Q2 Photosynthesis

Question 1

Chemical formula of photosynthesis

Answer 1

6CO2 + 6H20 ⤳ C6H12O6 + 6O2

Question 2

Where does light reaction occur?

Answer 2

Thylakoid Membrane

Question 3

Where does Calvin Cycle occur?

Answer 3

Stroma

Question 4

A part of the chemical formula of photosynthesis:

Split during the light reactions to replace electrons lost from Photosystem II

Answer 4

6H20

Question 5

A part of the chemical formula of photosynthesis:

Provides the carbon to produce organic compounds during the Calvin Cycle

Answer 5

6CO2

Question 6

A part of the chemical formula of photosynthesis:

Produced as a byproduct of the splitting of water during the light reactions

Answer 6

6O2

Question 7

A part of the chemical formula of photosynthesis:

The organic compound ultimately produced during the Calvin Cycle

Answer 7

C6H12O6

Question 8

2 Phases of Photosynthesis

Answer 8

1.) The Light Reactions (or Light-Dependent Reactions)

2.) The Calvin Cycle (or Calvin-Benson Cycle or Dark Reactions or Light-Independent Reactions)

Question 9

Which Phase of Photosynthesis is this?

Capture the energy in sunlight and convert it to chemical energy in the form of ATP and NADPH using photosystems, electron transport chains and chemiosmosis.

Answer 9

The Light Reaction Phase

Question 10

Names of the protein chain/electron chain

____________ - Pq
____________ - Cyt
____________ - Pc
____________ – Fd

Answer 10

1.) Plastoquinone
2.) Cytochrome complex
3.) Plastocyanin
4.) Ferredoxin

Question 11

Stages of Light Reaction
1. L______________
2. O______________
3. E______________
4. C______________

Answer 11

1. Light absorption
2. Oxygen production
3. Electron transport
4. Chemiosmotic ATP synthesis

Question 12

Stage of Light Reaction

A process by which light is absorbed by chlorophyll that will excite its electrons.

Answer 12

Light absorption

Question 13

Stage of Light Reaction

When water is split oxygen ,H ion, and electrons will be produced.

Answer 13

Oxygen production

Question 14

Stage of Light Reaction

The movement of excited electrons through a series of proteins/chains to build a proton/ H ion gradient.

Answer 14

Electron transport

Question 15

Stage of Light Reaction

The process that produces ATP by enzyme ATP synthase because of the difference in the electrochemical gradient across the thylakoid membrane.

Answer 15

Chemiosmosis

Question 16

Which Phase of Photosynthesis is this?

A process wherein chemical energy (from the light reactions – ATP and NADPH) and CO2 (from the atmosphere) are used to produce organic compounds (like glucose).

Answer 16

Calvin cycle

Question 17

Phases of Calvin Cycle
1. C___________
2. R___________
3. R___________

Answer 17

1. Carbon Fixation
2. Reduction
3. Regeneration of RuBP

Question 18

Which phase of the Calvin Cycle is being tackled below?

This is the process of assimilating carbon from a non-organic compound (CO2) and incorporating it into an organic compound (carbohydrates).

Answer 18

Carbon Fixation

Question 19

In Carbon Fixation, ____________ (from the atmosphere) are joined to ___________ (a 5-carbon sugar) by Rubisco (an enzyme also known as RuBP carboxylase)

Answer 19

1.) 3 molecules of CO2
2.) 3 molecules of RuBP

Question 20

In Carbon Fixation…

CO2 ➜ RuBP⤳___________
(Rubisco is the bold arrow)

Answer 20

3-PGA

Question 21

In Carbon Fixation…

6 ATP ➜ _______
and there will be _____ carbon

Answer 21

1.) 6 ADP
2.) 18 Carbon

Question 22

Which phase of Calvin cycle is this?

In this phase the 3-PGA molecules created through carbon fixation are converted into molecules of simple sugar – glucose.

Answer 22

Reduction

Question 23

First step of reduction in Calvin cycle

1. The 6-carbon molecules are _________ by ________.

Answer 23

1. The 6-carbon molecules are reduced by gaining electrons from NADPH.

Question 24

The second step of reduction in the Calvin cycle

2. Molecular _________ with the use of ATP. The three 6-c_______ molecules will ________, forming ____________.

Answer 24

2. Molecular rearranging with the use of ATP. The three 6-carbon molecules will split in half, forming six 3-carbon molecules.

Question 25

The third step of reduction in the Calvin cycle

3. One of these “extra” 3-carbon G3P/PGAL molecules will ______ the cycle and be used to form ____________

Answer 25

3. One of these “extra” 3-carbon G3P/PGAL molecules will exit the cycle and be used to form ½ a glucose molecule.

Question 26

Once the Calvin Cycle “turns” twice (well, actually 6 times), those 2 m_______________ (a 3-carbon carbohydrate) will combine to form 1 molecule of ___________ (a 6-carbon carbohydrate molecule) OR another organic compound.

Answer 26

Once the Calvin Cycle “turns” twice (well, actually 6 times), those 2 molecules of G3P (a 3-carbon carbohydrate) will combine to form 1 molecule of glucose (a 6-carbon carbohydrate molecule) OR another organic compound.

Question 27

Which phase of Calvin cycle is this?

The remaining 5 G3P molecules (3-carbons each!) get rearranged (using ATP) to form 3 RuBP molecules (5-carbons each).

Answer 27

Regeneration of RuBP

Question 28

In calvin cycle,

REACTANTS: C________, A________, and N________

PRODUCTS: G________ and G________

Answer 28

REACTANTS: Carbon dioxide, ATP, and NADPH

PRODUCTS: Glucose and G3P

Question 29

In Light Reaction,

REACTANTS: S______

PRODUCTS: A______, N______, O______

Answer 29

REACTANTS: Solar Energy (photons)

PRODUCTS: ATP, NADPH, Oxygen