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AQA Biology Paper 1 11-1A > 4 Bioenergetics > Flashcards

Flashcards in 4 Bioenergetics Deck (33)
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1

Is photosynthesis endothermic or exothermic?

Endothermic

2

State the equation of photosynthesis.

6CO2 + 6H2O --> C6H12O6 + 6O2

3

Where does photosynthesis occur in the cell?

Chloroplast

4

What is photosynthesis?

Building glucose from carbon dioxide and water using light

5

Name the pigment in chloroplasts that absorbs light.

Chlorophyll

6

State an adaptation of the leaf for efficient photosynthesis.

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

7

How does higher light intensity affect the rate of photosynthesis?

Increase

8

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

Temperature/Chlorophyll levels

9

Why would photosynthetic rate decrease at higher temperatures?

Enzymes become denatured

10

Name one use of glucose in plants.

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

11

Why do plants need nitrates for good growth?

Make proteins

12

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

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

13

Define 'aerobic respiration'.

Exothermic reaction that breaks down glucose to release energy using oxygen

14

State the equation of aerobic respiration.

Glucose + Oxygen --> Carbon dioxide + Water

15

Is respiration endothermic or exothermic?

Exothermic

16

Where does aerobic respiration occur in the cell?

Mitochondria

17

Give one importance of respiration.

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

18

State one response of the body to exercise.

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

19

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

Converted into glucose for respiration

20

What is anaerobic respiration?

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

21

Name the toxic substance produced by anaerobic respiration.

Lactic acid

22

State an effect on your body after anaerobic respiration.

Muscle fatigue

23

Define 'oxygen debt'.

Amount of oxygen needed to break down lactic acid

24

What do plants make in anaerobic respiration?

Ethanol and carbon dioxide

25

Give one use of yeast doing anaerobic respiration.

Making bread/alcohol

26

Give one example of a metabolic reaction in cells.

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

27

State a function of liver.

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

28

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

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

29

Describe how anaerobic respiration is important in bread making

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

30

Define the inverse square law.

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.