Biology > QUESTION PAPER (QP) > Pearson Edexcel Level 3 GCE [Biology A (Salters Nuffield) Advanced Subsidiary PAPER 2: Development, (All)

Pearson Edexcel Level 3 GCE [Biology A (Salters Nuffield) Advanced Subsidiary PAPER 2: Development, Plants and the Environment]

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Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross . 1 Plant cells are organised into tissues, organs and systems. (a) The diagram shows a plant cell, as seen using an electron microscope. (i) Which structure contains pits? (1) A B C D (ii) Which structure could be reinforced with lignin? (1) A B C D (iii) Which structure contains vesicles? (1) A B C D (b) Plants contain xylem tissue. (i) Describe what is meant by the term tissue. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) It is possible to investigate the location of xylem tissue in a plant stem by using a microscope. The following method is used: 1. cut the stem of a broad bean plant just above soil level 2. place the cut end of the stem in a beaker of coloured dye for 30 minutes 3. cut thin sections of the stem to view using the microscope. Explain why the plant is left in the dye for 30 minutes before cutting sections through the stem.

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