The diagram represents a simple reflex arc.
What is the sequence of nerve cells through which an impulse passes during a reflex action?
A (First) P --> Q --> R (Last)
B (First) Q --> R --> P (Last)
C (First) Q --> P --> R (Last)
D (First) R --> P --> Q (Last)
The diagram shows a neurone. Which structures could be found at X and Y?
A X: brain; Y: intestine.
B X: brain; Y: leg.
C X: eye; Y: hand.
D X: gland; Y: spinal chord.
What will be the effect of strenuous exercise on the volume of water lost through the skin and the kidneys?
The diagram shows a section through an eye.
Which structure controls how much light enters the pupil?
What are the effects of adrenaline?
A Breathing Rate: decreased; Pulse Rate: decreased
B Breathing Rate: increased; Pulse Rate: increased
C Breathing Rate: increased; Pulse Rate: no effect
D Breathing Rate: no effect; Pulse Rate: increased
A person has been sitting in a room at 35 °C for 30 minutes.
What would be the effect of then drinking several glasses of iced water?
A Blood Temperature: falls ; Rate of Sweating: falls
B Blood Temperature: falls ; Rate of Sweating: rises
C Blood Temperature: rises ; Rate of Sweating: falls
D Blood Temperature: rises ; Rate of Sweating: rises
Which organ produces a hormone?
D spinal cord
The diagram shows the structures involved in a reflex action.
What is the sequence in which impulses pass through these structures?
A P → S → R → Q
B Q → R → S → P
C Q → P → R → S
D S → P → Q → R
Which part of the human eye is sensitive to light?
C optic nerve
The diagram shows an experiment to investigate the response of a plant stem to gravity.
What is a suitable control for this experiment?
Why do mammals sweat?
A to cool the body
B to lose water vapour through the skin surface
C to release energy through the oxidation of glucose
D to remove glucose from the blood
The diagram shows a section through part of the human eye.
When a person looks at an object which is far away from their eye, which of the following happens?
A suspensory ligaments: slacken; lens: becomes fatter
B suspensory ligaments: slacken; lens: becomes thinner
C suspensory ligaments: tighten; lens: becomes fatter
D suspensory ligaments: tighten; lens: becomes fatter
The diagram shows a capillary loop in the skin of a mammal.
What will the capillary loop look like if the mammal becomes cold?
The diagram shows muscles and bones in a person’s arm.
What happens to the muscles as the weight is lowered?
A Biceps: lengthens; Triceps: lengthens
B Biceps: lengthens; Triceps: shortens
C Biceps: shortens; Triceps: lengthens
D Biceps: shortens; Triceps: shortens
The diagram shows the density of rods and cones across a horizontal section of the retina.
What is the position of the optic nerve?
What are the effects of insulin and glucagon on the concentration of blood glucose?
How does the skin react when the body becomes very warm?
Which diagram shows a sensory neurone?
The diagram shows the muscles that control the size of the pupil in an eye.
How do the muscles make the pupil smaller?
What would be the effects of vasodilation and sweating on the body temperature and on the amount of moisture on the surface of the skin?
What would be the pupil size and lens shape of a person reading a mobile phone text message in a brightly-lit room?
The table shows a student’s water losses on a cool day.
On a hot day the student’s water intake was the same as on the cool day.
On the hot day, which water losses would increase and which would decrease?
A increase: in sweat; decrease: in expired air.
B increase: in sweat; decrease: in urine.
C increase: in urine; decrease: in faeces .
D increase: in urine; decrease: in sweat.
After a meal containing carbohydrates, which row shows the changes in concentration of glucose
and urea in the blood as it passes through the liver?
Which response is a result of geotropism?
A flowers being produced
B growing bigger leaves
C roots growing downwards
D seeds germinating
Which target organ releases glucose into the blood-stream as a result of the action of adrenaline?
A adrenal gland