Coordination and response — IGCSE Biology (0970) questions by topic
Coordination and response questions work through practical set-ups: interpreting a clinostat experiment on maize seedling roots grown under all-round light, identifying a hormone response from the adrenal glands, comparing root and shoot growth in bean seedlings pinned in different directions, and sequencing neurotransmitter events at a synapse.
Choose, state, identify, describe and complete lead 62 real questions worth 1 to 16 marks from 2023 to 2025 papers. Sequencing and diagram-based questions like these reward getting every step in the right order, so submitting an attempt for instant marking flags exactly where a stage, such as vesicle release or receptor binding, has been placed out of sequence.
May–June 2025, Paper 11
The diagram shows a reflex arc through the spinal cord. A sensory receptor in the skin connects via a neurone (labelled along the route) into the spinal cord; within the cord a…
Answer this question and get it marked →Which statements describe correct examples of tropic responses? 1 Gravitropism is the growth of plant roots away from gravity. 2 Gravitropism is the growth of plant roots towards…
Answer this question and get it marked →May–June 2025, Paper 12
A person touches a hot object which stimulates structure P in the skin. This causes an electrical impulse to be sent through structure Q to the central nervous system. Which row…
Answer this question and get it marked →The diagram shows the position of two glands in the body. Gland 1 is shown sitting on top of the left kidney, the right kidney is labelled, the duodenum is labelled, and gland 2…
Answer this question and get it marked →A seedling was placed in a horizontal position. Which diagram shows the expected gravitropic responses in the seedling? Diagram A: both root and shoot remain horizontal. Diagram…
Answer this question and get it marked →Which secondary sexual characteristic is associated with testosterone? A breast development B facial hair growth C start of the menstrual cycle D widening of hips
Answer this question and get it marked →May–June 2025, Paper 21
The diagram shows a synapse between neurone 1 and neurone 2. Labels point to different structures: P points to a small sac in the end of neurone 1; Q points to particles released…
Answer this question and get it marked →Which row shows the function of rod cells? night vision colour vision --- --- --- A yes yes B yes no C no yes D no no
Answer this question and get it marked →The diagram shows the positions of two endocrine glands in the human body, located on top of the kidneys (the adrenal glands). What is a response of the body to the hormone…
Answer this question and get it marked →What is a response of the human body to overheating? A vasoconstriction of arterioles B vasoconstriction of veins C vasodilation of arterioles D vasodilation of veins
Answer this question and get it marked →What is an example of phototropism? A the growth of a root in the direction of gravity B the growth of a shoot towards light C the release of energy from glucose using light D the…
Answer this question and get it marked →May–June 2025, Paper 22
The diagram shows a vertical section through part of a human eye. A fly is coming nearer to the eye. The eye begins to focus the image of the fly on the retina. Labelled parts: Q…
Answer this question and get it marked →Which organ produces glucagon? A adrenal gland B liver C ovary D pancreas
Answer this question and get it marked →A young seedling is growing underground. The shoot grows towards the surface of the ground. The root grows away from the surface of the ground. Which row describes the responses…
Answer this question and get it marked →May–June 2025, Paper 31
The eye is a sense organ. Complete the sentence to describe sense organs. Sense organs are groups of ................. cells responding to specific ................. such as…
Answer this question and get it marked →May–June 2025, Paper 41
The human retina contains receptor cells called rods and cones. Fig. 2.1 shows the distribution of receptor cells in a human retina. The graph plots number of receptors per mm^2…
Answer this question and get it marked →Some maize seeds were pinned on a board and provided with light from all directions. The board was placed in a clinostat that rotated the board. The board was rotated continuously…
Answer this question and get it marked →May–June 2024, Paper 11
The diagram shows an iris and a pupil in different light conditions (light and dark), with the pupil constricted in the light and dilated in the dark. Which characteristic of…
