Taxes And Kineses

A TAXIS is a directional response to a stimulus. This means that when a stimulus is present, such as light or heat, an organism will move in a specific direction in response to that stimulus. This movement can be towards the stimulus (positive taxis) or away from the stimulus (negative taxis). Therefore, the correct answer is "directional" because it accurately describes the nature of a taxis response.

The correct answer is "taxes" because the plural form of "taxi" is "taxis". The word "taxes" is written in both singular and plural form, but the correct plural form is "taxis".

Positive chemotaxis would be used to describe a movement towards a potential mate's pheromones. Chemotaxis refers to the movement of an organism in response to a chemical stimulus, and positive chemotaxis specifically refers to movement towards the source of the chemical. In this case, the organism is moving towards the pheromones released by a potential mate, indicating attraction or interest.

Photokinesis refers to a non-directional response to light. It is a general term that encompasses various behaviors exhibited by organisms in response to light, such as changes in locomotion or activity levels. Unlike the other options, photokinesis does not involve a specific directional movement towards or away from light, making it the correct answer in this context.

Positive chemotaxis is the process in which an organism moves towards a higher concentration of a particular chemical substance. In the case of a goldfish swimming towards food flakes, it is likely exhibiting positive chemotaxis because it is attracted to the chemical signals released by the food flakes. The goldfish's sensory organs detect these chemicals, causing it to swim towards the source of the food in order to feed.

The growth of a pea root towards the centre of the Earth is not positive gravitaxis because taxis is the word used for an oriented response in an animal. Since a pea root is a plant, it does not exhibit taxis but instead shows positive geotropism, which is the growth response of a plant towards gravity.

A hermit crab retracting into its shell when a shadow passes over it is an example of kinesis. Kinesis is a type of animal behavior where the organism responds to a stimulus by changing its activity level but not its direction. In this case, the hermit crab's movement of retracting into its shell is not directed towards or away from the shadow, but rather a random change in its activity level in response to the stimulus.

D) is an interesting one. It is true that responses to gravity by animals are limited to small or unicellular organisms. 'Not me then' you say; but ask yourself, When were you a simple organism? When you were an embryo with only a few cells. At some stage your cells began to differentiate (become specialized); gravity may play a role in this. I have always found this fascinating - does this mean that humans could not reproduce in space...how much gravity is needed? This is a great example of the way that in Science, one possible answer leads to many more questions....

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Thigmokinesis is the correct answer because it is the term used to describe the behavior of a snail retracting into its shell when touched from any direction. This behavior is a response to physical contact and is a protective mechanism for the snail.