Transport in Plants

Transport in Plants

Name: …………………………………………………….

Q. 1The diagram below show transverse sections of; A root, B stem and C leaf.

(a)(i)On transverse section A, B and BC, label the xylem and the phloem. [3]

(ii)On transverse section A and B, label the epidermis and cortex. [2]

(b)Complete the table below to compare the functions of xylem and the phloem. The term sap refers to the liquid transported in xylem and the phloem tissues.

feature / phloem / xylem
composition of the sap
direction of flow in the stem
destinations

[6]

(c)The diagram below shows the structure of root hair cell.

(i)Name the parts labelled A - E.

A; …………………………………. B; ………………………………….

C; …………………………………. D; ………………………………….

E. …………………………………. [5]

(ii)State and explain how the root hair cell is adapted to its functions of uptake of water and mineral ions.

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………. [3]

(d)The diagram below shows an investigation that was set up and left for 30 hours.

At the end of this time, the leaf had become red.

Suggest an explanation for this result.

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Q.2(a)Define the term transpiration.

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(b)The diagram below shows a section through a leaf.

(i)Name the parts labelled A – F.

A; ………………………………….

B; ………………………………….

C; ………………………………….

D; ………………………………….

E; ………………………………….

F. …………………………………. [6]

(ii)Using the diagram on previous page, describe how water is lost from the leaves in transpiration.

(c)Describe the effects of variation of temperature,humidity and light intensity on rate of transpiration.

temperature;………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………………………………………………

humidity;…………………………………………………………………………………...………………………………………………………………………………………………………………………………………………………………………………………………

light intensity………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………………………………………….. [6]

(d)Explain the mechanism of water uptake andmovement in terms of ‘transpiration pull’.

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(e)Discuss the adaptations of plants’ leaf, stem and root to aquatic(pond), garden and desertenvironments.

Aquatic environments;……………………………………………………………….. ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

garden environments;……………………………………………………………… ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

desert environments …………………………………….……………………… ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… [9]

Q. 3The diagram below shows a potometer which can be used to study loss of water from a leafy shoot.

A student used a potometer to compare themovement of water through a leafy shoot at different conditions. The table below shows the results obtained.

Conditions / Time taken by water to move 10 ± 0.5 cm.
A: cool, moving air, in daylight / 2.0
B: cool, still air, in daylight / 6.0
C: warm, moving air, in daylight / 1.0
D: warm, still air, in daylight / 3.0
E: warm, still air, night / 60.0

(a)From the table above, state three conditions which affect the rate of water movement through the plant.

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(b)Calculate the rate of water movement in millimetres per minute for condition A.

[2]

(c)State two ways in which the air around the shoot would be affected if it was covered with a transparent plastic bag.

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Q. 4(a) Translocation and transpiration are processes that occur in plants.

Describe each of these processes.

translocation ......

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transpiration ......

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(b)Compare the role of transpiration and translocation in the transport of materials from sources to sinks, within plants at different seasons.

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(c)Systemic pesticides are used by famers to control pests.

Describe translocation throughout the plant of systemic pesticides.

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