Virtual Labs

Virtual experiments to study characteristics of plant cells and genomes

1. What is the first step in preparing a transverse section of a leaf for microscopic observation?

a: Staining the leaf with iodine Explanation

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b: Embedding the leaf in wax Explanation

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c: Cutting a thin slice using a new razor blade Explanation

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d: Hydrating the leaf in water Explanation

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2. In the procedure of a stem transverse section, which stain is used to distinguish xylem?

a: Iodine Explanation

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b: Toluidine blue Explanation

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c: Safranin Explanation

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d: Acetocarmine Explanation

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3. What is the purpose of placing the prepared stem transverse section in water during the experiment?

a: To soften the tissue for slicing Explanation

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b: To keep the section hydrated during observation Explanation

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c: To highlight vascular tissue Explanation

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d: To wash away excess stain Explanation

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4. After mounting a stained transverse section of a root, what is the correct sequence of objective lenses for observation?

a: High power -> Medium power -> Low power Explanation

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b: Medium power -> Low power -> High power Explanation

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c: Low power -> Medium power -> High power Explanation

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d: Low power -> High power -> Medium power Explanation

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5. While observing a transverse section of a dicot root, a student notices that the epidermal cells appear crushed and the edges are ragged, kaing it impossible to see individual cell boundaries. Which of the following is the most likely cause of this error?

a: The student used a high-power objective first Explanation

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b: The student used a dull razor blade to cut the section Explanation

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c: The section was left in Fast Green for too long Explanation

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d: The specimen was not stained with Safranin Explanation

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6. Which part of flower Transverse Section contains ovules?

a: Anther Explanation

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b: Filament Explanation

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c: Ovary Explanation

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d: Petal Explanation

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7. Which layer in root Transverse Section controls the movement of water into the vascular tissue?

a: Epidermis Explanation

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b: Cortex Explanation

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c: Endodermis Explanation

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d: Pith Explanation

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8. Which tissue lies just below the epidermis in stem Transverse Section?

a: Cortex Explanation

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b: Endodermis Explanation

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c: Pith Explanation

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d: Phloem Explanation

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9. Air spaces in leaf Transverse Section are mainly associated with:

a: Palisade tissue Explanation

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b: Spongy tissue Explanation

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c: Epidermis Explanation

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d: Vascular bundle Explanation

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10. Mesophyll tissue in leaf Transverse Section is mainly involved in:

a: Transport Explanation

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b: Protection Explanation

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c: Photosynthesis Explanation

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d: Storage Explanation

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