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Edexcel IAL Biology 4.8 Water and inorganic ions in plants

Name the ion or water role, identify the molecule or structure produced and connect deficiency or altered supply to the measured plant response in the data.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
AS

Exam points

  • Explain water roles in photosynthesis, hydrolysis, transport and cell turgor.
  • Link nitrate, calcium or magnesium to proteins, walls, chlorophyll and growth.
  • Interpret ion-supply graphs or tables through biomass, roots, pods or yield.

4.8—Water and inorganic ions in plants question 1

[Maximum number: 5]

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Question (a)

(a)

The nutrient solutions contain magnesium ions and nitrates.

Describe the roles of these inorganic ions in the plants.

Magnesium ions

Nitrates

[ 2 ]

Question (b)

(b)

Fruits contain cells.

The effect of calcium ion concentration on the firmness of fruits was investigated.
Cherry plants were treated once, twice or three times, with two different concentrations of calcium chloride solution. The firmness of the cherry fruits from these plants was then measured.

The table shows the effect on the mean fruit firmness of these treatments and a control.

Table for Question (b) — Edexcel A-Level Biology AS
[ 3 ]

Question (i)

(i)

Explain the effect of calcium ion concentration on the firmness of cherry fruits.
(3)

[ 3 ]
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