B8 Photosynthesis

Question 1

What type of reaction is photosynthesis

Answer 1

Endothermic

Question 2

What is the word equation for photosynthesis

Answer 2

Carbon dioxide + water ——> glucose + oxygen

Question 3

What is photosynthesis

Answer 3

The process of making solube foods from carbon dioxide and water

Question 4

What partt of the plant cells absorbs the light energy

Answer 4

The green chlorophyll in chloropasts

Question 5

What partt of the plant cells absorbs the light energy

Answer 5

The green chlorophyll in chloropasts

Question 6

If starch is present what colour does iodine solution turn

Answer 6

Blue/black

Question 7

What is the substance that plants use to strengthen cell walls

Answer 7

Cellulose

Question 8

Why does carbon dioxide increase the rate of photosynthesis

Answer 8

It will increase availability of carbon in the leaves causing a higher rate of photosynthesis until limited by another factor

Question 9

Why do plants use glucose (3)

Answer 9

For respiratuon
Making cellulose
Making amino acids
Stored as oils and fats
Stored as starch

Question 10

What is the rate of photosynthesis affected by

Answer 10

Light, concentration of c02, temperature

Question 11

What do chloropasts make

Answer 11

Make chlorophyll

Question 12

rate of photosynthesis is increasing whilst light intensity increases however the rate doesnt increase anymore. Why is this?

Answer 12

There is a limiting factor of either c02 or temperature which is preventing the rate pf photosynthesis to increase

Question 13

Bhat happens if the plant gets too hot during photosynthesis

Answer 13

Acrive site in enzymes will denature so reaction of photosynthesiscant take place

Question 14

What does photosynthesis use energy to do

Answer 14

Change carbon dioxide and water into glucose and oxygen

Question 15

What is the part of the cell that absorbs the light inna plant cell

Answer 15

Chlorophyll

Question 16

What type of reaction is photosynthesis

Answer 16

Endothermic

Question 17

What is the symbol equation for photosynthesis

Answer 17

6CO2+6H2O—>C6H12O6+6O2

Question 18

What are the 5 things plants use glucose for

Answer 18

For respiration
To make cellulose
To make amino acids
To be stored into lipids or fats
To be stored as starch

Question 19

Why do plants use glucose to make cellulose

Answer 19

To make strong plant cell walls

Question 20

Why donplants use glucose to make amino acids

Answer 20

So the amino acidscan convert into proteins

Question 21

Why do plants use glucose to be stored as starch

Answer 21

Glucose is turned into starch and stored in roots stems and leaves for when photosynthesis isnt happening like in the winter.

Question 22

What would happen if a plant has too much glucose

Answer 22

Would draw lots of water in and swell up

Question 23

What are the three limiting effcetors that affects the rate of photosynthesis

Answer 23

Light, C02, temperature

Question 24

How is the amount of chlorophyll in a plant a limiting factor

Answer 24

If a plant has a low amount of chlorphyll (by disease such as the tobacco mosaic virus) this means the rate of photosynthesis is reduced because they cant absorb as much light

Question 25

How can yiu chnage the light intensity of a plant in a lab

Answer 25

By changing hte distance of the lamp facing the plant

Question 26

Why is the rate of photosynthesis low at low temperatures

Answer 26

The enzymesnneeded for photosynthesis work more slowly at low temperatures

Question 27

Explain the experiment of pondweed

Answer 27

Place pondweed 10cm away from lamp
Switch on the lamp
Record number of gas bubbles produced in 5 mins
Repeat steps 2,3 with the pondweed at different distances from the lamp