Homeostasis and Plant Hormones
- Created by: isabella newsum
- Created on: 15-11-14 18:00
View mindmap
- Plant Hormones and Homeostasis
- Auxin
- Controls growth near the tips of shoots (phototropsim- response to light) and roots (gravitropism- gravity)
- Shoots grow towards light- more auxin accumulates on the side in the shade, makes cell elongate faster on shaded side- bends towards the light
- Shoots grow away from gravity- gravity produces an unequal distrubution with more auxin on the lower side, causes lower side to grow faster, bending shoot upwards
- Roots grow towards gravity- more auxin on lower side, extra auxin inhibits growth , cells on top elongate faster, root bends downwards
- Roots grow towards moisture- produces more auxin on the side with more moisture, inhibits the growth on that side, causing root to bend towards the moisture
- Slective weedkillers are made of plant growth hormones- disrupt normal growth patterns which soon kills them
- Plant cuttings- add rooting powder, produce roots rapidly, new plants- lots of clones
- Homeostasis
- Ion Content
- Regulated by Kidneys
- Taken in by food
- Toom much, excess ions need to be removed
- Regulated by Kidneys
- Lost by sweat
- Water Content
- Taken in by food and drink
- Lost through a) skin as sweat b) lungs in breath c) kidneys as urine
- Cold day- not exercising- no sweat, more urine- pale (diluted)
- Hot day- exercising- sweat a lot, less urine- more concentrated
- Body Temp.
- Enzymes in body work best at 27 degress
- Part of brain recieves messages from the skin that provide info about skin temperature
- Blood Sugar Levels
- Foods containing carbs puts glucose into the blood from the gut
- Lots of vigorous exercise, lots of glucose removed
- Hormone Insulin maintains right level of glucose in the blood
- Foods containing carbs puts glucose into the blood from the gut
- Ion Content
- Auxin
Comments
No comments have yet been made