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Biology for IGCSE & O level - Coordination And Response (Section 7)

1
What is the primary role of the dendrites in a neuron?
Answer
(B)
To receive signals from other neurons
2
What is the main function of the hormone adrenaline?
Answer
(B)
To prepare the body for the fight or flight response
3
What type of response is a plant's root growing downwards?
Answer
(A)
Geotropism
4
What is the process of blood vessels getting wider called?
Answer
(B)
Vasodilation
5
What is a key feature of a negative feedback system?
Answer
(C)
It maintains a stable internal environment.
6
What term describes growth in response to gravity?
Answer
(B)
Geotropism
7
What is the function of the pupil?
Answer
(D)
To regulate the amount of light entering the eye
8
What stimuli do plants respond to?
Answer
A
B
C
9
What type of response describes a plant bending towards light?
Answer
(B)
Phototropism
10
What term describes the widening of blood vessels?
Answer
(B)
Vasodilation
11
How does the skin help to regulate body temperature in cold conditions?
Answer
(C)
Vasoconstriction
12
What is the role of the skin in temperature regulation during cold weather?
Answer
(C)
Vasoconstriction.
13
What is the function of the efferent neurons?
Answer
(C)
Transmit information from the CNS to the effectors.
14
What is the effect of vasoconstriction on body temperature?
Answer
A
D
15
Which of the following are examples of glands?
Answer
A
B
16
What is the main function of insulin?
Answer
(B)
To decrease blood sugar levels.
17
Which of the following processes is controlled by negative feedback?
Answer
(C)
Body temperature regulation
18
Which part of the nervous system is responsible for coordinating responses and initiating responses?
Answer
(B)
Central Nervous System
19
In a reflex arc, what is the correct sequence of structures involved?
Answer
(A)
Receptor -> Sensory neuron -> Relay neuron -> Motor neuron -> Effector
20
In the fight or flight response, which of the following occur?
Answer
A
C
21
What is an example of a negative feedback loop?
Answer
(C)
Regulation of body temperature.
22
Which part of a plant is most likely to show positive geotropism?
Answer
(C)
Roots
23
What are the main parts of the central nervous system?
Answer
(A)
Brain and spinal cord
24
Which of the following describes the correct pathway for the light to reach the photoreceptors in the eye?
Answer
(B)
Cornea -> Pupil -> Lens -> Retina
25
Which of these is a tropic response?
Answer
(D)
All of the above
26
How does the body respond to rising body temperature?
Answer
A
B
27
Which part of a plant typically exhibits positive geotropism?
Answer
(C)
The roots
28
What structure is responsible for detecting stimuli in a reflex arc?
Answer
(D)
Receptor
29
What happens to the pupil in bright light?
Answer
(B)
It constricts.
30
What does the skin do to cool down the body?
Answer
(C)
Sweating
31
What type of neuron carries signals away from the central nervous system to the effectors, such as muscles or glands?
Answer
(B)
Motor neuron
32
What is the function of the rods in the retina?
Answer
(C)
Vision in dim light
33
What is the main role of the sensory neurons?
Answer
(B)
Carry impulses from receptors to the CNS.
34
What process is involved when the body gets rid of heat?
Answer
(C)
Sweating
35
Which part of the eye is responsible for focusing light onto the retina?
Answer
(A)
Cornea and lens
36
What is the role of glucagon?
Answer
(A)
To increase blood glucose levels.
37
What type of neuron carries signals from the central nervous system to the muscles or glands?
Answer
(B)
Motor neuron
38
Which part of the skin helps to cool the body?
Answer
A
C
39
What is the primary function of adrenaline in the body?
Answer
(C)
To prepare the body for action
40
What is the role of sweat glands in the regulation of body temperature?
Answer
(C)
They release sweat, which cools the body through evaporation.
41
What is the name of the structure that transmits visual information from the eye to the brain?
Answer
(A)
Optic nerve
42
What best describes the effect of adrenaline?
Answer
(A)
Increases heart rate.
43
Which part of the eye is responsible for the formation of the image?
Answer
(A)
Lens
44
What is the role of the hormone, glucagon?
Answer
(C)
To raise blood sugar levels.
45
What type of cells are responsible for vision in dim light?
Answer
(C)
Rods
46
What term describes a plant's growth response to gravity?
Answer
(B)
Geotropism
47
What helps the body to cool down?
Answer
(C)
Sweating
48
Which structures are involved in regulating the diameter of the pupil?
Answer
(B)
Iris muscles
49
Which term describes the movement of a plant in response to the stimulus of gravity?
Answer
(B)
Geotropism
50
What is an example of a chemical substance produced by an endocrine gland?
Answer
(B)
A hormone