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The best biology notes for A - level biology : Topic 6 £5.96   Add to cart
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The best biology notes for A - level biology : Topic 6
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These notes have taken students from grades D- A* All by learning the following notes. These notes are absolutely necessary for A* wannabes. All slides cover every topic on the AQA specification. Students are simply required to learn the content, and the highlighted information to secure thei...

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  • June 22, 2024
  • 25
  • 2023/2024
  • Lecture notes
  • Whitlock
  • Paper 2

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Stimuli
even single celled
Organisms are more
likely to
Survive if they can respond to organisms can respond
to simple Stimuli
changes in environment
leg . more towards
↳ can be
changes certain chemicals)
in both internal
external environment


in the environment is stimulus
Any change a




Simple responses can be tactic (taxis) or Kinetic /Kinesis)


-


V
S E
directional non-directional
movement movement
(direction of stimulus (random movement .




impacts response) moves fast when

in place the

:
-
:
doesn't
-
organism
-




-
·

-
... -
↑



want' to bet
-

->

more/less in
eg . Some
species of moves

bacteria more towards response to a stimulus
certain chemicals
↑ TXx
(chemotaxis) -
.......
D
-




...

↓
It ↓

bacteria
.
eg can

more
quickly in
random directions when
too hot in search for
Stimuli are
,



a cooler area
detected by receptors

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