Question
Fig. 4.1 shows a cross section of part of a stem of buttercup, Ranunculus.
Fig. 4.2 is an outline drawing of one vascular bundle from the stem of Ranunculus.
(a) Draw and label the position of the xylem and the phloem in the outline of the vascular
bundle in Fig. 4.2. [2]
(b) Name the carbohydrate that is transported in the phloem.
(c) Substances transported in the phloem are carried upwards in the stem at some times
of the year and downwards at other times.
Explain why substances are transported in the phloem upwards at one time of the year
and downwards at another.
(d) Define the term transpiration.
(e) The rattan palm is a plant that climbs on rainforest trees to heights of about 40 metres.
Explain how water is moved to the tops of tall plants, such as the rattan palm.
Answer/Explanation
Ans:
Question
Fig. 6.1 shows a section through a plant root.
(a) (i) The X on Fig. 6.1 represents a molecule of water.
On Fig. 6.1, draw a line from the X to show the pathway this water molecule takes to
pass into the tissue that transfers it to the leaves. [1]
(ii) State the name of the process by which the water molecule moves into the root.
……………………………………………………………………………………………………………………. [1]
(iii) State the name of the tissue that transports the water to the leaves.
……………………………………………………………………………………………………………………. [1]
(b) Fig. 6.2 shows the apparatus used in an investigation.
In the investigation, several sets of this apparatus were set up.
Each set of apparatus was placed in a different temperature.
The rate of mineral ion uptake by the plants was measured.
The results are shown in Fig. 6.3.
(i) State the rate of mineral ion uptake at 25 °C in Fig. 6.3.
……………………………… arbitrary units [1]
(ii) Describe and explain the results shown in Fig. 6.3.
Use the data to support your answer.
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……………………………………………………………………………………………………………………. [4]
(c) State the name of one mineral ion that plants absorb through their roots and state why the
plants need this mineral ion.
name of mineral ion ……………………………………………………………………………………………………
needed for ………………………………………………………………………………………………………………..
…………………………………………………………………………………………………………………………………
[2]
Answer/Explanation
Ans:
