Unit 5 questions

Question 1

What is photosynthesis?

Answer 1

Process by which green plants use sunlight to synthesise nutrients from CO2 and H2O. O2 is generated as a by-product.

Question 2

Site of photosynthesis

Answer 2

Occurs in the chloroplasts

Question 3

Adaptations of the leaf for photosynthesis

Answer 3

Large surface area
Thin
Transparent cuticle and epidermis
Long
Numerous photo sensitive stomata
Network of xylem and phloem

Question 4

Equation for photosynthesis

Answer 4

6CO2 + 6H2O —-> C6H12O6 + 6O2

Question 5

Grana

Answer 5

Stacks of thylakoids, location of light dependent reaction.

Question 6

Stroma

Answer 6

Fluid filled matrix where light independent reactions occurs.

Question 7

Light dependent reaction

Answer 7

Process by which an inorganic phosphate is added to ADP making ATP. Water is also split by photolysis.

Question 8

What does the light absorbed by the thylakoids in the chloroplast due to a pair of electrons?

Answer 8

They increase in energy level, meaning it can leave the chloroplast via an electron carrier. It then travels down an electron transport chain by a series of redox reactions. It loses energy of the way, which is used to make ATP molecules.

Question 9

How can ATP be produced during the light dependent reaction?

Answer 9

H+ions pass through ATP synthase channelsin the thylakoids membrane which cause changes to the structure of the enzyme which then catalysed the reaction to make ATP. The H+ ions are able to enter the thylakoids due to energy from the photolysis of water, this also creates a concentration gradient from the Stroma to the Grana.