CAIE IGCSE Biology 3.3.2 Importance of Active Transport

Practise explaining why cells use active transport to absorb ions or molecules when diffusion cannot produce net uptake.

Exam points

explain nitrate-ion uptake when soil concentration is lower than concentration inside root hair cells
link oxygen and glucose to respiration, released energy and continued active transport
trace how reduced root respiration can lower nitrate uptake, amino-acid supply and plant protein synthesis

[Maximum number: 3]

Wetlands are important ecosystems. Researchers studied the feeding relationships between the organisms in an area of wetland on the coast of Texas.

Fig. 1.1 shows part of the food web that they studied.

Fig. 1.1

Describe how nitrate ions enter the roots of plants shown by arrow C on Fig. 1.2.

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3.3.2—Importance of active transport question 1