Photosynthesis

Question 1

what is the word equation. for photosynthesis

Answer 1

carbon dioxide + water ———-> glucose +oxygen

sunlight

Question 2

where is the waxy cuticle

Answer 2

top of a leaf

Question 3

label a diagram of a leaf

Answer 3

cgp page 19

Question 4

why are leaves broad

Answer 4

large surface area exposed to light

Question 5

where is most of the chloroplast found and why

Answer 5

in the palisade layer. Near the top of the leaf so get the most exposure to light

Question 6

which layer of the leaf is transparent

Answer 6

upper epidermis

Question 7

what is the point in the waxy cuticle

Answer 7

to reduce water loss by evaporation

Question 8

what are the limiting factors of photosynthesis

Answer 8

light intestiy
concentration of co2
and temperature

Question 9

what is the symbol equation for photosynthesis

Answer 9

6CO2 +6H20——-> C6H12O6+602

Question 10

what effect does little light have on photosynthesis

Answer 10

slows it down

Question 11

what effect does to little co2 have on photosynthesis

Answer 11

slows it down

Question 12

what effect does temperature have on photosynthesis

Answer 12

higher temperature faster photosynthesis
until too warm (over about 45 degrees)
enzymes denatured
rate of photosynthesis rapidly decreases

Question 13

How to test a leaf for startch

Answer 13

1. kill leaf boil it in water
2. put leaf in boiling tube with ethanol heat in boiling bath (this gets rid of any chlorophyll) the leaf should now be a pale white colour
3. rinse the leaf in cold water and add a few drops of iodine solution. if starch is present iodine will turn black

Question 14

what does startch test show

Answer 14

weather photosynthesis is occurring

Question 15

how to test the rate of photosynthesis

Answer 15

measuring oxygen production using a syringe and a rubber tube and recording the bubbles movement

Question 16

name 3 main mineral ions for growth in plants

Answer 16

Nitrates
phosphates
potassium

magnesium is also needed but only in small amounts

Question 17

what do multicellular organisms need

Answer 17

transport systems

Question 18

what are plants two main transport systems

Answer 18

Xylem tubes

phloem tubes

Question 19

what do xylem tubes transport

Answer 19

The xylem carry water and mineral salts from the roots up the shoot to the leaves in the transpiration stream

Question 20

what do phloem tubes transport

Answer 20

The phloem transport sugars like sucrose, and amino acids from where they’re made in the leaves to other parts of the plant
this movement of food substances around the plant is known as translocation

Question 21

which part of the plant takes in water

Answer 21

root hair cells

Question 22

draw a diagram of a root hair cell

Answer 22

________
/ |
__________________/ |
/ |
/ |
\ |
\__________________ |
\ |
\______|

Question 23

what process does a root hair cell use to absorb water

Answer 23

osmosis

Question 24

what is transpiration

Answer 24

the loss of water from the plant

Question 25

what causes transpiration

Answer 25

evaporation and diffusion

Question 26

what does transpiration do

Answer 26

create a slight shortage of water in the leaf so more is drawn up

Question 27

where does most transpiration occur

Answer 27

in the leaf

Question 28

what four main factors effect the rate of transpiration

Answer 28

Light intensity (brighter light the grater the transpiration) Temperature (warmer transpiration happens faster) Wind speed (higher wind speed higher level of transpiration) Humidity (the drier the air around a leaf the faster transpiration happens )

Question 29

what is used to measure the rate of transpiration

Answer 29

a potometer