1.5- nuitrition in plants

Question 1

word eq for photosyntheis

Answer 1

carbon dioxide + water –> glucose + oxygen

Question 2

balanced chem eq for photosunthesis

Answer 2

6CO^2 + 6H^2O –> C^6H^12O^6 + 6O^2

Question 3

identify the energy changes in photosynthesis

Answer 3

light –> chemical

Question 4

identidy teh reactants and products

Answer 4

reactants= water and carbon dioxide
products = glucose and oxygen

Question 5

balanched word eq for photosyntheis

Answer 5

6 molecules of carbon dioxixe, 6 molecules of oxygen –> 6 molecules of oxygen and 1 molecule of glucose

Question 6

write a methid to test a lleaf for starch and include any safety points

Answer 6

• boil water in a beaker and place the leaf inside for 1 minute (makes teh leaf softer and removes wax layer)
• turn the bunsen burner off (we are abt 2 use ethanol –> highly flammable.
• place the leaf into ethanol and put the boiling tube inot a beaker of bioling water until the leaf turns white. (removes chlorophyll so the leaf turns white).
• wash the leaf in boiling water ( ethanol does not react w/ iodine)
• flood the leaf w iodine on a white time and leave to dry. iodine = starch indicator, blue/ black = high starch present.

Question 7

what are the orders of tissue in the cross section of a leaf.

Answer 7

cuticle, upper epidermis, palaside mesohpyll, spongy mesophyll, lower epidermis, cuticle, guard cell, stomata

Question 8

what is an adaptiation

Answer 8

cell orgamnism = change in shapefor an increase in efficiency in f(x).

Question 9

what is the adaptation of the cuticle (waxy layer)

Answer 9

waxy 2 stop the leaf from losing water from evaporating from sun.

Question 10

upper epidermis

Answer 10

transparent 2 allow light to reach chloroplasts in the palaside cells, tissue is thin 2 keep palaaside layer close ti the top leaf.

Question 11

palaside mesophyll

Answer 11

main site of photosyntheis
cells = thin and tall to increas sa for absorbing light.
large no. of chloroplasts = more photosynthetsis.
large vacuole = store water 2 be used for photosynthesis.
tissue = close to the top 2 absorb sunlight.

Question 12

spongy mesophull

Answer 12

this tissue = gases 2 diffuse 2 the palaside layer
air spaces = 2 allow gas exchange.

Question 13

lower epidermis

Answer 13

controls gas exchange and water loss
how to change shape to open holes called the stomata
will change shape 2 stop water loss
stomata = hole = gases to diffuse in and out of the leaf.

Question 14

write a definition of a limiting factor

Answer 14

a factor in the env. that can change the rate of photosynthesis

Question 15

what are limiting factors in phtoosyntehs

Answer 15

• carbon dioxide concentration
• light intensity
• temperature

Question 16

explain why each lf affects the rop

Answer 16

• carbon dioxide concentration, provides more reactants for the reaction.
• temmperator effects the KE of enzymes
• the light intensity provides more energy for the reaction.

Question 17

why do graphs levels of

Answer 17

bc lfs stop becoming lfs and other aspects.

Question 18

write a method 2 investigate how light effects the rop

Answer 18

1. fill a beaker w water ( this will absorb any heat energy and keep the temp the same throughout the experiment)
2. cut a strand of pondweed fromn the plant ( length = same each time)
3. pondweed into boiling tube that contains 1g/l of sodium hydrogen carbonate ( co2 concentartion constant)
4. cute the stem of the pondweed underwater at an angle.
5. put the lamp close to the pondweed for 5 mins.
   6., move the lamp along a 1 meter ruler to adifferent lengths
6. count number of bubbles produced or collect the gas in a gas syringe
7. calculate the rate of bubbles pper minute

Question 19

design an experiment using corms- experiment of co2 concentration on the rop

Answer 19

C- change the concentration of CO
O- organism is teh same type of pondweed
R–3 times for each concentratuon
M- rate of photosyntehis, counting bubbles produced in 5 mins.,
S- same length of pondweed
S- same temp by using water bath around the plant.
S- same light intensity by using the same bulb at the same distance from the plant each time.

Question 20

what mineral ions do plants need and why

Answer 20

• magnesium ions, needed to make chlorophyll, chlorophyll = essential for photosynthesis
• nitrate ions, source of nitrogen 2 make amino acids 2 build proteins .

Question 21

what happens if there are no different ions

Answer 21

no magnesium ions = yellowing between veins of leaves (chlorosis)
no nitrate ions = stunted growth, and yellowing of leaves