Growth And Development

Question 1

What is light saturation?

Answer 1

• plants only have a limited capacity to absorb light(light saturation) this response is the light saturation curve, light saturation is the maximum amount of light the plant can use

Question 2

Difference between c3 and c4 plants

Answer 2

• c4 is pants utilise light better at higher temperatures

- c3 plants utilise light better at lower temperatures

Question 3

What are the effects of CO2 increase on light utilisation?

Answer 3

The optimum levels of sunlight needed increase with heightened levels of CO2

Question 4

What is the radiation-use efficiency equation?

Answer 4

Growth rate(biomass)= incident radianceXcrop cover(%)X radiation-use efficiency

Question 5

1g glucose =?

Answer 5

• 0.83g (CH2O)

- 0.38g protein

Question 6

How is light measured?

Answer 6

Subjective measurements: lumens, candles, lux

Physical measurements: energy or quantum

Question 7

What is light interception?

Answer 7

As the number and size of leaves in the canopy increases, the amount of light that is intercepted goes up

Question 8

What is LAI (leaf area index?)

Answer 8

LAI is the area of leaf cover per area of ground

Question 9

What are the three path ways water can go when used on a crop?

Answer 9

• absorption by roots
• evaporation
• percolation through soil

Question 10

What is evapotranspiration?

Answer 10

The amount of water that gets lost from the soil moisture reserves over a set period

Question 11

What are the nutrient types?

Answer 11

Macro and micro