Flashcards in Topic 6 Deck (17):
Carbon dioxide + water ———-> glucose + oxygen
Is photosynthesis endothermic of exothermic?
Light intensity equation
Light intensity = 1/distance2
Light graph for photosynthesis?
Goes up an plateaus as another factor such as CO2 orTemp needs to be increased.
Temp graph for photosynthesis?
Goes up steadily and then drops rapidly as enzyme denatures (about 45 degrees)
CO2 graph for photosynthesis?
Similar to light, goes up then plateus as temp is limiting factor.
What does the phloem transport, and what is the process called and where does it go?
Food substances eg sucrose, through translocation and it goes in both direction.
What does the xylem transport, and what is the process called and where does it go?
They carry water and mineral ions from the roots to stem and leaves. Called transpiration.
The loss of water from a plant
What are Stomata?
Tiny pores on the surface of a plant that allow CO2 and oxygen to diffuse in and out of a leaf
Why do cacti have spines instead of leaves?
To reduce SA for water loss by evaporation.
What is a plant’s growth hormone called, and where is it produced?
Auxin. It is produced in tips and promotes growth in the shoot.
What is phototrophism?
Growth responses of plants to light
What is gravitropism?
Growth responses of plants to gravity
What happens when a plant shoot is exposed to light?
It accumulates more auxins on the side in the shade, so the cells elongate faster on the shaded side, so the shoot bends towards the light.
Are shoots positively or negatively phototrophic, and positively or negatively gravitropic?
Positively phototrophic, negatively gravitrophic.