B4

Question 1

What is a plants source of energy?

Answer 1

light

Question 2

What is photosynthesis

Answer 2

the process by which plants and some other organisms convert light energy into chemical energy in the form of glucose.

Question 3

Why is photosynthesis an example of an endothermic reaction?

Answer 3

because it takes in energy

Question 4

Where does photosynthesis take place?

Answer 4

the leaves of a plant

Question 5

What sort of reaction is photosynthesis?

Answer 5

endothermic because it takes in energy

Question 6

What is the green chemical on the plant of a leaf and what does it do?

Answer 6

Chlorophyll
absorbs light energy

Question 7

word equation for photosynthesis?

Answer 7

light
carbon dioxide + water -»>glucose +
oxygen. chlorophyll

Question 8

Chemical formula for photosynthesis?

Answer 8

C02 + H20 —> C6H12O6 + O2

Question 9

what factor causes the rate of photosynthesis to increase?

Answer 9

the more light intensity, the faster the rate of photosynthesis
However there will be a point where the rate of photosynthesis no longer increases, which is caused by carbon dioxide in the air, temperature for example

Question 10

3 uses of glucose?

Answer 10

release energy in respiration in mitochondria

To produce starch

To produce amino acids to synthesis proteins

Question 11

Why do farmers use greenhouses if they want to increase the rate of photosynthesis?

Answer 11

Because they can use greenhouses to increase the light and heat and also add extra carbon dioxide

However can be expensive

Question 12

Cellular respiration?

Answer 12

a process which supplies us energy

Question 13

What sort of reaction is respiration?

Answer 13

an exothermic reaction because it releases energy

Question 14

3 reasons humans need energy?

Answer 14

movement
to keep warm
to build larger molecules

Question 15

when does aerobic respiration increase?

Answer 15

when the body needs more energy e.g. exercise

Question 16

Metabolism?

Answer 16

the sum of all the chemical reactions in a cell or the body

Question 17

Glycogen?

Answer 17

a storage from of glucose

Question 18

Respiration?

Answer 18

energy is released from glucose inside the mitochondria is living cells

mitochondria uses glucose to release energy

Question 19

formula for aerobic respiration?

Answer 19

opposite to photosynthesis

6 + 6 —> 6 + 6

Question 20

Lactic acid?

Answer 20

toxic chemicals and too much can cause muscle fatigue and pain

Question 21

Anaerobic respiration in plants?

Answer 21

glucose becomes ethanol + carbon dioxide

(Fermentation)

Question 22

5 uses of glucose in a plant?

Answer 22

respiration to release energy

converting cellulose to make cell wall

converted into lipids and stored in seeds

stored as starch in the roots

combine with nitrate ions to make proteins

Question 23

What does the plant store glucose as starch?

Answer 23

because starch in insoluble

Question 24

inverse square law for photosynthesis practical?

Answer 24

light intensity is proportional to 1/d2

d= final distance/initial distance