Photosynthesis and Plants

Question 1

What is Photosynthesis

Answer 1

The process where plants make the food glucose. from carbon dioxide and water. It uses the energy in sunlight trapped by the green pigment chlorophyll which is found in structures called chloroplasts

Question 2

Carbon dioxide enters via pores in leaf called

Answer 2

Stomata

Question 3

Oxygen produced diffuses out of the _____ if not required for _________

Answer 3

Stomata
Respiration

Question 4

Water enters the leave in tissue in veins. Water is then absorbed by special cells called

Answer 4

Root hair cells

Question 5

Word equation for Photosynthesis

Answer 5

Carbon Dioxide + water –light–> glucose + oxygen

Question 6

Chlorophyll is located where

Answer 6

In chloroplasts

Question 7

Difference in exothermic and endothermic

Answer 7

Exothermic reaction release energy to surroundings whereas endothermic take in energy from surroundings

Question 8

For photosynthesis to occur what must take place

Answer 8

For photosynthesis to occur, light energy must be absorbed by chlorophyll. In the chloroplasts

Question 9

Is photosynthesis exothermic or endothermic

Answer 9

endothermic as it absorbs light energy

Question 10

How do you destarch a plant

Answer 10

Leave it in the dark for 2 days (24 - 48 hours)

Question 11

What is a variegated plant

Answer 11

A plant who’s leaves are not fully green

Question 12

Testing a leaf for starch steps

Answer 12

Place leaf in boiling water - kills the leaf and stops all chemical reactions
Boil in ethanol - Removes chlorophyll from the leaf so we can see colour changes
Dip in boiling water - washes off ethanol, and softens leaf so we can spread it
Add Iodine - test for the presence of starch - yellow brown - blue black

Question 13

Safety precautions to take when working with ethanol

Answer 13

Ethanol is highly flammable so never use a flame to heat, boil using a water bath and wear safety gloves

Question 14

Is light required for photosynthesis steps

Answer 14

Destarch plant
Cover part of leaf with light proof paper or foil and leave under bright light
Remove covering and test for starch

Question 15

Is carbon dioxide required for Photosynthesis steps

Answer 15

Destarch two plants
place one in a transparent bag that absorbs CO2 and the other in a bag with a container of water
Seal bags and leave plants under light
Test a leaf from each plant for starch

Question 16

What type of plant used when testing leaf for chlorophyll
and steps

Answer 16

Variegated plant

Destarch Plant
Place under light for a few hours
Test one leaf for starch
Observe results

Question 17

Experiment to test oxygen is produces during photosynthesis

Answer 17

Container
Funnel
Water
Pond Wee
Thermometer

Question 18

How would we increase rate of production of bubbles
Is counting bubbles a good method
Can you think of a better way

Answer 18

move light closer
Increase temp
Increase C02 concentration

Counting bubbles is not very accurate, bubbles can be different sizes

Use oxygen electrode and data logger to measure change in oxygen concentration

Question 19

Waxy cuticle function and adaptation

Answer 19

Transparent to allow light through
Water proof to reduce water loss

Physical Defence

Question 20

Epidermis function and adaptation

Answer 20

Physical defence

Transparent to allow light through

Question 21

Spongy mesophyll function and adaptation

Answer 21

Tr