Survival And Response Flashcards
1
Q
Give one advantage of taxis to organisms.
A
to avoid competition, to find a mate, increase dispersal, to avoid predators
2
Q
Suggest two advantages of simple reflexes.
A
- Rapid;
- Protect against damage to body tissues;
- Do not have to be learnt;
- Help escape from predators;
- Enable homeostatic control.
3
Q
Use your knowledge of indoleacetic acid (IAA) to explain the curved growth of a shoot (3)
A
- Tip produces IAA;
Accept source/release for produces but ignore contains/stores IAA. - IAA diffuses (into shoot);
Accept auxin for IAA.
Accept IAA diffuses down. - (More) elongation of cells on one side (than other);
4
Q
Explain how the uneven distribution of IAA causes a root to bend (2)
A
- (IAA) at bottom of root/where AII concentration high inhibits expansion/elongation (of cells);
- (IAA) at the top of the root/where IAA concentration low leads to expansion/elongation (of cells)