6 - Simple responses

Question 1

Taxis definition

Answer 1

Directional movement towards/away from a stimulus

Question 2

Kinesis definition

Answer 2

Non-directional movement towards/away from a stimulus

Question 3

Importance of taxis/kinesis

Answer 3

Increases chance of survival:
- Towards light - food - more energy and reproduction + find a mate so more likely to reproduce
- Away from a light - hide from predators + remain in moist conditions to prevent dehydration- water is needed for hydrolysis reactions - forming cytoplasm

Question 4

IAA

Answer 4

• Made in cells of shoot and root tips
• Stimulates cell elongation in shoots
• Inhibits cell elongation in roots

Question 5

Tropism

Answer 5

• Directional growth towards/away from a stimulus
  1-Tip 2-Dffusion 3-Side/Conc 4- stim-Cell elong

Question 6

Advantage of shoots growing towards light

Answer 6

• More light absorbed for photosynthesis - more glucose made for making starch, cellulose for cell walls and for respiration resulting in more ATP for mitosis/growth

Question 7

Advantage of roots growing towards gravity

Answer 7

• More water absorbed - more photosynthesis- more glucose - more respiration- more ATP made for growth
  -Nitrates used to make proteins - ATP for energy release/ respiration/ growth - DNA for DNA replication -RNA for protein synthesis- increases growth
• Phosphates - phospholipids for cell membrane- ATP for energy release/ respiration/ growth - DNA for DNA replication -RNA for protein synthesis- increases growth