Animals in Space

• Taxes - Rapid Movements - DIRECTIONAL

  Kinesis - Non - DIrectional - response to Stimulus
• In taxes , Stimulus direction determines direction of Movement
• Taxes Responses includes

  Chemotaxis - Chemical

  Geotaxis - Gravity

  Thermo - Temp

  Photo - Light

  Hydro - Water

  Rheo - Current
• Kinesis is a non- directional movemnet response to stimulus
• In kinesis, the intensity of stimulus determines the rate of movements - Direction is Random - no relation to stimulus direction
• Two Types of Kinesis

  Orthokinesis - Rate of Movement - II II = Increase chance of finding favourable condition

  Klinokinesis = Rate of Turning - Faster in unfavourable condition while slower in Fav. Condition
• Adaptive Advantage (E)

  Tropism - Moves organism into FAVOURABLE contiditions

  Plants growing towards light - Maximises Photosynthesis for Growth

  Slaters moving into damp conditions +Hydro - reduce dehydration

  Nasty

  Opening Primrose at night - (Photonastic) -Attracts night active pollinating moths
• Homing is a response when animal returns regularly to their nest site
• In homing, the animal must be able to navigate and Requires Internal Clock
• Migration is response in which members of species move from one geographical area - to a geographically Isolated location
• Migration usually occur as an annual evens

  Migrate between Feeding and Breeding grounds
• Migration can be from different part of the country / world

  Depends on Seasonal Changes
• Return Migration are commnly on birds .

  Occur in different life cycle

  e.g - Eels breed in sea and Migrate back to rivers

  Salmin breed in rivers migrate back to sea - some dies
• Both Homing and Migration requires

  Ability to Navigate and to have an Internal Clock