Unit 6 - Plant Nutrition

Question 1

Photosynthesis definition

Answer 1

The process by which plants synthesise carbohydrates from raw materials using energy from light

Question 2

Photosynthesis Word equation

Answer 2

carbon dioxide + water -> Glucose + oxygen
(in the presense of chlorophyll and light)

Question 3

Photosynthesis Symbol equation

Answer 3

6C02 + 6H20 -> C6H12O6 +6O2

Question 4

what is chlorophyll?

Answer 4

the protein found within chloroplasts that catalyses reactions

Question 5

Uses of Glucose in plants(5)

Answer 5

1. stored in plants as starch
2. used in cellulose to build cell walls
3. used for respiration
4. converted into sucrose and transported through phloem vessels from source to sink
5. converted into nectar and used to attract pollinators

Question 6

leaf adaptions (2)

Answer 6

1. large surface area - maxamise eposure to sunlight
2. very thin - aid diffusion of O2 and CO2

Question 7

purpose of guard cells

Answer 7

open and close stomata

Question 8

purpose of waxy cuticle

Answer 8

allows light to pass through whilst protecting leaf structure

Question 9

purpose of epidermal cells

Answer 9

offers protection but thin to allow liht through

Question 10

features of palisade cells (5)

Answer 10

1. contain many chloroplasts
2. packed tightly together
3. maxamises surface area
4. large vacuole pushes chloroplasts to edge of cell
5. thin cell walla aid gaseous exchange

Question 11

features of spongey mesophyll (4)

Answer 11

1. irregular shape
2. fewer chlorplasts
3. smaller than plaisade cells
4. spaced out with air pockets in between

Question 12

Limiting factor definition

Answer 12

something that is in short supply that restricts a process.

Question 13

Main limiting factors of photosynthesis (3)

Answer 13

1. light density
2. carbon dioxide concentration
3. temperature
   (also still limited by amount of chlorophyll)

Question 14

effect of light intenisty on photosynthesis

Answer 14

• increases with light intensity
• when increased to a certain point photosynthesis cant go any faster as it is no longer the limiting factor

Question 15

effect of co2 concentration on photosynthesis

Answer 15

• increasing co2 increases photosynthesis
• is a maz rate bc smth new become slimiting

Question 16

effect of temperature on photosynthesis

Answer 16

• too much heat damages enzymes and causes them to denature
• too much heat also evaporates water out of leaves and forces stomata to close
• too little heat can reduce enzymes reaction rate by reducing number of collisions between actie site and substrate

Question 17

what is Mg required for in plants ? signs of defficency

Answer 17

• required for chlorophyll
• yellowing between veins of leaves due to lack of chlorophyll production

Question 18

What is nitrate needed for in plants? signs of defficency
where do plants get nitrate?

Answer 18

• needed for proteins
• stunted growth
• leaves near tips turn yellow
• get from soil

Question 19

ratio of photosynthesis to respiration

Answer 19

• changes over the day cycle
• constantly respiring and releasing co2
• only photo during the day when sunlight is available

Question 20

Net Co2 intake during day vs night

Answer 20

day : photo faster than respire resulting in net co2 intake
night : respire more than phto resulting in net release of co2

Question 21

What is hydrogen carbonate indicator?

Answer 21

a ph indicator that changes colour depending on ph of the solution.

Question 22

Is CO2 acidic or basic ?

Answer 22

acidic

Question 23

what ph color is CO2 at atmosepheric level ?

Answer 23

red