Answer this question and get it marked →Where is insulin secreted, and what is its effect on blood glucose concentration? Columns: secreted by; effect on blood glucose concentration. A liver; increases B liver;…
Answer this question and get it marked →May–June 2024, Paper 12
Which part of the eye contains light receptors? A cornea B iris C lens D retina
Answer this question and get it marked →Which row shows the effects of adrenaline secretion? Columns: pupil diameter; heart rate. A decreases; decreases B decreases; increases C increases; decreases D increases;…
Answer this question and get it marked →A plant pot is placed on its side. Diagrams A–D show plants with the direction of light indicated. Which diagram shows a plant with roots showing gravitropism and shoots showing…
Answer this question and get it marked →May–June 2024, Paper 21
A person touches a hot object and rapidly moves their hand away from the hot object. Which characteristic of living organisms is this an example of? A excretion B growth C…
Answer this question and get it marked →What would be the pupil size and lens shape of a person reading a mobile phone text message in a brightly lit room? Columns: pupil size; lens shape. A large; fat B large; thin C…
Answer this question and get it marked →What describes how the body maintains a constant internal temperature on a hot day? A Vasoconstriction increases blood flow to the skin surface capillaries. B Vasoconstriction…
Answer this question and get it marked →What would lead to a decrease in blood glucose concentration? A increased release of adrenaline B increased release of amylase C increased release of glucagon D increased release…
Answer this question and get it marked →The graph shows the concentration of four hormones (A, B, C, D) during the menstrual cycle, with ovulation at day 14. Which line represents progesterone? A B C D
Answer this question and get it marked →May–June 2024, Paper 22
Which process moves neurotransmitters across a synapse? A active transport B diffusion C gravity D osmosis
Answer this question and get it marked →When the blood glucose concentration is low, which hormone is released and which organ releases it? Columns: hormone; organ. A glucagon; liver B glucagon; pancreas C insulin;…
Answer this question and get it marked →A shoot grows towards the direction of light. These statements compare shoot cells on the side in the light with cells on the side in the shade. 1 Cells on the side in the light…
Answer this question and get it marked →May–June 2024, Paper 32
The human body must maintain a constant internal environment. State the term used to describe the maintenance of a constant internal environment.
Answer this question and get it marked →May–June 2024, Paper 41
Fig. 2.1 shows the internal body temperature of a human and the external environmental temperature during six hours in one day. The internal body temperature range is from 36.4 °C…
Answer this question and get it marked →May–June 2024, Paper 42
October–November 2024, Paper 12
A student exposed a fly larva to light and temperature gradients. They lit the area from one side and made one side of the area warmer than the other. They traced the path of the…
Answer this question and get it marked →What is the pathway of a reflex arc from the receptor to the effector?
Answer this question and get it marked →What is an effect of adrenaline secretion?
Answer this question and get it marked →October–November 2024, Paper 22
The diagram shows a synapse in a reflex arc with two neurones labelled P and Q. What are the identities of the two neurones and in which direction does the neurotransmitter pass?…
Answer this question and get it marked →Which responses occur in the iris of the eye when a person walks from a brightly lit area to a dimly lit area? circular muscles radial muscles --- --- --- A contract contract B…
Answer this question and get it marked →Which statements about hormones are correct? 1 Adrenaline decreases pupil diameter. 2 Adrenaline increases pupil diameter. 3 Insulin decreases blood glucose concentration. 4…
Answer this question and get it marked →May–June 2023, Paper 11
What is the name of the junction between two neurones? A effector B receptor C gland D synapse
Answer this question and get it marked →Which statement about adrenaline is correct? A It decreases the heart rate. B It decreases the diameter of the pupil. C It increases the breathing rate. D It is made in the…
Answer this question and get it marked →Which words complete the statements? Plant growth towards light is called ...1... . When a plant shoot grows towards a light source, it is showing a ...2... to light. Light acts…
