Lesson 3.6.4.1.1
3.6.4.1.1 Homeostasis and negative feedback Quiz: AQA Biology, Unit 6
20 questions
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Lesson 3.6.4.1.1, Homeostasis and negative feedback: 20 multiple choice questions for the AQA Biology (7402), Unit 6: Organisms respond to changes in their internal and external environments, written with Revision Ninja.
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The 20 questions
-
What is the biological definition of homeostasis?
- Unchanging external habitat
- Constant cellular division
- Maximum metabolic rate
- Stable internal environment
-
What is the primary function of negative feedback in homeostatic control?
- Restoring original level
- Increasing core temperature
- Halting all metabolism
- Amplifying initial change
-
Which sequence correctly lists the components of a homeostatic control loop?
- Effector, receptor, stimulus
- Receptor, coordinator, effector
- Coordinator, stimulus, response
- Stimulus, effector, receptor
-
Why is maintaining a stable core body temperature essential in mammals?
- Maintaining blood pressure
- Optimising enzyme activity
- Storing excess glucose
- Preventing cell lysis
-
What happens to enzymes when blood pH changes beyond their optimum?
- Hydrolysis
- Saturation
- Activation
- Denaturation
-
Why must blood glucose concentration be regulated closely in humans?
- Maintaining water potential
- Maintaining body temperature
- Preventing protein denaturation
- Maintaining blood pH
-
What is the characteristic effect of positive feedback in a system?
- Stabilising internal limits
- Halting hormone release
- Restoring set point
- Amplifying initial change
-
Which hormone is secreted to lower blood glucose levels after a carbohydrate-rich meal?
- Glucagon
- Glycogen
- Adrenaline
- Insulin
-
Which hormone is released by the pancreas in response to falling blood glucose?
- Glycogen
- Insulin
- Glucagon
- Oestrogen
-
What is the primary cooling mechanism of sweating when core temperature rises?
- Vasodilation of arterioles
- Radiation of heat
- Evaporation of sweat
- Vasoconstriction of capillaries
-
Which type of tissue carries out shivering to generate heat when cold?
- Cardiac muscle
- Adipose tissue
- Smooth muscle
- Skeletal muscle
-
What type of feedback mechanism amplifies the initial stimulus during childbirth contractions?
- Dynamic feedback
- Neutral feedback
- Positive feedback
- Negative feedback
-
Why are separate mechanisms needed to control departures in opposite directions?
- Faster enzymes
- Less energy
- Greater control
- More receptors
-
Which physiological responses reduce a core body temperature of 39 degrees Celsius?
- Sweating and vasodilation
- Shivering and vasodilation
- Shivering and vasoconstriction
- Sweating and vasoconstriction
-
Which component of a homeostatic system processes receptor information and sends instructions?
- Coordinator
- Stimulus
- Effector
- Receptor
-
Which process drives internal conditions further away from the norm?
- Vasoconstriction
- Positive feedback
- Negative feedback
- Osmoregulation
-
What effect do extreme pH changes have on metabolic enzymes in the blood?
- Denaturation
- Replication
- Phosphorylation
- Activation
-
What is the immediate effect on cells when blood water potential becomes very low?
- Osmosis inwards
- Active transport
- Osmosis outwards
- Simple diffusion
-
What term describes the target value around which a controlled variable is maintained?
- Set point
- Effect point
- Norm value
- Threshold level
-
Which response acts as negative feedback when core body temperature falls?
- Sweating
- Vasodilation
- Vasoconstriction
- Panting
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