cloudy.
What is substance Z?
B carbon dioxide
The table shows some of the features of respiration.
Which row is correct for anaerobic respiration?
Four words are shown below.
alcohol anaerobic sugar yeast
These words can be used in the spaces P, Q, R and S to complete the sentence below.
‘In brewing and bread making, respiration takes place. The micro-organism called
……P……uses ……Q.….. as a source of food. The product of this ……R…… respiration is ……S……
Which combination of words correctly completes the sentences?
The diagram shows two experiments on the gaseous exchange in small aerobic crustaceans.
Soda-lime absorbs carbon dioxide.
Which way does the liquid marker move?