Unit 6 Survival And Response

Question 1

Suggest two advantages of simple reflexes

Answer 1

1.rapid
2.protect against damage to body tissue
3.do not have to be learned
4.help escape from predators
5.enable homeostatic control

Question 2

Use your knowledge of indoleactic acid (IAA) to explain the curved growth of the shoot

Answer 2

1. Tip produces IAA
2. IAA diffuses into shoot
3. More elongation of cells on one side than other

Question 3

Explain how the uneven distribution of IAA causes a root to bend

Answer 3

1. IAA at bottom of roots, low concentration leading to inhibition elongation of cells
2. IAA at top of the root, low concentration causes elongation of cells

Question 4

Explain what a taxis is

Answer 4

directional movement, meaning the organism moves towards (positive taxis) or away from (negative taxis) a specific stimulus, such as light, chemicals, or gravity.

Question 5

Explain what kinesics is

Answer 5

organism doesn’t move in a specific direction, but rather changes its speed or turning rate in response to a stimulus.