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Extra - Science > Biology - key mock practicals > Flashcards

Biology - key mock practicals Flashcards

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Biology 101 flashcards
1
Q

Evidence of photosynthesis - testing for starch

Why is the leaf boiled in water for 1 minute at the start?

A

To break apart the leaf cells

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2
Q

Evidence of photosynthesis - testing for starch

Why is the leaf heated in ethanol?

A

To dissolve and remove the chlorophyll

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3
Q

Evidence of photosynthesis - testing for starch

What colour will iodine turn if starch is present?

A

Blue/black

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4
Q

Evidence of photosynthesis - testing for starch

Why is the plant kept in a cupboard before starting the experiment?

A

No prevent photosynthesis and ensure that there is o starch present at the beginning of the experiment

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5
Q

Gas exchange in plants

What colour is the hydrogencarbonate indicator in atmospheric air?

A

Red

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6
Q

Gas exchange in plants

What colour is the hydrogencarbonate indicator in air with more CO2?

A

Yellow

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7
Q

Gas exchange in plants

What colour is the hydrogencarbonate indicator in air with less CO2?

A

Purple

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8
Q

Gas exchange in plants

Why does the hydrogencarbonate indicator turn yellow in the test tube covered in foil?

A

There is more CO2 present as it isn’t being used up in photosynthesis

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9
Q

Gas exchange in plants

Why does the hydrogencarbonate indicator turn purple in the test tube which is under light?

A

There is less CO2 present as it is being used up in photosynthesis

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10
Q

What is a control experiment?

A

An experiment without any factors, normal conditions

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11
Q

Gas exchange in plants

What would the control variable be?

A

A test tube without a leaf

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12
Q

Evidence of photosynthesis - varying environmental conditions

Why is the pondweed kept in a large beaker of water?

A

To absorb the heat from the lamp and prevent the leaf from changing temperature

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13
Q

Evidence of photosynthesis - varying environmental conditions

What two ways could the rate of photosynthesis be measured?

A

Counting the number of bubbles produced in a certain time

Analyzing the volume of oxygen produced

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14
Q

Evidence for respiration - peas in flasks

What will happen to the temperatures in flasks A and B, and why?

A

Flask A will experience an increase in temperature as the living peas inside will produce heat while respiring

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15
Q

Evidence for respiration - peas in flasks

Why are the peas soaked in milton solution?

A

To kill off bacteria to prevent them from affecting the results

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16
Q

Evidence for respiration - peas in flasks

How could you show that only flask A produces CO2?

A

Bubble the gases give off through limewater, flask A;s will go cloudy

17
Q

Why are control experiments used?

A

To show the organism is causing the change to the variable being measured

18
Q

Testing for biological molecules

What colour will iodine turn if starch is present?

A

Blue/black

19
Q

Testing for biological molecules

Why is a Bunsen burner needed to test for sugars?

A

The substance needs to be heated to around 85 degrees C

20
Q

Testing for biological molecules

What colour does Benedict’s solution turn when sugar is present?

A

Brick red

21
Q

Testing for biological molecules

What is the colour change which occurs when testing for proteins?

A

Blue to purple

22
Q

Investigating factors affecting respiration with yeast

What variables might affect the rate of respiration?

A

Concentration of oxygen, mass of available glucose, temperature or pH

23
Q

Investigating factors affecting respiration with yeast

How is the rate of respiration measured?

A

Time for limewater to go cloudy

24
Q

Investigating factors affecting respiration with yeast

Why is there a thin layer of oil present?

A

To prevent more oxygen from reaching the solution, and to ensure the yeast respires anaerobically

25
Q

Investigating factors affecting respiration with yeast

What is the word equation for respiration in yeast?

A

Glucose –> carbon dioxide + ethanol

26
Q

Investigating factors affecting respiration with yeast

How would you make it a valid test?

A

Only change 1 variable

Extra - Science (9 decks)

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