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6.2. Leaf structure
A subsection of Biology, 0610, through 6. Plant nutrition
Listing 10 of 201 questions
Xerophytes are plants that are adapted for an environment which has very little available water. Describe the meaning of adaptation. is a photograph of a saguaro cactus, Carnegiea gigantea, which lives in a desert. The climate in a desert has very low rainfall and very high daytime temperatures. Describe two visible adaptive features shown in and explain how each feature is beneficial for living in a desert. feature 1 explanation feature 2 explanation Table 6.1 shows some data about stomatal density in the leaves of one plant that is not a xerophyte and three xerophyte plants. Table 6.1 species plant type number of stomata per mm2 upper leaf surface lower leaf surface oak tree not a xerophyte tongue leaf plant xerophyte lace aloe xerophyte ice plant xerophyte Using the information in Table 6.1, estimate the total number of stomata in an ice plant leaf with a lower leaf surface area of 8 cm2. stomata Explain the data shown in Table 6.1. There are xerophytic forests which are threatened by human overexploitation. Suggest reasons why it is important to conserve xerophytic ecosystems.
0610_w23_qp_43
THEORY
2023
Paper 4, Variant 3
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shows a photograph of some leaves on a tree. State two features of the leaves, visible in , that are adaptations for photosynthesis. is a diagram of part of a cross-section of a leaf. D A B C Explain how the parts of the leaf labelled A, B, C and D in adapt the leaf for gas exchange during photosynthesis. State the name of the mineral ion that plants need to make chlorophyll. Complete the sentences about transport in plants. Leaves contain bundles. The xylem in the bundles provides plants with support and transports water and from the to the leaves. Phloem in the bundles transports and amino acids.
0610_w24_qp_31
THEORY
2024
Paper 3, Variant 1
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is a photomicrograph of a cross-section of part of a leaf. J K L M N State the letter in that identifies where: gas exchange is controlled most photosynthesis occurs spongy mesophyll cells are found. Draw a circle on to identify a vascular bundle. Translocation occurs in the vascular bundle. State the names of two substances that are only moved by translocation. Explain how xylem vessels are adapted for their functions. Describe how water moves through a plant from the soil to the air spaces in a leaf. Explain why plants need nitrate ions.
0610_w24_qp_41
THEORY
2024
Paper 4, Variant 1
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Questions Discovered
201