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InkFlaskCambridge IGCSE

Pupil sheet · Xylem, phloem and water uptake

Xylem, phloem and water uptake — final check

Name ______________________ Date ____________

Work alone, with the lesson closed. Answer every question; there are no hints.

1. describe

Describe how you would use a suitable stain to find the pathway of water through the above-ground parts of a plant. (a) Describe the method. (b) Describe the control, and say why it is needed. (c) State what you would expect to see.

(a) Method

(b) Control

(c) What you would expect to see

2. identify / state

The drawing shows the stem of a different plant, cut across. (a) Identify the tissues lettered P and R. (b) State the function of each one.

Drawing of a cross-section through the stem of another non-woody dicotyledonous plant, with four parts lettered. Six oval bundles stand in a ring near the outside. P: the group of small cells on the outer side of the bundle at the upper right. Q: the large, pale cells in the middle of the stem. R: the group of wide, thick-walled tubes on the inner side of the bundle at the bottom. S: the single outer layer of cells.

(a) P and R

(b) Their functions

3. describe / explain

Supplement. Describe three features of the structure of a xylem vessel, and explain how each one suits it to carrying water up a plant.

Feature 1, and how it helps

Feature 2, and how it helps

Feature 3, and how it helps

4. identify / explain

The drawing shows the root of a different plant, cut across. (a) Give the letter of a root hair cell, and state its functions. (b) Explain how the many root hairs help the plant.

Drawing of a cross-section through the young root of another plant, with four parts lettered. P: the thick-walled cells in the middle, which form a star with three arms. Q: a small group of cells between two arms of that star. R: one of the long, thin outgrowths on the outside of the root. S: the wide band of round cells inside the outer layer.

(a) Letter and functions

(b) How the root hairs help

5. outline

Outline the pathway taken by water from the soil to the mesophyll cells of a leaf. Identify each kind of cell or tissue it passes through, in order.

6. describe

Describe where the xylem and the phloem are found (a) in a root and (b) in a leaf of a non-woody dicotyledonous plant.

(a) Root

(b) Leaf

7. identify / explain

Supplement. The drawing shows a bean plant in summer. (a) Give the letter of a source, and explain why it is a source. (b) Give the letters of two sinks, and say what each one does with sucrose. (c) Identify the process that moves sucrose from the source to the sinks, and the tissue it moves in.

Drawing of a bean plant in summer, with four parts lettered. P: the small, pale new leaves still growing at the top of the shoot. Q: a large, full-grown green leaf with three leaflets. R: a green pod hanging from the stem, with seeds growing inside it. S: the roots in the soil.

(a) The source

(b) Two sinks

(c) Process and tissue

8. explain

Supplement. Explain why a leaf can be a sink at one time and a source at another.

9. compare

Supplement. Compare transport in the xylem with transport in the phloem: (a) what each one carries; (b) the direction each one carries it.

(a) What each carries

(b) Direction