Chp 6

Question 1

Plants convert light energy into s

Answer 1

stored chemical energy during the process of photosynthesis

Question 2

Photosynthesis can be described as a

Answer 2

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

Question 3

The raw materials needed for photosynthesis are

Answer 3

carbon dioxide and water

Question 4

The reaction requires

Answer 4

energy which is obtained when the pigment chlorophyll traps light energy from the Sun

Question 5

Photosynthesis is a chemical reaction that occurs inside some

Answer 5

Plant cells

Question 6

The word equation for photosynthesis is:

Answer 6

Carbon dioxide + water —> glucose + oxygen

Question 7

Chlorophyll is a

Answer 7

green pigment that is present inside plant cells

Question 8

Chlorophyll reflects

Answer 8

green light and so gives plants their characteristic green colour

Question 9

Chlorophyll is found within

Answer 9

Chloroplasts

Question 10

Chlorophyll can be seen within chloroplasts under a

Answer 10

light microscope

Question 11

Glucose is produced during

Answer 11

Photosynthesis but it’s quickly converted or used into something else

Question 12

Some glucose is come better into

Answer 12

Starch which is stored in chloroplasts

Question 13

Some glucose is come better into

Answer 13

Starch which is stored in chloroplasts

Question 14

How do we test for starch in plant

Answer 14

Boil the leaf to kill cells and break down cell walls and membranes
Place in hot ethanol to remove chlorophyll
Rinse it to soften
Put it in a white tile and add iodine solution
Turns blue black

Question 15

Investing the need for chlorophyll

Answer 15

Use a variegated leaf with no chloroplyll
Add iodine solution it will remain orange brown on white areas of the leave and on the green areas blue black

Question 16

Investigating the need for chlorophyll

Answer 16

The starch test can be used to determine whether photosynthesis has occurred
Variegated leaves can be used
White parts remain the orange brown in the presence of iodine solution while the green part will turn blue black because of starch

Question 17

Investigating the need for light

Answer 17

Place a plant in a dark cupboard for 24 hours before the investigation
This will ensure the leaves have no starch
Cover part of the leaf with aluminum foil and place in singling exposed parts of the leaf will photosynthesis and store starch after performing the starch test a color change is absorbed
The exposed parts turn blue black and the covered orange and brown
No photosynthesis occurred

Question 18

Investigating the need for carbon dioxide

Answer 18

Place two plants in a dark cupboard 24h before the investigation this ensures the leaves have no starch
Place each destarxhed plant in a bell jar and a will contain chemicals to absorb carbon dioxide a soda lime cover the pore with plastic to prevent carbon dioxide escaping after use starch results on both the one exposed with carbon dioxide will turn blue black and the other orange brown

Question 19

Why would water be there in investing carbon dioxide

Answer 19

Water and soda lime remove carbon dioxide

Question 20

Two control variables in carbon fldicode experiment

Answer 20

Same plants and same temperature

Question 21

Investigating the rate of photosynthesis

Answer 21

Use pondweed that release bubbles of oxygen which is visible under water count and record the number of bubbles released per minute as indication of rate
Another variation is to collect and measure the volume of oxygen released use an inverters graduated measuring cylinder or a syringe to collect bubbles

Question 22

The effect of changing light intensity

Answer 22

Independent variable is light intensity which is changed by moving a light source

Dependent variable is the number of bubbles

Control variable is temperature, concentration of carbon dioxide pondweed

Question 23

Changing of light intensity

Answer 23

Make sure water is well aerated and plant illuminated before setting up apparatus

Cut stem cleanly before placing in beaker to observe bubbles released

In lace the lamp a set distance from pondweed and allow to acclimate before counting

Set up as before and count the number of bubbles at each temperature

Repeat count three times and record results

Move the lamp closer and repeat procedure

Question 24

The effect of changing temperatures

Answer 24

Independent variable is temperature which is changed by increasing temperature of hot plate or water bath

Dependent variable number of bubbles produce

Control variables ; light intensity , concentration of carbon dioxide and pondweed

Set up as before and count the number of bubbles at each temperature

Question 25

The effects of changing carbon dioxide concentration

Answer 25

Independent variable is carbon dioxide concentration which is changed by dissolving different amounts of NaHCO3 Dependent number of bubbles produced Control variables: Light temperature and pindweed Count the number of bubbles of each production of concentration

Question 26

Plants structure to adapt to maximize photosynthesis

Answer 26

Large surface area Thin

Question 27

Plants structure to adapt to maximize photosynthesis

Answer 27

Large surface area Thin

Question 28

Leaders structure

Answer 28

1) higher concentration of carbon dioxide in atmosphere compared to inside of the leaves 2)co3 diffuses into lead through open stoma into air space on spongy meeophyll 3) co2 diffuses through cell wall and cell membrane of mesophyl cell dissolves in cytoplasm and diffuses into chloroplasts

Question 29

What does a leaf being thin do

Answer 29

Allows gasss to diffuse quickly

Question 30

The leaf contains these

Answer 30

Chloroplast Cuticle Guard cells Stomata Upper and lower epidermis Palisade mesophyll Spongy mesophyll Air spaces Vascular bundles containging xylem And phloem