Transport in plants — IGCSE Biology (0970) questions by topic
Water's journey through a plant structures this topic: tracing the pathway from root hair to stomata, judging which conditions produce the lowest transpiration rate, circling substances carried in the phloem, and identifying where most water evaporates from a leaf.
Choose, state, identify, describe and explain span 1 to 12 marks across 38 real questions from 2023 to 2025 papers. Multiple-choice questions here often hinge on one reversed step in a sequence or one wrong tissue, so submitting each attempt for instant marking pinpoints exactly which stage of the transpiration or transport pathway needs revisiting.
May–June 2025, Paper 11
The roots of a plant are cut off and the stem is placed in a beaker containing a liquid red stain. After a few hours, in which part of the plant stem will the red stain be…
Answer this question and get it marked →May–June 2025, Paper 12
The diagram shows the movement of water molecules from a plant leaf to its environment. Part of a leaf cross-section is shown with mesophyll cells and a stoma in the lower…
Answer this question and get it marked →May–June 2025, Paper 21
Which graph shows the effect of humidity in the air on the rate of transpiration in a plant? Four graphs plot rate of transpiration (y-axis) against percentage humidity (x-axis,…
Answer this question and get it marked →In some countries, spring is the time of year when daffodil plants have green leaves and produce flowers. Which parts of the daffodil plants act as sources and sinks in spring?…
Answer this question and get it marked →May–June 2025, Paper 22
Which row shows the features of xylem vessels? vessel walls mitochondria present --- --- --- A thick yes B thick no C thin yes D thin no
Answer this question and get it marked →A student wanted to investigate the effect of humidity on transpiration. She set up two sets of apparatus with identical-sized plants of the same species. Tube X holds a leafy…
Answer this question and get it marked →May–June 2024, Paper 11
The diagram shows a cross-section of a leaf with cells labelled A, B, C and D. Which type of cell controls the entry of carbon dioxide into the leaf? A B C D
Answer this question and get it marked →What is present in a vascular bundle? A anthers B guard cells C palisade cells D xylem vessels
Answer this question and get it marked →What is the pathway taken by water from the soil to the leaf? A root hair cells → root cortex → mesophyll → xylem B root hair cells → root cortex → xylem → mesophyll C root cortex…
Answer this question and get it marked →May–June 2024, Paper 12
The diagram shows a cross-section of part of a leaf with cells labelled A, B, C and D. Which cell controls the rate of gas exchange? A B C D
Answer this question and get it marked →Which statement describes transpiration? A Water is pulled upwards by active transport. B Water is pulled up from the roots by phloem. C Water moves by osmosis inside the xylem…
Answer this question and get it marked →May–June 2024, Paper 21
When is the transpiration rate of a well-watered plant highest? A on a cool, dry, windy day B on a cool, wet, windy day C on a hot, dry, windy day D on a hot, wet, windy day
Answer this question and get it marked →Which statement is correct for a flowering plant during photosynthesis? A The flowers, fruits, leaves and roots are all sources of sucrose. B The fruits are a source of sucrose…
Answer this question and get it marked →May–June 2024, Paper 22
Which feature of xylem vessels provides support to plants? A cells are joined end to end B no cell contents C no cross-walls D lignin present
Answer this question and get it marked →Which change in an environmental factor will increase the rate of transpiration? A decreasing humidity B decreasing light intensity C decreasing temperature D decreasing wind speed
Answer this question and get it marked →Which statement describes translocation? A the movement of amino acids and sucrose from the source to the sink in phloem B the movement of amino acids and sucrose from the source…
Answer this question and get it marked →May–June 2024, Paper 32
Fig. 3.1 is a photomicrograph of a section through the stem of a plant. Use a label line and label to identify and name a structure that transports sucrose in Fig. 3.1.
Answer this question and get it marked →May–June 2024, Paper 41
Fig. 5.1 is a graph showing the effect of temperature on the rate of transpiration from the upper and lower surfaces of a leaf provided with a constant supply of water (with…
Answer this question and get it marked →October–November 2024, Paper 12
The diagram shows a cross-section of a stem with two structures labelled R and S. Which statement correctly describes the location and function of phloem?
