8.5: Consolidation and summary
Activity B8.5 Consolidation and summary Learning objectives
To review the learning points of the topic. To test understanding through answering questions.
Learning outcomes
Be familiar with the knowledge and understanding summarised in the End of Topic Checklist. Be able to apply this knowledge and understanding by answering the End of Topic Questions.
Resources Student Book pages 156–157
Approach Ask students to answer the End of Topic Questions.
Answers End of Topic Question mark scheme Question Correct answer
Marks
1
9 marks
Clearly drawn, and fully labelled, tissue plans for stem, root and leaf sections based on the photos in Fig 8.3 on page 148 of the Student Book (1 mark for clear drawing, 1 mark for labelling, 1 mark for correctly labelling phloem per diagram.)
2
They place the plant stem in water that contains soluble colouring.
1 mark
Water evaporates from the leaves of the plant due to transpiration.
1 mark
This draws water out of the xylem in the leaves, which causes more water to be drawn up the xylem in the stem from the bottom of the stem.
1 mark
The soluble colouring is carried with the water up the xylem and into the petals.
1 mark
(A higher-level answer should refer to the water potential gradients set up through the plant in response to transpiration from the leaves and petals.) 3
The leaves of the plant on the window sill receive more light than those on the shelf,
1 mark
so the stomata in the leaves of the windowsill plant will be open wider so that photosynthesis can continue as quickly as possible.
1 mark
Wide stomata allow water molecules to diffuse out of the air spaces in the 1 mark leaves more quickly. If the rate at which water is lost from the leaves is greater than the rate at which water is taken in from the soil, the cells in the plant will become flaccid, causing the plant to wilt.
1 mark
(The temperature of the air around the windowsill plant and the temperature of its leaves are also likely to be higher than for the shaded plant, increasing the rate of transpiration for the light plant compared with the shaded plant.) Cambridge IGCSE Biology Teacher Pack
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