Answer this question and get it marked →May–June 2023, Paper 12
The diagram shows the structures in a reflex arc, including structure X, a receptor and a muscle. What is X? A effector B relay neurone C sensory neurone D synapse
Answer this question and get it marked →Changes in light intensity cause changes in the diameter of the pupil in the eye. Rows describe combinations of light intensity and pupil diameter: 1 high; increases 2 high;…
Answer this question and get it marked →A hormone is injected into a person to reduce their blood glucose concentration. Which endocrine gland is not functioning properly in a person who needs to have this injection? A…
Answer this question and get it marked →May–June 2023, Paper 21
The events listed involve neurotransmitter molecules at a synapse. 1 They bind with receptor proteins. 2 They diffuse across the synaptic gap. 3 They enter the synaptic gap. 4…
Answer this question and get it marked →What occurs during accommodation to focus on distant objects? Columns: ciliary muscle; lens shape; suspensory ligaments. A contracts; fat; slack B relaxes; thin; tight C…
Answer this question and get it marked →What is a correct statement about auxin in shoots? A It is made only on the shaded side of the shoot. B It is more concentrated on the side of the shoot that receives the most…
Answer this question and get it marked →May–June 2023, Paper 22
Which statement describes what happens during the transmission of an electrical impulse along a reflex arc? A The relay neurone has receptor proteins which bind with…
Answer this question and get it marked →During the pupil reflex in bright light, what describes the actions of the muscles in the iris? A The circular muscles of the iris contract and the radial muscles relax. B The…
Answer this question and get it marked →Diagrams A–D show different distributions of auxin in a shoot tip with the direction of light indicated. Which distribution of auxin will cause the shoot tip to grow towards the…
Answer this question and get it marked →May–June 2023, Paper 31
Fig. 8.1 is a diagram representing a reflex action. When the knee is tapped with a small rubber hammer, the leg will immediately straighten. Parts X and Y are labelled. Identify…
Answer this question and get it marked →May–June 2023, Paper 32
The eye is a sense organ that contains receptor cells that respond to light. State three other stimuli that sense organs respond to.
Answer this question and get it marked →May–June 2023, Paper 42
A student investigated plant growth responses in roots and shoots. Damp cotton wool was placed in two Petri dishes; three bean seedlings were attached in each, each orientated so…
Answer this question and get it marked →October–November 2023, Paper 12
The diagram shows a reflex arc in a human nervous system. The person's finger has just made contact with a sharp object. Parts labelled A, B, C and D. Which part is the motor…
Answer this question and get it marked →Which lines on the graphs show the effects of adrenaline on pupil diameter and heart rate? The pupil diameter graph has lines W and X; the heart rate graph has lines Y and Z;…
Answer this question and get it marked →Which statements about tropisms in plants are correct? 1 Shoots grow towards light and away from gravity. 2 Shoots grow away from light and towards gravity. 3 Roots grow towards…
Answer this question and get it marked →October–November 2023, Paper 22
The diagram shows a reflex arc in a human nervous system. The person's finger has just made contact with a sharp object. Parts labelled A, B, C and D. Which part is the motor…
Answer this question and get it marked →Which hormones can increase blood glucose concentration? A adrenaline and insulin B adrenaline and glucagon C adrenaline only D glucagon only
Answer this question and get it marked →October–November 2023, Paper 42
Fig. 3.1 is a diagram of the junction between two neurones in a healthy person. Fig. 3.2 is a diagram of the junction between the same two neurones in a person who has Parkinson's…
Answer this question and get it marked →State the names of two hormones released by the ovaries.
Answer this question and get it marked →Other IGCSE Biology topics
- Human nutrition (75)
- Organisms and their environment (64)
- Reproduction (53)
- Organisation of the organism (cells) (50)
- Plant nutrition (42)
- Characteristics and classification of living organisms (40)
- Variation and selection (40)
- Transport in animals (39)
- Inheritance (39)
- Movement into and out of cells (38)
- Transport in plants (38)
- Respiration (32)