3.6.1.1 - SURVIVAL AND RESPONSE

Question 1

scientists found that the insects moved for 94% of the time in the more humid side, but in the drier side they moved only 20% of the time. the scientists concluded that reduced movement in the drier side was an adaptation that reduced water loss.

use your own knowledge of gas exchange in insects to explain how this behaviour would reduce water loss in the insects (2)

Answer 1

1. less respiration so less gas exchange
2. so spiracles open less so less water loss

Question 2

give one similarity and one difference between a taxis and a tropism (2)

Answer 2

similarity: both a directional response to a stimulus

difference:
- tropism occurs in plants and taxis occurs in animals
- in taxis, the whole organism moves and tropism is a growth response