SURVIVAL AND RESPONSE

Question 1

Stimulus

Answer 1

Detectable change in environment

Question 2

Pathway

Answer 2

Stimulus- receptor- coordinator - effector - respose

Question 3

Kinises

Answer 3

Random movement away from stimulus
Not directional
Adaptiev response

Question 4

Why do organisms need to respond to change in the environment?

Answer 4

keep in a favorable environment
Grow away from stimulus
Dispersing to find new mates
Avoiding harmful environments , competition and predetors

Question 5

Tropoism

Answer 5

Direction of growth towards or away from stimulus

Question 6

Behavior patterns

Answer 6

Genetically inhertied
Instintive behaviour is an innate response to stimuli

Question 7

Reflax action meaning

Answer 7

Behaviour a certain produces a specific short lived response

Question 8

Advantages of reflax action

Answer 8

Rapid
Protects against damages of tissues
Not learnt
Helps escaoe predetors
Enable homeostatic control

Question 9

Where is IAA produced

Answer 9

In tips of roots and shoots

Question 10

IAA in shoots

Answer 10

IAA synthesised
Diffuses into growing region
Light causes movement of IAA from light to shaded side
Higher concentration of IAA on shaded side
Causes dirrectional growth
Shaded side grows faster and causes shoot bend towards the light
Causes cell elongation in shoots

Question 11

IAA in roots

Answer 11

Diffuses in growing region
Inhibits cell elongation in roots
Highrt concentration of IAA on shaded side
Dirrectional growth away from light and towards gravity