Answer this question and get it marked →Some environmental factors are listed. 1 carbon dioxide concentration 2 temperature 3 oxygen concentration 4 wind speed Which factors directly affect the rate of transpiration?
Answer this question and get it marked →October–November 2024, Paper 22
Which conditions lead to the lowest rate of transpiration in a plant?
Answer this question and get it marked →The table shows the transport tissues of plants and some substances that may or may not travel through these tissues. Which row is correct for translocation? plant tissue…
Answer this question and get it marked →October–November 2024, Paper 32
A student investigated the effect of windspeed on the rate of transpiration. The student placed a fan at different distances from a plant shoot and measured the distance the air…
Answer this question and get it marked →May–June 2023, Paper 11
Which row shows the functions of xylem and phloem? Columns: transports amino acids; transports mineral ions; transports sucrose. A phloem; xylem; phloem B xylem; xylem; phloem C…
Answer this question and get it marked →What is the effect on a plant of not having any root hairs? A The plant absorbs less water from the soil. B The plant absorbs more water from the soil. C The plant loses water to…
Answer this question and get it marked →May–June 2023, Paper 12
Which pathway is taken by water through a plant? A root hair → root cortex → xylem → mesophyll → stomata B root hair → xylem → mesophyll → root cortex → stomata C stomata → root…
Answer this question and get it marked →Which row shows the transpiration rate for the conditions described? Columns: wind speed; atmospheric temperature; transpiration rate. A low; low; fast B high; high; slow C low;…
Answer this question and get it marked →May–June 2023, Paper 21
Which statement describes the effect of atmospheric humidity on the rate of transpiration? A In high humidity, the transpiration rate is high because there is slow diffusion of…
Answer this question and get it marked →Sucrose and amino acids move around a plant from sources to sinks. Which row shows the sources and sinks? Columns: root cortex cells; xylem vessels; palisade mesophyll cells. A…
Answer this question and get it marked →May–June 2023, Paper 22
Humidity and wind speed are two factors that affect the rate of transpiration. How do these two factors affect the concentration gradient of water molecules between the inside of…
Answer this question and get it marked →During an investigation into the movement of substances in a plant, a ring of tissue containing the outer part of the transport tissue (epidermis and outer part of transport…
Answer this question and get it marked →May–June 2023, Paper 31
Fig. 4.1 is a diagram of a cross-section of a root, with the part labelled X (phloem). Circle two substances transported by the part labelled X in Fig. 4.1. amino acids cellulose…
Answer this question and get it marked →October–November 2023, Paper 12
From which part of a leaf does most water evaporate during transpiration? A the cuticle B the guard cells C the spongy mesophyll cells D the xylem vessels
Answer this question and get it marked →The photograph shows a cross-section through a sunflower stem, with the tissue labelled Z. What is the name and function of the tissue labelled Z? Columns: name of tissue;…
Answer this question and get it marked →Scientists studied the uptake of potassium ions from chemical fertilisers by wheat plants. The results show potassium uptake (kg per hectare) against days after planting (0 to…
Answer this question and get it marked →October–November 2023, Paper 22
From which part of a leaf does most water evaporate during transpiration? A the cuticle B the guard cells C the spongy mesophyll cells D the xylem vessels
Answer this question and get it marked →The photograph shows a cross-section through a sunflower stem, with the tissue labelled Z. What is the name and function of the tissue labelled Z? Columns: name of tissue;…
Answer this question and get it marked →October–November 2023, Paper 32
Fig. 6.1 is a diagram showing the pathway of water into a plant (the arrows show the direction of water movement), with a soil particle, soil water, cell A, cell B and a xylem…
Answer this question and get it marked →Other IGCSE Biology topics
- Human nutrition (75)
- Organisms and their environment (64)
- Coordination and response (62)
- 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)
- Respiration (32)