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Biology for IGCSE & O level - Coordination And Response (Section 6)

1
Which of the following are examples of negative feedback mechanisms?
Answer
A
B
2
What is the main function of the skin in terms of temperature regulation?
Answer
A
B
3
Which of the following is NOT a function of the skin?
Answer
(C)
Producing hormones like insulin
4
What is the name for the body maintaining a stable internal environment?
Answer
(B)
Homeostasis
5
Where does the initial step of the action take place?
Answer
(B)
Dendrites
6
Which part of the eye is involved in detecting pain and temperature?
Answer
(A)
Cornea
7
Which of the following is an example of a hormone?
Answer
(A)
Insulin
8
Which term describes a plant's response to water?
Answer
(C)
Hydrotropism
9
What is the name of the gap between two neurons?
Answer
(B)
Synaptic cleft
10
Which of the following is a function of the nervous system?
Answer
A
B
C
11
What is the function of the skin?
Answer
(B)
To control body temperature.
12
What is the name of the plant response to light?
Answer
(B)
Phototropism
13
What are the key elements of the endocrine system?
Answer
A
B
D
14
What process occurs in the skin to release heat?
Answer
(C)
Sweating
15
In the event of a threat, what does adrenaline do?
Answer
(B)
Increases heart rate and prepares for action.
16
Which of the following processes is an example of positive feedback?
Answer
(B)
Blood clotting
17
Which of the following best describes a hormone?
Answer
(A)
A chemical messenger transported by blood.
18
What is the function of the ciliary muscles in the eye?
Answer
(B)
To change the shape of the lens.
19
Which of the following is/are involved in the sense of touch?
Answer
A
B
20
Which of these is a function of the spinal cord?
Answer
A
C
21
Which of the following best describes the relationship between the endocrine and nervous systems?
Answer
C
D
22
Which structures in the skin help with temperature regulation?
Answer
A
B
C
23
What happens to the body in a 'fight or flight' situation?
Answer
(A)
Heart rate increases, breathing rate increases.
24
What is the sequence of the reflex arc pathway?
Answer
(A)
Sensory neuron -> Relay neuron -> Motor neuron -> Effector
25
What is a synapse?
Answer
(B)
The junction between two neurons
26
Which of the following are involved in accommodation to view near and far objects?
Answer
A
B
27
Which of the following is NOT a type of sensory receptor?
Answer
(D)
Motor neurons
28
Which hormone is most directly responsible for increasing blood glucose levels?
Answer
(B)
Glucagon
29
Which hormone is secreted by the adrenal glands?
Answer
(C)
Adrenaline
30
What does the 'fight or flight' response prepare the body to do?
Answer
(C)
Face danger or escape.
31
What type of light-sensitive cells are responsible for color vision?
Answer
(B)
Cones
32
Which organ produces insulin?
Answer
(C)
Pancreas
33
Which structure in the eye is responsible for detecting color?
Answer
(B)
Cones
34
What type of cells are found in the retina?
Answer
A
B
D
35
What is the effect of adrenaline on the heart?
Answer
(B)
Increases heart rate.
36
How does the body respond to the cold?
Answer
(D)
Shivering
37
Which of the following is NOT a function of the nervous system?
Answer
(C)
Producing hormones
38
What is the main function of the skin?
Answer
(A)
To protect the body from damage.
39
What is the role of neurotransmitters in synaptic transmission?
Answer
(C)
To chemically transmit the signal across the synapse
40
What is the role of the myelin sheath?
Answer
A
B
41
Where are the photoreceptor cells (rods and cones) located?
Answer
(D)
Retina
42
In a simple reflex arc, where does the processing of information occur?
Answer
(C)
The relay neuron
43
Which of the following statements about negative feedback mechanisms is correct?
Answer
A
C
D
44
What type of cells in the retina are responsible for vision in bright light and for detecting fine details?
Answer
(B)
Cones
45
Which structures are involved in controlling body temperature?
Answer
A
B
46
What is the role of the relay neurons in a reflex arc?
Answer
(C)
To transmit impulses from sensory to motor neurons.
47
What happens to blood vessels when the body needs to cool down?
Answer
(B)
They dilate (widen).
48
What part of the eye is responsible for detecting color?
Answer
(B)
Cones
49
What are some functions of adrenaline?
Answer
(D)
All the above
50
Which part of the neuron receives signals from other neurons?
Answer
(B)
Dendrites