photosynthesis

Question 1

leaf adaptations for photosynthesis (7)

Answer 1

• waxy cuticle - water loss prevented but light travels through
• gas exchange in spongy mesophyll - quicker in air
• guard cels control transpiration
• phloem transports glucose + xylem brings water from roots
• thin - short diffusion pathway
• palisade cells near top surface to maximise light exposure + contain chloroplasts
• big SA:V for max light exposure

Question 2

6 mark answer for how LIR occurs

Answer 2

• CO2 combines with RuBP in a reaction catalysed bu Rubisco
• producing 2 molecules of glycerate-3, phosphate
• glycerate-3, phosphate is reduced to triose phosphate, using NADP and ATP
• 1 triose phosphate converted to other organic substances
• 1 converted back into RuBP using ATP

Question 3

photosynthesis

Answer 3

the process by which plants produce glucose from water + CO2 in a reaction catalysed by light

Question 4

where does LDR occur

Answer 4

thylakoid membranes (in grana)

Question 5

where does LIR occur

Answer 5

stroma