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Biology for IGCSE & O level - Coordination And Response (Section 9)

1
What best describes the sequence of events at a synapse?
Answer
(B)
Impulse arrives at pre-synaptic neuron, neurotransmitters released, impulse travels to post-synaptic neuron, neurotransmitters received.
2
In plants, what is the term for growth in response to the stimulus of light?
Answer
(B)
Phototropism
3
What process is most responsible for heat loss from the skin?
Answer
(C)
Sweating
4
Which part of a plant's growth is affected by auxin?
Answer
(B)
Stem elongation
5
What is an effect of adrenaline on the body?
Answer
A
C
6
Which part of the eye is responsible for bending light to form an image?
Answer
(A)
Cornea
7
Which type of cell in the retina is most sensitive to dim light?
Answer
(C)
Rods
8
What is the role of insulin?
Answer
(B)
To store glucose in the liver as glycogen.
9
What is the function of the blind spot in the eye?
Answer
(A)
It is where the optic nerve exits the eye and has no photoreceptors.
10
What is the primary function of the myelin sheath in a neuron?
Answer
(A)
To increase the speed of nerve impulse transmission
11
What would happen if the body's temperature was too high?
Answer
(A)
The blood vessels dilate.
12
Which of these are involved in maintaining body temperature?
Answer
A
B
D
13
What type of tropism is the bending of a plant stem towards a light source?
Answer
(C)
Phototropism
14
What part of the eye controls the amount of light entering?
Answer
(C)
Pupil
15
What is the role of the axon in a neuron?
Answer
(C)
Transmitting signals away from the cell body
16
Which process helps with heat loss through the skin?
Answer
(B)
Vasodilation
17
Which type of tropism causes plants to grow towards a light source?
Answer
(C)
Phototropism
18
Which part of the eye is responsible for focusing light on the retina?
Answer
(B)
Lens
19
What is the function of the ciliary muscles in the eye?
Answer
(A)
To change the shape of the lens for focusing
20
What is the role of the hormone glucagon?
Answer
(A)
To increase blood glucose levels.
21
What can happen in the skin to help with heat loss?
Answer
(A)
Sweating
22
What is the function of the relay neuron?
Answer
(B)
To connect sensory and motor neurons in the CNS
23
Which of the following describe features of the 'fight or flight' response?
Answer
A
C
24
What part of the body detects changes in body temperature?
Answer
(B)
The brain
25
What are the main characteristics of the nervous system?
Answer
A
C
26
Which type of neuron is found in the brain and spinal cord and is involved in relaying information?
Answer
(C)
Relay neuron
27
Which part of the eye is primarily responsible for refracting light?
Answer
(B)
Lens
28
Which type of neuron carries signals from the brain and spinal cord to muscles or glands?
Answer
(B)
Motor neurons
29
What is the main function of the lens in the eye?
Answer
(C)
To focus light onto the retina.
30
Which structure(s) of the skin help to cool the body?
Answer
A
B
31
What does adrenaline cause?
Answer
(A)
Increased heart rate.
32
What is the correct sequence in a negative feedback loop?
Answer
(A)
Stimulus -> Receptor -> Effector -> Response
33
What type of neuron carries impulses from the spinal cord to the muscles?
Answer
(B)
Motor neuron
34
What does the skin do to help you cool down?
Answer
A
B
35
What type of feedback mechanism is responsible for maintaining a stable internal body temperature?
Answer
(B)
Negative feedback
36
Which of the following best describes the function of the nervous system in relation to the endocrine system?
Answer
(C)
The nervous system and endocrine system work together to control and coordinate bodily functions.
37
What is the term for a plant growing towards light?
Answer
(B)
Phototropism
38
What effect does adrenaline have on the body?
Answer
(C)
It prepares the body for 'fight or flight'.
39
Which of the following correctly describes the function of insulin?
Answer
(C)
Promotes the uptake of glucose by cells.
40
What is an example of a plant hormone?
Answer
(A)
Auxin
41
The sensory system functions to accomplish what?
Answer
(D)
To detect, transmit, and process information
42
Which of the following is an example of a negative feedback mechanism?
Answer
(C)
Regulation of blood glucose
43
What happens to the lens when focusing on a near object?
Answer
(B)
The lens becomes more spherical.
44
In a reflex arc, the correct sequence of events is:
Answer
(B)
Receptor -> Sensory neuron -> Relay neuron -> Motor neuron -> Effector -> Response
45
What is the role of the photoreceptors in the retina?
Answer
(B)
To detect light and convert it into nerve impulses.
46
What type of neuron carries impulses away from the central nervous system to the effectors?
Answer
(C)
Motor neuron
47
What triggers the release of adrenaline?
Answer
A
B
48
What is the role of the liver in regulating blood glucose levels?
Answer
(A)
It stores glucose as glycogen.
49
What is the term for the widening of blood vessels?
Answer
(B)
Vasodilation
50
Which component of a neuron is responsible for receiving incoming signals from other neurons?
Answer
(B)
Dendrites