Light Reaction

Question 1

photosynthesis purpose

Answer 1

use energy from light to convert inorganic compounds into organic fuels that have stored potential energy in their carbon bonds

Question 2

autotrophs + what they require

Answer 2

organisms that obtain energy without needing to ingest other organisms, require the input of inorganic substanecs from the environment

Question 3

photoautotroph

Answer 3

photosynthetic plants - autotroph that gets energy from light

Question 4

chemoautotroph

Answer 4

uses chemical inorganic substances to gain energy

Question 5

what type of light drives photosynthesis

Answer 5

visible light

Question 6

pigment

Answer 6

group of light absorbing molecules

Question 7

chlorophyll

Answer 7

pigment in green plants

Question 8

2 steps of photosynthesis

Answer 8

light reactions, calvin cycle

Question 9

what are the 3 main parts to light reactions?

Answer 9

• photo excitation & photolysis
• electron transport
• photophosphorylation (chemiosmosis)

Question 10

photo excitation and photolysis

Answer 10

absorption of light photons whose energy excites an electron that is trapped by an electron acceptor, the energy is also used to split water releasing electrons

Question 11

electron transport in photosynthesis

Answer 11

harnessing the energy in electrons to form an electrochemical gradient

Question 12

photophosphorylation (chemiosmosis)

Answer 12

ATP synthesis due to electrochemical gradient and the proton motive force

Question 13

photosystem

Answer 13

a cluster of pigments embedded in the transmembrane proteins of the thylakoid membrane

• reaction centre that contains a chlorophyll that is located next to a primary electron acceptor

Question 14

photophosphorylation

Answer 14

light dependent formation of ATP by chemiosmosis