Coordination and Response
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Nervous control in humans
SubtopicNervous control in humans under Coordination and Response for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
Which of these is an example of an effector in a human nervous response?
A.The retina in the eye
B.A muscle in the arm
C.The spinal cord
D.A pressure-sensitive cell in the skin
- 2.
What is the primary function of the myelin sheath surrounding an axon?
A.To provide nutrients to the neurone
B.To act as a receptor for neurotransmitters
C.To increase the speed of electrical impulse transmission
D.To protect the cell body from mechanical damage
- 3.
Which of the following describes the correct sequence of cells through which an impulse passes during a reflex arc?
A.Motor neurone → Relay neurone → Sensory neurone
B.Sensory neurone → Motor neurone → Relay neurone
C.Sensory neurone → Relay neurone → Motor neurone
D.Relay neurone → Sensory neurone → Motor neurone
Download the worksheet for Coordination and Response - Nervous control in humans to practice offline. It includes additional chapter-level practice questions.
Sense organs (Eye)
SubtopicSense organs (Eye) under Coordination and Response for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
Why is there a 'blind spot' in the human eye?
A.It is the area where the cornea is thickest.
B.It is the point where the lens focuses light too strongly.
C.It is the area where most cone cells are concentrated.
D.It is the point where the optic nerve exits the eye and lacks photoreceptors.
- 2.
Where are the specialized light-sensitive cells, known as rods and cones, located in the eye?
A.Sclera
B.Retina
C.Choroid
D.Vitreous humour
- 3.
In the human eye, light follows a specific path to reach the photoreceptors. Based on the diagram below, which sequence correctly identifies the order of structures light passes through?
A.Cornea → Pupil → Lens → Retina
B.Lens → Cornea → Pupil → Retina
C.Pupil → Lens → Cornea → Retina
D.Cornea → Lens → Pupil → Retina
Download the worksheet for Coordination and Response - Sense organs (Eye) to practice offline. It includes additional chapter-level practice questions.
Preview questions (no answers)
- 1.
Which hormone is secreted by the pancreas in response to high blood glucose levels?
A.Glycogen
B.Glucagon
C.Insulin
D.Adrenaline
- 2.
In a 'fight or flight' situation, the release of adrenaline causes several physiological changes. Which of the following is an effect of adrenaline?
A.Decrease in the rate of breathing
B.Constriction of the pupils in the eyes
C.Increase in the pulse rate
D.Diversion of blood flow away from the muscles to the gut
- 3.
Which endocrine gland is correctly matched with the hormone it produces?
A.Pituitary gland - Insulin
B.Adrenal gland - Adrenaline
C.Pancreas - Testosterone
D.Ovary - Glucagon
Download the worksheet for Coordination and Response - Hormones to practice offline. It includes additional chapter-level practice questions.
Homeostasis
SubtopicHomeostasis under Coordination and Response for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
When blood glucose levels are too low, which hormone is secreted to stimulate the conversion of glycogen into glucose?
A.Insulin
B.Adrenaline
C.Glucagon
D.Estrogen
- 2.
What is the primary physiological response of the skin's blood vessels when the body temperature rises above the normal set point?
A.Vasoconstriction of arterioles to reduce blood flow to the surface
B.Vasodilation of arterioles to increase blood flow to the surface capillaries
C.Contraction of erector muscles to make hairs stand upright
D.Decrease in the production of sweat by sweat glands
- 3.
In the regulation of blood glucose levels, which organ acts as the detector that senses changes in glucose concentration?
A.Liver
B.Brain
C.Pancreas
D.Kidney
Download the worksheet for Coordination and Response - Homeostasis to practice offline. It includes additional chapter-level practice questions.
Tropic responses (Phototropism/Gravitropism)
SubtopicTropic responses (Phototropism/Gravitropism) under Coordination and Response for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
In the following process diagram of a seedling's response to unilateral light, identify the primary biological response shown.
A.Phototropism
B.Gravitropism
C.Photosynthesis
D.Transpiration
- 2.
A plant shoot grows upwards, away from the center of the Earth. How is this growth movement classified?
A.Positive phototropism
B.Positive gravitropism
C.Negative gravitropism
D.Negative phototropism
- 3.
Which plant hormone is synthesized in the shoot tip and is responsible for regulating tropic responses?
A.Gibberellin
B.Auxin
C.Cytokinin
D.Abscisic acid
Download the worksheet for Coordination and Response - Tropic responses (Phototropism/Gravitropism) to practice offline. It includes additional chapter-level practice questions.