Tropism and Taxis in Organisms

The video discusses the movement of organisms or cells in response to stimuli, focusing on taxis, kinesis, and tropism. Taxis is directional, kinesis is non-directional, and tropism involves growth. The video further classifies taxis based on stimuli, such as chemotaxis, phototaxis, and thermotaxis. A detailed explanation of chemotaxis in bacteria is provided, illustrating how bacteria move towards or away from chemical stimuli like glucose or phenol.

What is the primary characteristic of taxis in organisms?

• Non-directional movement

• Growth response

• Directional movement

• Random movement

How does tropism differ from taxis?

• Tropism is non-directional

• Tropism occurs only in animals

• Tropism is a growth response, not a movement

• Tropism is a random movement

What is the main difference between taxis and kinesis?

• Taxis is non-directional, kinesis is directional

• Taxis is directional, kinesis is non-directional

• Taxis occurs in plants, kinesis in animals

• Taxis is a growth response, kinesis is a movement

Which organisms are primarily associated with kinesis?

• Plants

• Bacteria

• Insects and arthropods

• Fungi

In which organisms is tropism exclusively found?

• Bacteria

• Animals

• Plants

• Fungi

What type of taxis is stimulated by light?

• Magnetotaxis

• Chemotaxis

• Phototaxis

• Thermotaxis

Which type of taxis is influenced by temperature?

• Barotaxis

• Chemotaxis

• Thermotaxis

• Phototaxis

Which of the following is not a type of taxis?

• Kinetotaxis

• Chemotaxis

• Phototaxis

• Thermotaxis

Which of the following is an example of chemotaxis?

• Movement towards a chemical nutrient

• Movement towards light

• Movement in response to temperature

• Movement away from a magnetic field

What is the response of bacteria to a toxic chemical in their vicinity?

• They grow towards it

• They remain stationary

• They move towards it

• They move away from it