Translocation

Which process is used to move sucrose from a plant’s leaves to its flowers?

Feb/March 2016

Which option gives a description of translocation?

Feb/March 2017

While potato plants are growing, they form flowers and underground storage organs known as tubers. In this period, which parts of the plant function as sources and sinks for translocation?

Feb/March 2018

Fig. 4.1 shows a photograph of a tree that has been girdled. Girdling means removing a complete ring of bark and phloem all the way round the trunk.

Feb/March 2023

Dodder is a plant that lives on other plants known as hosts. The dodder plant joins to the host’s vascular bundles. The dodder plant lacks green leaves and roots. Which statement correctly describes the regions involved in translocation?

Feb/March 2024

What substance required for protein synthesis is transported into a leaf from the stem?

May/June 2016

Which process is an example of translocation?

May/June 2016

The diagram illustrates a leaf joined to the stem of a plant. What do the arrows at X indicate?

May/June 2017

Aphids are small insects that obtain their food by feeding on phloem sap in plants. Fig. 3.1 is a diagram of an aphid with its mouth parts placed into the stem of a plant. The diagram labels phloem and xylem.

May/June 2018

The diagram illustrates several potato tubers. New shoots are just starting to develop. Sucrose is being translocated from source to sink. Which statement is correct?

May/June 2019

Scientists study how substances move through a plant. They remove a ring of tissue from the stem. This takes away some of the transport vessels located around the stem’s outer edge. Several days later, they observe swelling above the section where the tissue was removed. What is the cause of the swelling?

May/June 2019

A ring of phloem tissue was cut away from the stem of a plant. Carbon dioxide containing radioactive carbon was then supplied to one leaf of the plant. The second diagram shows the locations of radioactive carbon after three hours. Which statements are supported by the experiment?

May/June 2021

Sucrose and amino acids are transported through a plant from sources to sinks. Which row identifies the sources and sinks?

May/June 2023

In an investigation of how substances move through a plant, a ring of tissue that includes the outer region of the transport tissue is cut away, as shown. Which statement accounts for the formation of a swelling in the stem?

May/June 2023

The diagrams show substances being transported from one plant cell to another. The arrows show the direction of movement of each substance. Which translocation diagram is labelled correctly?

May/June 2023

The diagrams display a cross-section of a root and a cross-section of a stem. In which tissues are amino acids carried?

May/June 2024

Which statement gives the best description of translocation?

May/June 2024

In certain countries, spring is the season when daffodil plants grow green leaves and form flowers. Which parts of the daffodil plants function as sources and sinks during spring?

May/June 2025

The diagram illustrates the stem of a plant. A section of the outer tissue, including the phloem, has been taken away. What effect will this have on transport in the plant?

Oct/Nov 2016

The diagram illustrates the stem of a plant. A strip of the outer tissue, including the phloem, has been removed. How is transport in the plant affected?

Oct/Nov 2016

The diagram illustrates a plant stem. A band of the outer tissue, including the phloem, has been taken away. In what way is transport in the plant affected?

Oct/Nov 2016

The diagram illustrates a plant stem. A section of the outer tissue, including the phloem, has been taken away. In what way is transport in the plant affected?

Oct/Nov 2016

What substance is carried by translocation in a flowering plant?

Oct/Nov 2016

The diagram shows a plant stem. A section of the outer tissue, including the phloem, has been taken away. How does this affect transport in the plant?

Oct/Nov 2016

Which substance is transported through translocation in a flowering plant?

Oct/Nov 2016

The diagram depicts the stem of a plant. A band of the outer tissue, including the phloem, has been taken away. In what way is transport in the plant affected?

Oct/Nov 2016

Which substance is transported by translocation in a flowering plant?

Oct/Nov 2016

What is the role of translocation?

Oct/Nov 2017

During different times of the year, both roots and leaves function as a source and a sink for sucrose and amino acids. At what time of year are the roots most active as a source?

Oct/Nov 2018

Roots and leaves each function both as a source and a sink for sucrose and amino acids at different times of the year. At what point in the year are the roots most active as a source?

Oct/Nov 2018

At different times of the year, both roots and leaves function as either a source or a sink for sucrose and amino acids. During which part of the year are roots most active as a source?

Oct/Nov 2018

In plants, what does translocation move?

Oct/Nov 2019

Which statement correctly describes translocation?

Oct/Nov 2019

Rabbits may harm trees by feeding on the bark and phloem. If the injury extends all the way round the stem, what will occur in the tree?

Oct/Nov 2019

Phloem is responsible for moving sucrose and amino acids throughout plants. Sucrose is a carbohydrate.

Oct/Nov 2019

Fig. 2.1 displays part of a cross-section through the stem of a young sunflower plant.

Oct/Nov 2019

Plants make glucose in their leaves and change some of it into sucrose.

Oct/Nov 2019

Translocation is the transport of sucrose and amino acids in the phloem tissue of a plant from source to sink. Which organ can serve as a source?

Oct/Nov 2021

In plants, by what process are amino acids transported from sources to sinks?

Oct/Nov 2021

Scientists are studying how substances move through a plant. They remove a ring of tissue from the stem. In doing so, some of the transport vessels around the stem’s outer edge are taken away. After several days, they observe swelling above the region where the tissue was removed. What is causing the swelling?

Oct/Nov 2022

Scientists study how substances move through a plant. They remove a ring of tissue from the stem. Taking away the tissue also removes some of the transport vessels located around the outer edge of the stem. After a few days, they observe swelling above the point where the tissue was removed. What is the cause of the swelling?

Oct/Nov 2022

Scientists study how substances move through a plant. They remove a ring of tissue from the stem by cutting it out. Taking away this tissue also takes away some of the transport vessels located around the stem’s outer edge. A few days later, they observe swelling above the region from which the tissue was removed. What is the cause of the swelling?

Oct/Nov 2022

Aphids are insects that obtain phloem sap by putting their mouthparts into phloem tissue. Fig. 3.1 shows an aphid feeding on phloem tissue in a leaf.

Oct/Nov 2022

As potato plants grow, they form flowers and underground storage organs known as tubers. At this stage, which parts of the plant function as sources and sinks for translocation?

Oct/Nov 2023

Scientists studied how sucrose moved through a plant. They used carbon dioxide that contained radioactive carbon, $^{14}\text{C}$. A clear plastic bag holding $^{14}\text{CO}_{2}$ was placed over one leaf of the plant. After 24 hours, the plant was put onto photographic film. The film turned black in the places where radioactive carbon had been found. Diagram 1 shows the plant at the beginning of the experiment, while diagram 2 shows the photographic film at the end of the experiment. Which conclusions can be drawn from the experiment?

Oct/Nov 2024

The table sets out the transport tissues in plants and some substances that may or may not move through these tissues. Which row is correct for translocation?

Oct/Nov 2024

Which statement gives the correct description of translocation?

Oct/Nov 2024

Aphids are arthropods. To feed, aphids push their mouthparts into the phloem in a plant stem. Fig. 2.1 shows an aphid.

Oct/Nov 2024

While the plant is growing, tomato plants form flowers and fruits. In a developing tomato plant, which parts act as sources, and which parts act as sinks?

Oct/Nov 2025

What does translocation mean?

Oct/Nov 2025