Taxis and Kinesis in Wood Lice

The video tutorial covers the concepts of taxis and kinesis, essential for A-level biology exams. Taxis is a directional response to stimuli, such as light or chemicals, while kinesis is a non-directional response. The video explains these concepts with examples, focusing on organisms like woodlice. It also describes the choice chamber experiment, which demonstrates these behaviors. The tutorial concludes with exam practice questions to reinforce learning.

What is the primary focus of the video tutorial?

• Taxis and Kinesis in A-level biology

• Photosynthesis processes

• Cell division

• Genetic mutations

Which of the following describes a movement towards light?

• Chemotaxis

• Negative phototaxis

• Positive phototaxis

• Hydrotaxis

Why do wood lice demonstrate negative phototaxis?

• To increase their speed

• To avoid light and stay in damp areas

• To find food

• To attract mates

What is kinesis?

• Directional movement towards a stimulus

• Non-directional movement in response to a stimulus

• Movement towards a chemical

• Movement towards water

How do wood lice behave in high humidity?

• Move towards light

• Stay still

• Move slowly and make fewer turns

• Move rapidly and make more turns

What is the purpose of a choice chamber experiment?

• To test the mating behavior of organisms

• To allow organisms to choose favorable conditions

• To observe the feeding habits of organisms

• To measure the speed of organisms

In a choice chamber, what behavior do wood lice exhibit when one side is dark?

• Chemotaxis

• Negative phototaxis

• Positive phototaxis

• Hydrotaxis

What should be controlled in a choice chamber experiment?

• The color of the chamber

• The time of day the experiment is conducted

• The type of organism used

• All variables except the one being investigated

What behavior did the beetles exhibit in the exam practice question?

• Positive phototaxis

• Chemotaxis

• Hydrotaxis

• Negative phototaxis

What is one advantage of positive phototaxis for beetles?

• All of the above

• Avoiding predators

• Finding a mate

• Avoiding competition