Zadanie 6c
State the functions of xylem and phloem in the leaf.
Phloem cells and source-to-sink transport
Relate sieve element and companion cell structures to loading, unloading and movement of sugar-rich sap.
Tę umiejętność sprawdza 14 zadań wzorowanych na arkuszach IB z lat 2022–2025.
Zadania sprawdzające tę umiejętność: 14 Otwórz w wyszukiwarce z filtrami
Zadanie 25
Which phloem feature assists transfer between a companion cell and its associated sieve-tube element? A. A thick impermeable wax layer between them B. Numerous plasmodesmata connecting their cytoplasm C. A mature sieve-tube element packed with nuclei D. Closed…
Zadanie 12
Which description fits a mature functioning sieve-tube element in an angiosperm? A. A dead hollow cell whose wall is heavily lignified B. A living cell containing cytoplasm but lacking a nucleus C. A cell filled mainly by many chloroplasts and a large nucleus…
Zadanie 2
Explain how phloem sap moves from a source to a sink.
Zadanie 33
Which proposed features describe mature phloem sieve-tube elements? I. Perforated end walls permit sap movement between adjacent elements. II. Each mature element retains a large nucleus controlling its metabolism. III. The wall is lignified like a xylem…
Zadanie 33
At the start of growth, a stored underground tuber supplies a young shoot whose leaves are not yet photosynthetically self-supporting. Which pairing identifies a source and a sink for translocated carbon compounds? A. Source: growing shoot; sink: tuber B.…
Zadanie 5b
Carbon fixed in a leaf can be exported towards growing roots. (i) Name the principal sugar transported in phloem. (ii) Explain its transport from leaves to roots.
Zadanie 8
(a) Explain how vesicles move materials within cells and across their surfaces. (b) Describe how dissolved carbon compounds are transported through phloem. (c) Outline how material moves from the stomach to the large intestine.
Zadanie 29
How can the proximity of xylem to phloem help translocation at a sugar-loading region? A. Xylem transfers all its lignin into sieve tubes B. Water can enter the sugar-rich phloem osmotically and help generate pressure C. The two tissues use the same continuous…
Zadanie 29
Which pressure relationship drives bulk flow of phloem sap from a source region towards a sink? A. Higher hydrostatic pressure at the source than at the sink B. Higher hydrostatic pressure at the sink than at the source C. Exactly equal hydrostatic pressure at…
Zadanie 29
Which pressure relationship drives bulk flow of phloem sap from a source region towards a sink? A. Higher hydrostatic pressure at the source than at the sink B. Higher hydrostatic pressure at the sink than at the source C. Exactly equal hydrostatic pressure at…
Zadanie 6
Plant transport and cellular energy transformations support growth. (a) Describe how a plant moves organic compounds from their source to a storage sink. (b) Compare and contrast photosynthesis with aerobic cellular respiration.
Zadanie 32
What can pass through the connections X during loading at a source? A. Intact starch granules as the principal transported sugar B. Cellulose fibres for long-distance transport C. Sucrose moving between the cells D. Whole chromosomes replacing all sieve-tube…
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Zadanie 7
Photosynthesis supplies carbohydrates that can be exported from leaves. (a) Describe ATP production linked to photosystem II in the light-dependent reactions. (b) Explain how carbohydrates move from leaves to other parts of a plant.