photosynthesis

Question 1

What is the word equation for photosynthesis

Answer 1

Carbon Dioxide + Water –> Glucose +Oxygen

Question 2

Why is photosynthesis important

Answer 2

It provides energy for the plant by converting light energy to chemical energy

Question 3

Mineral ions

Answer 3

Enter through root hair cells using active transport
Nitrates for amino acids
Magnesium needed for chlorophyll

Question 4

Temperature effect on photosynthesis

Answer 4

Higher temp= higher rate of photosynthesis until optimum temperature at 37 degrees then goes down

Question 5

Carbon dioxide and light intensity effect on photosynthesis

Answer 5

Higher co2/light intensity, higher rate of photosynthesis till limiting factor isnt co2/light intensity

Question 6

Adaptations of a leaf for gas exchange

Answer 6

Thin- short diffusion pathway
Stomata- diffuse oxygen and carbon dioxide easily
Air holes inside leaf increases sa and let more air pass through

Question 7

Role of stomata

Answer 7

Let gases diffuse out and in
Close at night as photosynthesis doesn’t occcur
Close to stop water escaping to stop pont drying up
Controlled by guard cells who open and close the stomata

Question 8

Role of phloem

Answer 8

Transports sucrose and amino acids in the plant

Question 9

Role of xylem

Answer 9

transports water and mineral ions from roots to other parts

Question 10

how is water absorbed by root hair cells

Answer 10

Osmosis

Question 11

What is transpiration

Answer 11

Loss of water from plant

Question 12

What is the rate of transpiration affected by and how

Answer 12

1) light intensity: high light intensity = high transpiration (because stomata close in dark)
2) temperature: warmer-faster transpiration (more evaporation)

3) wind speed: high wind speed= transpiration( creates constant concentration gradient)
4) humidity: high humidity= low transpiration (no concentration gradient)

Question 13

Adaptations of a leaf for photosynthesis

Answer 13

1) broad so large SA exposed to light 2) contain chloroplasts, found in the palisade layer (near the top where they get most light)
3) transparent upper epidermis so light can pass through
4) network of vascular bundles which deliver water and nutrients and take away glucose 6) stomata + adaptations for gas exchange
produced by photosynthesis 5) waxy cuticle prevents water loss

Question 14

Root hair adaptations

Answer 14

shape: (long “hair” sticking out) gives larger surface area
No chloroplasts needed
Lots of mitochondria for active transport

Question 15

Chemical equation for photosynthesis

Answer 15

6H2O + 6CO2 —> C6H12O6 + 6O2

Question 16

Diffusion role in gas exchange

Answer 16

Allows gases to escape and to get in for photosynthesis

Question 17

Day and night plant

Answer 17

Respiration continues as constantly needed
Photosynthesis only happens at night
Gas exchange rate depends on intensity of light