photosynthesis

Question 1

What is photosynthesis?

Answer 1

produces glucose for respiration in plants

Question 2

is photosynthesis endothermic or exothermic?

Answer 2

endothermic

Question 3

do the word equation for photosynthesis?

Answer 3

carbon dioxide + water –> glucose + oxygen

Question 4

what do you need to do photosynthesis?

Answer 4

chlorophyll

Question 5

why are leaves large?

Answer 5

the surface area is bigger for photosynthesis

Question 6

what organ is specialised for photosynthesis?

Answer 6

A LEAF
–> it’s large for a wider surface area
–> each part is specialised

Question 7

what does the waxy cuticle do?

Answer 7

reduces water loss by evaporation

Question 8

where is the upper epidermis?
(think: upper -at the top epidermis - dermis means SKIN)

Answer 8

it is at the top - it is transparent so light can pass through to the palisade layer where photosynthesis happens

Question 9

what does the stomata do? what is it?

Answer 9

• tiny holes in the leaf
• allows carbon dioxide in for photosynthesis
• lets water out for transpiration

Question 10

what is a vascular bundle?

Answer 10

xylem and phloem

Question 11

what does a guard cell do?

Answer 11

opens and closes the stomata

Gas Exchange: Stomata allow gases (such as carbon dioxide and oxygen) to enter and exit the leaf. Guard cells control the opening and closing of stomatal pores. When water moves into the guard cells (via osmosis), they become turgid, causing the stomata to open. This allows gases to diffuse in and out of the leaf. Conversely, when guard cells lose water and become flaccid, stomata close, preventing further gas exchange
Water Regulation: By adjusting stomatal opening, guard cells regulate water loss through transpiration. When the guard cells lose water, stomata close, minimizing water vapor escape from the leaf. This mechanism helps conserve water during dry conditions - bing ai

Question 12

what is a limiting factor?

Answer 12

something that slows the rate of photosynthesis if there isn’t enough of it

Question 13

what are the limiting factors?

Answer 13

-LIGHT INTENSITY
- CO2 CONCENTRATION
- TEMPERATURE

Question 14

Explain why light intensity is a limiting factor.

Answer 14

light is needed for photosynthesis as it is the light energy converted into chemical energy
- eventually though adding more light won’t increase the rate of photosynthesis

Question 15

Explain why temperature is a limiting factor.

Answer 15

• it impacts the enzymes involved
• TOO HOT - denature
• TOO COLD - the enzymes are too slow
  —> optimum temp.

Question 16

Explain why carbon dioxide concentration is a limiting factor.

Answer 16

• it is a reactant in photosynthesis
• not much of the air is CO2 so it is can be short supply
• the graph increases but then plateaus - there is a limit to how much a plant needs