Sign In

Biology for IGCSE & O level - Coordination And Response (Section 3)

1
What part of a neuron transmits signals away from the cell body?
Answer
(C)
Axon
2
Which of the following is a sensory receptor?
Answer
(D)
A taste bud
3
What are some components of a reflex arc?
Answer
A
B
C
4
In what way does the body typically respond to an increase in its internal temperature?
Answer
(C)
Sweating.
5
What is the space between the presynaptic neuron and postsynaptic neuron called?
Answer
(A)
Synaptic cleft
6
Which structures are directly involved in detecting light in the eye?
Answer
A
B
7
Which of the following is a characteristic of a plant exhibiting positive phototropism?
Answer
(B)
The plant's stem is growing towards the light.
8
Which part of the brain is responsible for coordinating movement and balance?
Answer
(B)
Cerebellum
9
Which of the following best describes the role of the hormone, glucagon?
Answer
(A)
It increases blood glucose levels.
10
What best describes the process of homeostasis?
Answer
(A)
Maintaining constant internal conditions.
11
What are the structures involved in the pupil reflex?
Answer
A
B
12
Which of the following describes the function of the rods and cones?
Answer
A
B
13
What part of the eye is responsible for detecting color?
Answer
(B)
Cones
14
What is the primary function of the endocrine system?
Answer
(B)
To coordinate the actions of the body in a similar way to the nervous system.
15
Which of the following is a characteristic of a plant stem?
Answer
(C)
It is negatively geotropic.
16
Which process allows the skin to lose heat through the evaporation of sweat?
Answer
(D)
Evaporation
17
Which hormone is involved in the breakdown of glycogen to glucose?
Answer
(B)
Glucagon
18
Which of these describes what happens to the lens when we look at a close object?
Answer
(B)
The lens becomes thicker and rounder
19
What happens to the blood vessels in the skin when the body is trying to cool down?
Answer
(B)
They dilate.
20
Which type of photoreceptor cell is mainly responsible for color vision?
Answer
(B)
Cones
21
What is the definition of 'secretion'?
Answer
(A)
The release of a substance from a cell.
22
Which of the following is a role of the rods in the retina?
Answer
(C)
Seeing in dim light
23
In the context of plant tropisms, which of the following is NOT a common external stimulus?
Answer
(D)
Temperature
24
What is the primary role of sensory neurons?
Answer
(C)
To transmit impulses from receptors to the CNS
25
What happens to the blood vessels near the skin's surface when the body needs to lose heat?
Answer
(B)
They dilate, increasing heat loss.
26
Which cells are responsible for color vision in the eye?
Answer
(B)
Cones
27
What is the function of the suspensory ligaments?
Answer
(B)
To hold the lens in place and help change its shape
28
What is the main function of blood vessels in thermoregulation?
Answer
(B)
Adjusting the amount of heat lost from the body.
29
What happens at the synapse?
Answer
(C)
Chemical signals are transmitted
30
What is the primary stimulus for phototropism in plants?
Answer
(B)
Light
31
Which parts of the eye are involved in focusing light?
Answer
A
B
32
Which of the following actions is caused by a decrease in body temperature?
Answer
A
D
33
What part of the eye controls the amount of light entering?
Answer
(B)
Iris
34
Which of the following statements best describes the relationship between the endocrine and nervous systems?
Answer
(D)
They work together to coordinate body functions.
35
What type of cell is responsible for the sense of taste?
Answer
(A)
Chemoreceptor cells
36
What is the role of the skin in thermoregulation?
Answer
(D)
Both A and B.
37
What is the role of the hypothalamus in maintaining body temperature?
Answer
(B)
The hypothalamus acts as a thermostat, detecting changes in body temperature.
38
What is the role of the iris?
Answer
(C)
To control the amount of light entering the eye
39
What is the function of the lens?
Answer
(A)
To focus light onto the retina
40
What is the effect of the hormone adrenaline?
Answer
(B)
It prepares the body for fight or flight.
41
What is the function of a motor neuron?
Answer
(B)
To transmit impulses from the CNS to effectors
42
Which cells in the eye are responsible for detecting color?
Answer
(B)
Cones
43
What is the primary function of the skin in terms of thermoregulation?
Answer
(C)
To regulate body temperature.
44
Which of the following best describes the action of adrenaline?
Answer
(C)
Increases heart rate and breathing rate.
45
Which of the following is NOT a response of the body during the 'fight or flight' response?
Answer
(C)
Increased digestion
46
What is the name of the structure that relays information from the eye to the brain?
Answer
(A)
Optic nerve
47
What is the role of myelin sheath?
Answer
(B)
To speed up the transmission of nerve impulses
48
How does the body usually respond to a drop in its internal temperature?
Answer
(C)
Shivering to generate heat.
49
What is the role of the receptors in target cells?
Answer
(C)
To receive and bind to hormones.
50
What type of growth response is exhibited by the roots of a plant?
Answer
(B)
Geotropism