CH5

Question 1

4 Characteristic of tropisme

Answer 1

Permanent
Influenced by hormones
Slow and not apparent
Direction depends on direction of stimulus

Question 2

3 Characteristic of nastic responses

Answer 2

Not all for growth
More quicker and more apparent than tropism
Some are intended for survival

Question 3

5 Phytohormones and functions

Answer 3

Auxin
- Functional in phototropism & Geotropism
- Stimulate development of apical dominance in shoots and roots , growth and elongation of roots and shoots cells and cell division in cambium during secondary growth
- Inhibits abscission of fruits and young leaves and growth of lateral buds

Gibberellin
- Stimulates growth and elongation in stem cells & development of leaves, flower, fruits and germination of seeds
- Causes growth of flower in dwarf plants
- Inhibits development of roots

Cytokinin
- Stimulates division and elongation of root and stem cells when auxin is present
- Stimulate seeds germination and growth of lateral buds
- Inhibits development of apical dominance

Abscisic acid
- Inhibits growth of plants
- Stimulate abscission of mature fruit leaves and flower

Ethylene
- Stimulate ripening of fruit and abscission of fruits and leaves

Question 4

Effects of auxin on growth response

Answer 4

Area that receives more auxin grow faster causing coleptiles to curve to that side that receive less or none auxin.