Is this a mistake in the text book? AQA Unit 5

I asked my biology teacher and he said that the textbook was right, but he's an idiot and I'm not convinced... so I'm asking you guys

In captor 9.1 - Sensory Reception, the textbook says "An example of a kinesis occurs in woodlice. [...] When they are in a dry area they move more rapidly and change direction more often. This increases their chance of moving into a different area.

However this doesn't make any sense to me. Surely if woodlice wanted to find a new area, they should change direction less often. When they find a favourable area, they should then change direction more often, keeping them in the same place.

Help?

This is definitely a mistake, when in favourable conditions a kinesis would be that the organism slows down movement and changes direction more.

When is unfavourable conditions, the organism will speed up and change direction LESS

Guys.. the OCR textbook says that "if placed in dry/bright conditions woodlice will move around rapidly and randomly" Doesn't that imply an increased rate of turning as well?

I asked my biology teacher and he said that the textbook was right, but he's an idiot and I'm not convinced... so I'm asking you guys

In captor 9.1 - Sensory Reception, the textbook says "An example of a kinesis occurs in woodlice. [...] When they are in a dry area they move more rapidly and change direction more often. This increases their chance of moving into a different area.

However this doesn't make any sense to me. Surely if woodlice wanted to find a new area, they should change direction less often. When they find a favourable area, they should then change direction more often, keeping them in the same place.

Help?

woodlice do not like to be dry, they are moving more rapidly to find the favourable moist area more quickly, such is kinesis

I know I completely understand the part about moving more rapidly, notice it is the part about the changing direction more often that I put in bold font.

If you were to change direction more often you would be more likely to stay in the same place. In order to find pastures new, the woodlice should walk rapidly in a straight line, surely?

I know I completely understand the part about moving more rapidly, notice it is the part about the changing direction more often that I put in bold font.

If you were to change direction more often you would be more likely to stay in the same place. In order to find pastures new, the woodlice should walk rapidly in a straight line, surely?

erm no, that would be a taxes

No it's not a mistake, as said before moving towards a new area would be taxis not kinesis. If they are moving quickly and changing direction often they are more likely to find a favourable enviroment and when they do their rate of movement is reduced to stay in the enviroment. That's what I learnt for the exam last year

It is a mistake, if you change direction more often, you are likely to stay in the same place eg. running around in a circle, will keep you in roughly the same favourable conditions. The book states that when in unfavourable conditions, you change directions more, in order to stay in the same place, now that wouldn't be very suitable if you wanted to get out of the unfavourable conditions would it?

Remember a kinesis is not a directional movement towards or away from a stimulus, a kinesis where the organism is in unfavourable conditions means it will speed up and change directions less, not completely change the direction. The woodlice needs to find damp conditions, it can't just walk in a straight line, what if it hits a rock? Climb over it into more light/dry conditions, not good

Well yes I don't mean that the woodlice to stick to the straight line religiously, should have just wrote change direction less I guess.

But you agree that the text book has got it slightly wrong?

I thought it was right... because changing direction more times makes you more likely to find somewhere NEW quicker, with more favourable conditions?

Oh im confused. -.-

Take a look at the drawings I've attached, all the lines are the same length(theoretically, I haven't measured them), the line on the top is where the direction has been changed more, so it stays closer together, the line in the middle is where a woodlice has changed directions less, and is moving out of unfavourable conditions. The line on the bottom represents a woodlice in favourable conditions, so it has changed directions more to stay in these conditions. See how it has barely moves from where it has started?