Ib bio 2.9

Question 1

what colour of light does chlorophyll absorb and reflect?

Answer 1

-absorbas red and blue
-reflects green

Question 2

What are the functions of O2 in photosynthesis?

Answer 2

-photolosysis in photsystem 11 for electron

Question 3

Effects of photosynthesis on the earth?

Answer 3

-changes to the earths atmosphere, oceans, and rock disposition
-rise in the O2 conc in atmosphere(release in photosynthesis)
-great oxidation event
-glaciation due to greenhouse effect
-decrease of CO2. Conc
-oxidation from O2 conc in oceans cuased dissolved iron in water to fall onto the sea bed rock formation was produced

Question 4

Limiting factors

Answer 4

• temp
  -co2 conc
  -light intensity

Question 5

What will low light limit in photosynthesis?

Answer 5

-ATP and NADPH
-in Calvin cycle when we need ATP + NADPH to convert glycerin-3-phosphate into triose phosphate

Question 6

What will the CO2 conc limit in photosynthesis?

Answer 6

-Carbon fixation will be limited cuz g3p will be limited production
-as a result have atp and NADPH accumulating

Question 7

What will the temp limit in photosynethsis?

Answer 7

-Calvin cycle
- when carbon being fixed (when rubisco use)
-low= reactions wont happen enough
-high= denature the enzyme

Question 8

What is the diff between light dependent and independent reactions?

Answer 8

-takes place in intermebnrane of thylakoid in stoma
-Ind: takes place in dark for phew seconds cuz has energy from photosystems
-dep: generate ATP and NADPH for ind reaction

Question 9

Blue light nanometers

Answer 9

450-500

Question 10

Green nanomètres

Answer 10

525-575

Question 11

Red nanometers

Answer 11

650-700

Question 12

Do shorter wavelengths contain more or less energy?

Answer 12

Higher energy

Question 13

Longer wavelengths contain… energy

Answer 13

Lower energy

Question 14

Absorption vs action spectra

Answer 14

Absorption: shows % of light absorbed at each wavelength by pigment
Action: graphs shows rate of photosynthesis at each wavelength of light

Question 15

Is the production of carbs exo or en do

Answer 15

Exothermic

Question 16

Photon gradient

Answer 16

-PS11
-as electron pass in ETC, energy is released and used to pump protons across thylakoid membrane into space and inside thylakoid

Question 17

What does CEPS stand for in a basic leaf structure

Answer 17

C-cuticle
E-epidermis
P-palisade mesophyll
S-spongy mesophyll

Question 18

What do the “viens” or vesicular tissue contain in a plant?

Answer 18

-phloem
-xylem

Question 19

Explain the process of transpiration

Answer 19

-where water travels from root to leaves and excites through stomata as water vapour
-xylem carries water to various parts of plant, which is needed for photosynthesis
-carries other small minerals along w water
-water lost on leaves through evaporation that needs to be replaced by roots

Question 20

How much h20 taken in by roots is lost as transpiration?

Answer 20

90%

Question 21

What is a function that transpiration helps the plant?

Answer 21

-cooling down the plant when h20 evaporates from stomata (just like sweating)

Question 22

Where does the water in transpiration evaporate from?

Answer 22

The stomata

Question 23

What does the loss of water in transpiration result in?

Answer 23

-negative pressure and a pull on water from xylem

Question 24

What are the H+ ions used for in photosystems?

Answer 24

-to be a co-transporter for sucrose to move across cell
-for the NADPH (reduced NADP)

Question 25

In plants are there a higher conc of H+ ions in or out of the cell? Why?

Answer 25

-outside the cell
-accumulate from splitting of water (photolysis), originally for electron replacement (non-cyclic phototphosporalytion)