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6. Plant nutrition
A section of Biology, 5090
Listing 10 of 238 questions
shows a section through a plant organ with a very small pipette inserted into tissue A. A micropipette Name the plant organ shown in . Name the tissue labelled A. The micropipette is used to take samples from tissue A at regular intervals over a 24-hour period. These samples are then analysed for their content. Explain how this might provide information about the rate of photosynthesis in the plant. Some insects have mouthparts similar to the tube of the micropipette. Suggest reasons for these insects using tissue A to supply their food.
5090_w14_qp_21
THEORY
2014
Paper 2, Variant 1
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shows part of the flowering head of a small tree that grows in tropical rainforests. gas H C D E gas K gas L F gas J Identify the structures C, D, E and F shown on . C D E F Structure D contains stomata similar to those found in the leaves. H, J, K and L represent gases that pass into and out of the leaves and flowers during daylight hours. Identify the gases H and J. H J The flowers are very pale pink in colour. Suggest the identity of gases K and L. Give an explanation for your answer. K L explanation Extracts from the tree have many uses in medicine. Some of the extracts are alkaline and have anti-bacterial properties. Some stomach problems are caused by excess acid production. Suggest why these tree extracts are sometimes used to treat such stomach problems.
5090_w16_qp_22
THEORY
2016
Paper 2, Variant 2
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The diagram shows a photomicrograph of the lower surface of a leaf. B C A Name each of the parts labelled A to C. cell A cell B pore C In an area affected by air pollution, the surface of the leaf becomes covered with particles. These particles reduce the amount of light entering the leaf and may block all pores of the type labelled C. Explain how this will affect the production of starch by the plant. A species of caterpillar, the holly looper, feeds on the leaves of the holly plant. Holly plants produce red berries that are eaten by a species of bird, the song thrush. Song thrushes also eat caterpillars and are eaten by hawks. Use the information above to: • Complete the food web below by writing the name of one species in each box. • Draw arrows between the boxes to show the direction of energy flow between organisms. holly State, for the food web above, the number of: species that are producers species that are consumers trophic levels.
5090_w21_qp_22
THEORY
2021
Paper 2, Variant 2
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Questions Discovered
238