Photosynthesis

Question 1

Photosynthesis word equation

Answer 1

carbon dioxide + water = glucose + oxygen

Question 2

photosynthesis reactants

Answer 2

carbon dioxide water light

Question 3

why are leaves thin?

Answer 3

to allow the gases such as carbon dioxide and oxygen to reach the cells easily.

Question 4

why are leaves wide and flat?

Answer 4

This creates a large surface area to absorb as much sunlight as possible

Question 5

what are the veins in a leaf?

Answer 5

they carry water to the cells and carry glucose away.

Question 6

what are stomata on a leaf?

Answer 6

these are pores on the underside of a leaf through which gases move in and out.

Question 7

what are the products of photosynthesis?

Answer 7

glucose and oxygen

Question 8

what is the additional glucose that’s made stored as?

Answer 8

its stored as starch

Question 9

what do you use to test for the presence of starch?

Answer 9

Iodine is used. if the leaf turns a blue/black colour, starch is present.

Question 10

what is soda lime

Answer 10

its a chemical that absorbs carbon dioxide

Question 11

what is sodium hydrogen carbonate

Answer 11

a chemical that produces carbon dioxide

Question 12

what controls photosynthesis and what sort temperature do they work best in?

Answer 12

enzymes and they work better in high temperatures UNDER 40 degrees Celcius

Question 13

what happens to the enzymes if it gets too hot?

Answer 13

they breakdown and are denatured

Question 14

when enzymes denature, what happens to the rate of photosynthesis?

Answer 14

the rate of photosynthesis slows down or stops completely

Question 15

what are the three limiting factors of photosynthesis?

Answer 15

light carbon dioxide temperature

Question 16

what are the ideal conditions to maximise the rate of photosynthesis?

Answer 16

Hight light intensity, high concentration of CO2, high temperatures but below 40 degrees

Question 17

what are the 4 different ways a plant uses glucose that is produced during photosynthesis?

Answer 17

respiration
cellulose
storage
synthesis

Question 18

respiration uses glucose to…

Answer 18

to produce energy in the mitochondria

Question 19

lots of glucose molecules join together to form…

Answer 19

to form cellulose that is used to make cell walls

Question 20

access glucose if stored as…

Answer 20

starch, which can be turned back into glucose when needed

Question 21

glucose in synthesis is combined with…

Answer 21

is combined with nutrients from the soil to form other compounds such as proteins and chlorophyll

Question 22

aerobic respiration word equation

Answer 22

glucose + oxygen = carbon dioxide + water

Question 23

anaerobic respiration word equation

Answer 23

glucose = lactic acid + energy

Question 24

when does the body have to carry out anaerabic respiration?

Answer 24

when the body cannot supply the cells with enough oxygen to break down glucose

Question 25

when lactic acid builds up, what can it cause?

Answer 25

fatigue and sometimes cramps

Question 26

word equation for when lactic acid is broken down by oxygen

Answer 26

lactic acid + oxygen = carbon dioxide + water

Question 27

what is an oxygen debt

Answer 27

the amount of oxygen required after intensive exercise to breakdown and remove the lactic acid.