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Biology for IGCSE & O level - Coordination And Response (Section 2)

1
Which cells are responsible for night vision?
Answer
(A)
Rods
2
Which of the following are features of adrenaline?
Answer
A
B
C
3
What is the function of the sensory neurons?
Answer
(B)
To transmit impulses from receptors to the CNS
4
Which part of the nervous system is responsible for involuntary actions?
Answer
(D)
Autonomic nervous system
5
What is the role of the ciliary muscles?
Answer
(B)
To change the shape of the lens
6
What is the purpose of the iris?
Answer
(B)
To control the amount of light entering the eye.
7
In plant tropisms, what does 'tropism' specifically refer to?
Answer
(B)
A growth response in a specific direction.
8
What is the function of the plant hormone auxin?
Answer
(C)
To promote cell elongation and growth
9
Which of the following is the primary function of the nervous system?
Answer
(C)
Coordination and regulation of body functions
10
What is the role of the stem in a plant?
Answer
A
B
11
What is the process by which the eye adjusts to see objects at different distances?
Answer
(A)
Accommodation
12
How does the skin contribute to thermoregulation?
Answer
A
C
13
In the human eye, the light that enters is first filtered by which structure?
Answer
(A)
Cornea
14
What type of response is a plant's growth towards light?
Answer
(C)
A positive phototropic response
15
What kind of light do the rods detect?
Answer
(C)
Dim light
16
In a reflex arc, the correct sequence of events is:
Answer
(B)
Receptor -> Sensory neuron -> Relay neuron -> Motor neuron -> Effector
17
Which part of the plant exhibits negative phototropism?
Answer
(A)
The roots.
18
Which part of the nervous system integrates sensory information and generates appropriate responses?
Answer
(B)
Central nervous system
19
What is the role of glucagon in blood glucose regulation?
Answer
(B)
It stimulates the breakdown of glycogen into glucose.
20
What part of the eye changes shape to focus light on the retina?
Answer
(C)
Lens
21
What is the relationship between a hormone and its target cells?
Answer
(C)
Hormones affect only cells with specific receptors for that hormone.
22
What is the primary function of hormones?
Answer
(D)
To regulate and coordinate various bodily functions.
23
Which part of the plant exhibits negative geotropism?
Answer
(B)
The stem
24
Which system plays a key role in the control of body temperature?
Answer
(D)
The nervous system
25
Which part of the eye contains the photoreceptor cells (rods and cones)?
Answer
(C)
Retina
26
Which two systems work together to coordinate responses in the human body?
Answer
(C)
Endocrine and nervous
27
What is the role of the adrenal glands in the stress response?
Answer
(B)
They produce adrenaline to prepare the body.
28
In a plant, which direction does the stem generally grow?
Answer
(B)
Away from the ground
29
What are the two main types of plant tropisms?
Answer
(B)
Phototropism and geotropism
30
What cells are responsible for detecting light intensity?
Answer
(B)
Rods
31
Which of the following is NOT involved in the 'fight or flight' response?
Answer
(B)
Pupil constriction
32
Which part of the body acts as the 'thermostat' for maintaining body temperature?
Answer
(B)
The hypothalamus
33
Which of these statements accurately describes the difference between geotropism and phototropism?
Answer
(C)
Geotropism is a response to gravity, while phototropism is a response to light.
34
Which system is primarily responsible for coordinating rapid responses to stimuli?
Answer
(B)
The nervous system
35
What is the purpose of the 'thermostat' in the context of body temperature regulation?
Answer
(B)
To detect changes in body temperature and initiate corrective responses.
36
What is the function of the presynaptic neuron in a synapse?
Answer
(B)
To release neurotransmitters
37
What is the role of auxin in plants?
Answer
(A)
Auxin controls plant growth by causing the cells to elongate.
38
Which gland is responsible for the production of insulin and glucagon?
Answer
(B)
The pancreas
39
How does the body react to the presence of cold surroundings?
Answer
(B)
Vasoconstriction and shivering.
40
Which of the following is a characteristic of a negative feedback mechanism?
Answer
(B)
It helps maintain a stable internal environment.
41
Which organ is primarily responsible for the body's initial response to a stressful situation (e.g., 'fight or flight')?
Answer
(B)
The adrenal glands
42
Which part of a neuron receives signals from other neurons?
Answer
(B)
Dendrite
43
What is the main function of the hormone cortisol?
Answer
(C)
Managing the stress response.
44
What structure is part of the central nervous system?
Answer
(C)
Brain
45
What is the role of glucagon in the regulation of blood sugar levels?
Answer
(A)
It increases blood sugar levels by causing the liver to release stored glucose.
46
What type of feedback loop is involved in blood glucose regulation?
Answer
(B)
Negative feedback only
47
What is the role of the kidneys in maintaining homeostasis?
Answer
(B)
Filtering waste from the blood and regulating water balance
48
What type of cell is responsible for the insulation of axons in the peripheral nervous system?
Answer
(B)
Schwann cells
49
What is the name of the enzyme that kills bacteria in the eye?
Answer
(A)
Lysozyme
50
What is the function of interneurons?
Answer
(C)
To connect sensory and motor neurons