chapter 6:plant nutrition

Question 1

Describe photosynthesis

Answer 1

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

Question 2

state the word equation for photosynthesis

Answer 2

carbon dioxide + water —> glucose + oxygen
In the presence of light and chlorophyll

Question 3

What is chlorophyll

Answer 3

a green pigment that is found in chloroplasts

Question 4

how does chlorophyll help in the synthesis of carbohydrates

Answer 4

chlorophyll transfers energy from light into energy in chemicals,for the synthesis of carbohydrates

Question 5

state the balances chemical equation for photosynthesis

Answer 5

6CO2 + 6H2O → C6H12O6 + 6O2

Question 6

What is the glucose mass in photosynthesis used for

Answer 6

-Making sucrose
-releasing useful energy
-storage to use later
-making cellulose
-making nectar to attract pollinators
-making amino acids,to make proteins

Question 7

What is magnesium used for

Answer 7

it is needed to make chlorophyll

Question 8

What is the need of nitrate ions

Answer 8

To make amino acids,to make proteins

Question 9

Why is magnesium ion and nitrate ion important in photosynthesis

Answer 9

Without a source of these elements,plants cannot photosynthesis or grow properly

Question 10

Factors that affect the rate of photosynthesis

Answer 10

-the supply of raw materials (carbon dioxide and water)
-the amount of sunlight
-The temperature
-The quantity of chlorophyll

Question 11

How do you test the effect of light intensity on the rate of photosynthesis

Answer 11

-using an aquatic plant,use a lamp placed at different measured distances from the plant,the closer the lamp the greater the light intensity

Question 12

How do you test the effect of carbon dioxide concentration or temperature on the rate of photosynthesis

Answer 12

-different quantities of sodium hydrocarbon-ate to the water is surrounding the plant.this decomposes in water to give off carbon dioxide

Question 13

Why is a aquatic plant used

Answer 13

They are useful for investigating the rate of photosynthesis becuase we can see bubbles of oxygen being released in water so it would be easy to count the amount of bubbles produced in a set time

Question 14

Testing the effect of light and darkness on gas exchange in an aquatic plant

Answer 14

-we can investigate the effect of light on the net gas exchange in an aquatic plant using a pH indicator such as hydrogen carbonate indicator

Question 15

What is limiting factor

Answer 15

Something present in the environment in such short supply that it restricts life process

Question 16

What are the three main factors which limit the rate of photosynthesis

Answer 16

-temperature
-light intensity
-carbon dioxide concentration

Question 17

what is common in leaves

Answer 17

-they are thin
-large surface area

Question 18

Why is large surface area important

Answer 18

It allows a large amount of sunlight to fall onto the leaf and it increases the rate at which carbon dioxide can diffuse into the leaf from thin air

Question 19

Why is important leaves are thin?

Answer 19

So that sunlight can pass right through the leaf,allowing many cells to photosynthesise so that it helps the carbon dioxide reach the cells quickly by diffusion

Question 20

what is located in the mesophyll layer

Answer 20

1.upper epidermis
2.palisade mesophyll
3.spongy mesophyll
4.lower epidermis

Question 21

What is in the vascular bundle

Answer 21

-xylem
-phloem

Question 22

Function of epidermis

Answer 22

-allows more light to pass through the palisade cells

Question 23

Function of palisade mesophyll cells

Answer 23

Mainly photosynthesis

Question 24

Function of spongy mesophyll

Answer 24

Some photosynthesis take place

Question 25

Function of xylem

Answer 25

Water is provided through the xylem tissue

Question 26

Function of stomata

Answer 26

Carbon dioxide enters by diffusion through the stomata