Lab 7,9

Question 1

the membrane is selectively permeable because?

Answer 1

it allows only certain molecules to cross freely

Question 2

diffusion

Answer 2

the net movement of molecules from a region of higher concentration to a region of lower concentration

Question 3

osmosis

Answer 3

the diffusion of water across a deferentially permeable membrane from an area of higher water concentration to an area of lower water concentration

Question 4

solution

Answer 4

contains both a solute (particles) and a solvent (liquid) that dissolves the solute

Question 5

tonicity

Answer 5

the relative concentration of solute and solvent outside of a cell compared to inside the cell

Question 6

which substance crosses membrane? iki or starch

Answer 6

Iki - blue

Question 7

how would you know if a potato core gained water?

Answer 7

it would be harder and have a more dense feel to it

Question 8

overall equation for photosynthesis

Answer 8

CO2 + H2O –(solar energy)–> C6H12O6 + O2 + H2O

Question 9

Where does photosynthesis takes place>

Answer 9

Chloroplast

Question 10

Chloroplast

Answer 10

where plant pigments absorbs solar energy

Question 11

the principal pigment in advanced plants is?

Answer 11

chlorophyll (chl a and chl b)

Question 12

Describe how chlorophyll absorb energy

Answer 12

they absorb energy in the red and blue portions of the elctromagnetic spectrum and reflects green wavelengths

Question 13

what is the point of accessory pigment

Answer 13

to maximize the amount of light energy absorbed

Question 14

Carotenoids and xanthophylls

Answer 14

• orange and yellow pigments

- two common accessory pigments in green plants

Question 15

chromatography

Answer 15

a technique that separates molecules from each other on the basis of their solubility (ability to dissolve) in particular solvents
- allow qualitative determination of the presence of accessory pigments in green leaves

Question 16

leaf experiment pigment from most soluble to least soluble

Answer 16

Chlorophyl b, a, xanthophyll, carotenes

Question 17

the three major groups of producer organisms

autotrophs

Answer 17

plants
cyanobacteria
algae

Question 18

respirometer

Answer 18

device for measuring the amount of gas given off and or consumed

Question 19

What gas is produced during photosynthesis? during fermentation?

Answer 19

Oxygen, Carbon dioxide

Question 20

Describe Experiment 7 activity 1

Answer 20

dialysis bag all solute with glucose and starch diffused into a beaker containing H2O and IKI
- The IKI from the beaker diffused into the bag and interacted with the starch to turn the dialysis bag into blue, which meant that the glucose diffused into the beaker from the bag. When boiled for 10 min, the color turned orange proving positive for glucose.

Question 21

Describe lab 7 activity 2 - osmotic response of cell

potato core in solution of salts in 0, 1, 2, 4%

Answer 21

the one in no solution of salt absorbed more water which means that the solution is hypotonic to the potato

• it lost weight on 1 2, 4, which means that the solution is hypertonic to the core
• isotonic is where it reaches at 0

Question 22

plasmolysis vs crenation

Answer 22

plasmolysis occurs on plant cells with cell walls
- the cell wall doesnt shrink, only the plasma membrane does
Crenation is for cells that does not have cell walls
- the whole cell shrinks

Question 23

Describe Lap 9

Answer 23

paper chromatography to note the occurrence of different pigments in green plants, quantitatively determine the effect of increasing light intensity on photosynthetic rate, and observe a demonstration of the uptake of carbon dioxide gas by an aquatic producer (elodea)

Question 24

lab equipment used in lab 9

Answer 24

manometer tubes with test tubes
dropper bottle of sodium bicarbonate (20 drops each tube)
two write clamps
elodea with water and sodium bicarb in one - other is just water with bicarbonate
and light

Question 25

which are the essential pigments

Answer 25

chlorophyll a and b

Question 26

which are the accessory pigments

Answer 26

orange and yellow, carotenes and xanthophylls

Question 27

Carbon dioxide fixation

- during the 2nd stage of photosynthesis, the plants takes up?

Answer 27

CO2 and reduces it to a carbohydrates, such as glucose C6H12O6.
- the CO2 should disappear around elodea as photosynthesis happens

Question 28

Phenol red

Answer 28

a ph indicator that turns yellow in an acid and red in a base
- when carbon dioxide combines with water, it forms carbonic acid

Question 29

Activity 3 Carbon dioxide fixation

Answer 29

The start solution is phenol red with elodea and just phenol red. The solution is blue acid, as air is introduced (CO2) color changes to green, turns more towards base. As the elodea photosynthesis the CO2, it introduces Oxygen to level off the pH level of the solution and turn it back to acid.

Question 30

Passage of molecules into and out of cells is regulated by?

Answer 30

plasma (cell) membrane