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Biology Paper 1 - Separate 10AT > 4 Bioenergetics > Flashcards

4 Bioenergetics Flashcards

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1
Q

Is photosynthesis endothermic or exothermic?

A

Endothermic

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2
Q

State the equation of photosynthesis.

A

6CO2 + 6H2O –> C6H12O6 + 6O2

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3
Q

Where does photosynthesis occur in the cell?

A

Chloroplast

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4
Q

What is photosynthesis?

A

Building glucose from carbon dioxide and water using light

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5
Q

Name the pigment in chloroplasts that absorbs light.

A

Chlorophyll

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6
Q

State an adaptation of the leaf for efficient photosynthesis.

A

Broad leaves/Thin/Have chlorophyll/Air spaces/Guard cells to regulate stomata opening

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7
Q

How does higher light intensity affect the rate of photosynthesis?

A

Increase

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8
Q

Apart from light and carbon dioxide concentration, name one other limiting factor of photosynthetic rate.

A

Temperature/Chlorophyll levels

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9
Q

Why would photosynthetic rate decrease at higher temperatures?

A

Enzymes become denatured

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10
Q

Name one use of glucose in plants.

A

Respiration/Make and strenghten cellulose cell wall/Make starch for storage/Make lipids as energy store

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11
Q

Why do plants need nitrates for good growth?

A

Make proteins

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12
Q

State one factor to maintain in a greenhouse for optimal plant growth.

A

High CO2 levels/Constant light/Appropriate temperatures/Regulate watering

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13
Q

Define ‘aerobic respiration’.

A

Exothermic reaction that breaks down glucose to release energy using oxygen

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14
Q

State the equation of aerobic respiration.

A

Glucose + Oxygen –> Carbon dioxide + Water

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15
Q

Is respiration endothermic or exothermic?

A

Exothermic

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16
Q

Where does aerobic respiration occur in the cell?

A

Mitochondria

17
Q

Give one importance of respiration.

A

Metabolic reactions (eg. Build)/Muscle contraction/Mainting body temp/Active transport

18
Q

State one response of the body to exercise.

A

Increase heart rate/breathing rate/Glycogen coverted to glucose/Increase blood flow to muscles

19
Q

What happens to the glycogen stored in muscles when you exercise?

A

Converted into glucose for respiration

20
Q

What is anaerobic respiration?

A

Breakdown of glucose to release small amount of energy without the use of oxygen

21
Q

Name the toxic substance produced by anaerobic respiration.

A

Lactic acid

22
Q

State an effect on your body after anaerobic respiration.

A

Muscle fatigue

23
Q

Define ‘oxygen debt’.

A

Amount of oxygen needed to break down lactic acid

24
Q

What do plants make in anaerobic respiration?

A

Ethanol and carbon dioxide

25
Q

Give one use of yeast doing anaerobic respiration.

A

Making bread/alcohol

26
Q

Give one example of a metabolic reaction in cells.

A

Convert glucose to glycogen,starch,cellulose/Make lipids/proteins/Respiration/Photosynthesis/Breakdown of proteins

27
Q

State a function of liver.

A

Detoxification/Breakdown of old blood cells/Remove lactic acid (convert to glucose)

28
Q

Pollen grains grow down into female flowers on their way to fertilising an egg. In the flower tissue, oxygen concentrations are low. Suggest which molecules are produced as a pollen grain respires

A

Ethanol and carbon dioxide. Pollen grains can respire anaerobically as the pollen tube moves towards an egg.

29
Q

Describe how anaerobic respiration is important in bread making

A

The anaerobic respiration of) yeast is involved. Bubbles of carbon dioxide make the bread rise

30
Q

Define the inverse square law.

A

For a type of electromagnetic radiation such as light, as the distance from the light source increases, light intensity is inversely proportional to the square of the distance.

31
Q

Explain how some plants are adapted to growing in the shade

A

Shade-adapted plants produce more chlorophyll (so that they are more efficient at absorbing light. This allows them to photosynthesise at lower light intensities.

32
Q

Describe an experiment to investigate the effect of the presence of chlorophyll on photosynthesis

A

1) use a plant with variegated leaves
2) kill and preserve a leaf by dipping it in boiling water
3) decolorize/remove chlorophyll from the leaf by immersing it in hot alcohol
3) dip it in water to soften it
4) place in a Petri dish and flood with iodine solution
5) a blue-black colour indicates the presence of starch
6) the parts of the leaf that contained chlorophyll will stain blue-black, indicating that chlorophyll is required for photosynthesis

33
Q

A student investigated the effect of different parts of the spectrum on photosynthesis. She covered three test tubes containing pond weed with plastic filters. She counted the bubbles produced over one minute intervals. Suggest how the student could check the repeatability of her results.

A

by carrying out the experiment/repeating it several times

the student can see how close they are together, ie repeatable

Biology Paper 1 - Separate 10AT (14 decks)

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