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BIOLOGY > 13.10 a Survival and response > Flashcards

13.10 a Survival and response Flashcards

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1
Q

Simple reaction pathway

A

Stimulus
Receptor
Coordinator
Effector
Response

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2
Q

Why do organisms need to respond to changes in their environment?

A

_ Avoid harm
- Keep in favourable conditions
- Grow towards/away from stimuli

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3
Q

Kineses

A

Random movement in response to a stimuli

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4
Q

Taxes

A

Directional movement of an organism either towards or away from a stimulus

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5
Q

Positive taxis

A

Towards the stimulus

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6
Q

Negative taxis

A

Away from the stimulus

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7
Q

Why do we need reflex actions?

A
  • To protect us against damage to body tissue
  • help escape from predators
  • Enable homeostatic control
  • Find food, mates or suitable living conditions
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8
Q

Receptor example

A
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9
Q

Sensory neurone

A

Connects nerve impulse to relay neurone

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10
Q

Relay neurone

A

Goes between senspory neurone and motor neurone

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11
Q

Effector

A
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12
Q

What are the advantages of simple reflex arcs

A
  • Rapid
  • Protects against damage to the body tissue
  • Dont have to be learnt
  • Helps escape predators
  • Enables homeostatic control
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13
Q

Positive tropism

A

Grows towards the stimulus

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14
Q

Negative tropism

A

Grows away from the stimulus

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15
Q

Gravity tropism term

A

Geo

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16
Q

Salt tropism term

A

Halo

17
Q

Light tropism term

A

Photo

18
Q

Water tropism term

A

Hydro

19
Q

Explain IAA as a plant growth factor

A
  • IAA is produced in the tips of the roots and shoots
  • Diffuses to the growing region
  • Causes cell elongation in shoots
    Inhibits cell elongation in roots
  • IAA transported to the more shaded part of the roots or shoots in phototropism
  • IAA moves to the underside of the roots and shoots in geotropism
20
Q

Explain IAA in shoots

A
  • IAA is synthesised in the shoot tips
  • IAA diffuses into the growing region
  • Light causes the movement of IAA from the light side to the shaded side
  • Higher concentration of IAA on the shaded side
  • Causes directional growth as there is a greater cell elongation on shaded side
  • Shaded side grows faster and causes shoot to bend towards light
21
Q

Explain IAA in the roots

A
  • IAA synthesised in the root tips
  • IAA diffuses into the growing region
  • Light causes the movement of IAA from the light side to the shaded side, towards gravity
  • Higher concentration of IAA on the shaded side
  • Cell elongation inhibited on the shaded side
  • Results in directional growth away from light and towards gravity

BIOLOGY (23 decks)

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