6- Survival & Response =)

Question 1

Data from an experiment shows that as IAA concentration increases, mean length of shoots increases.
Explain the results and suggest how it might have differed if lengths of root had been used. (2)

Answer 1

• IAA stimulates cell elongation
• elongation inhibited in rots

Question 2

Suggest two advantages of simple reflexes. (2)

Answer 2

1. rapid
2. protects against damage to body tissues
3. x have to be learnt
4. helps escape from predators
5. ✔ homeostatic control

Question 3

Suggest one advantage to adult beetles by showing positive phototaxis. (1)

Answer 3

• avoid comp
• find a mate
• avoid predators
• ↑ dispersal