Survival and Response (finish practical)

Question 1

What must organisms do in order to survive?

Answer 1

Respond to their environment.

Question 2

What does responding to their environment do for an organism?

Answer 2

It increases their chances of survival, by responding to changes in the external environment.

Question 3

What are examples of an organism responding to the environment, increasing their chance of survival?

Answer 3

• Animals can move away from harmful environments (e.g. too hot or too cold).
• Plants change the way they grow in an attempt to find more favourable environmental conditions.

Question 4

What else do organisms do to increase their chance of survival?

Answer 4

Organisms respond to changes in their internal environment to make sure the conditions are always optimal for their metabolism.

Question 5

What is an organisms metabolism?

Answer 5

All the chemical reactions that go on inside them.

Question 6

What do simple organisms do as a response to environmental changes?

Answer 6

Simple responses, either:
•Tactic (taxis)
•Kinetic (kinesis

Question 7

What is a tactic response?

Answer 7

Directional movement in response to a stimulus, the direction of the stimulus affects the response.

Question 8

What is an example of a tactic response?

Answer 8

Woodlice moving away from light.

Question 9

How is woodlice moving away from light beneficial?

Answer 9

Because it helps them to survive:
•It keeps them concealed under stones during the day (where they’re safe from predators).
•It keeps them in damp conditions (reducing water loss).

Question 10

What is a kinetic response?

Answer 10

Non-directional (random) movement in response to stimulus, the intensity of the stimulus affects the response.

Question 11

What is an example of a kinetic response?

Answer 11

Woodlice in response to humidity.

Question 12

What do woodlice do in conditions of high humidity?

Answer 12

They move slowly and turn less often, so they stay where they are.

Question 13

What do woodlice do in response to low humidity?

Answer 13

As the air gets drier, they move faster and turn more often, so that they move into a new area.

Question 14

Why is woodlice responding this way to levels of humidity beneficial?

Answer 14

Because it improves their chance of survival by reducing water loss and staying concealed (in more humid areas).

Question 15

Required practical 10

Answer 15

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