9. Photosynthesis Flashcards

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1
Q

Def. of photosynthesis

A

The way in which plants make their food using light energy

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2
Q

Photosynthesis equation

A

6CO2 + 6H2O —–Light+Chlorophyl—> C6H12O6 +6O2

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3
Q

Role of photosynthesis

A

Source of O2 for living things
Makes food for plants
Makes food for animals

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4
Q

Where photosynthesis takes place

A

Chloroplast

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5
Q

Name stage 1

A

Light dependent stage

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6
Q

Where does stage 1 happen

A

Granium of the chloroplast

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7
Q

Products of stage 1

A

ATP, NADPH, O2

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8
Q

Fate of products from stage 1

A

ATP- used in dark stage to provide energy to reduce H+, e- and CO2 to form glucose

NADPH- Provides H+ and e- to reduce CO2

O2- released as gas (wasted) or used in respiration

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9
Q

Photolysis

  • means
  • what
  • where
  • how
A
  • means: photo=light, lysis= burst
  • what: water splitting in light dependent stage
  • where: In the chloroplast of the leaf
  • how: energy from the sun
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10
Q

What is the reaction centre chlorophyll

A

Is the molecule that specifically absorbs the light energy

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11
Q

Sources of things needed for photosynthesis

CO2, H2O, Light

A

CO2- air, respiration, burning fossil fuels
H2O- absorbed through roots from soil
Light- Sunshine

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12
Q

What is chlorophyll

A

Green pigment in leaf used to absorb light energy

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13
Q

Name stage 2

A

Light independent stage / dark stage/ Calvin cycle

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14
Q

Where does stage 2 happen

A

Stroma of chloroplast

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15
Q

Products of second stage

A

Glucose (C6 H12 O6)
ADP
NADP

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16
Q

Fate of products from stage 2

A

Glucose (C6 H12 O6)- glucose used as food/ used in respiration/ stored as starch
ADP- will go back to stage 1 to be phosphorylated
NADP- will go back to stage 1 to gain H+ and e-

17
Q

Describe process in stage 1

Start

A

Light energy absorbed by chlorophyll in chloroplast.
Electrons become energised and leave chlorophyll in pairs.
Picked up by 2 pathways.
Pathway 1
Pathway 2

18
Q

Describe Pathway 1 in stage 1

Name and what happens

A

Pathway 1: Cyclic photo phosphorylation
Electrons picked up by electron acceptor which passes them into a carrier system, C1-C2-C3, releases energy at each stage which is used to make ATP

19
Q

Describe pathway 2 (stage 1)

Name and what happens

A

Pathway 2: Non cyclic photo phosphorylation
The 2 electrons join with the NADP+ to make NADP-
A water molecule splits to make H+, e-, O2
The H+ joins with the NADP- to form NADPH
The electron passes into a carrier system releasing energy to form ATP and returns to the chlorophyll (reaction centre)

20
Q

Describe Stage 2

A

NADPH releases electron(e-) and hydrogen molecule (H+)
An ATP from stage 1 is carried over and loses a phosphate and releases energy (ATP=ADP+ P)
The e- and H+ reduces the CO2 with energy from the ATP and forms glucose