Magnification of Images Quiz
40 Questions
4 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary function of a microscope in biological sciences?

  • To enhance color visibility in plants
  • To analyze chemical reactions
  • To measure plant growth rates
  • To observe structures too small for the naked eye (correct)

    • What are the three necessary elements to form an image using a microscope?

  • Specimen, camera, and illumination system
  • Specimen, light source, and lens system (correct)
  • A camera, lens system, and software
  • Light source, digital monitor, and specimen

    • Which microscope uses glass lenses to focus light on the specimen?

  • Light Microscope (correct)
  • Scanning Electron Microscope
  • Digital Microscope
  • Transmission Electron Microscope

    • How does specimen preparation differ between light microscopes and scanning electron microscopes?

    <p>Light microscope preparation is quicker, while SEM requires more time</p> Signup and view all the answers

    What kind of source is used in a transmission electron microscope?

    <p>Electromagnetic lens focusing on electrons</p> Signup and view all the answers

    Which of the following correctly describes the main difference between a scanning electron microscope (SEM) and a transmission electron microscope (TEM)?

    <p>SEM scans over specimens, whereas TEM transmits electrons through specimens</p> Signup and view all the answers

    What is the charge of electrons?

    <p>Negative</p> Signup and view all the answers

    What type of specimen is suitable for examination with a scanning electron microscope?

    <p>Only dead or dried specimens</p> Signup and view all the answers

    What does total magnification depend on when using a microscope?

    <p>The product of the magnification of the eyepiece and the magnification of the objective</p> Signup and view all the answers

    Which step is NOT part of finding the field of view under low power using a ruler?

    <p>Using the objective lens only</p> Signup and view all the answers

    What type of compounds are considered organic?

    <p>Carbohydrates, proteins, lipids, nucleic acids</p> Signup and view all the answers

    Why is it difficult to estimate the diameter of the field of view at higher power?

    <p>The field of view becomes narrower</p> Signup and view all the answers

    Which type of organic compound has a carbon backbone that influences its shape?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is an inorganic compound mentioned in biological organization?

    <p>Oxygen</p> Signup and view all the answers

    When finding the field of view, how do you measure fractions of millimeters?

    <p>By estimating based on visible markings on the ruler</p> Signup and view all the answers

    What is the significance of functional groups attached to the carbon skeleton in organic compounds?

    <p>They influence the reactivity and properties of the compounds</p> Signup and view all the answers

    Which type of parenchyma is primarily responsible for photosynthesis?

    <p>Chlorenchyma</p> Signup and view all the answers

    Which of the following is NOT a characteristic of collenchyma cells?

    <p>Cell walls that absorb stains</p> Signup and view all the answers

    What type of crystals can be found in plant vacuoles?

    <p>Calcium carbonate crystals</p> Signup and view all the answers

    Which parenchyma type features large air spaces?

    <p>Aerenchyma</p> Signup and view all the answers

    Which description best fits sclerenchyma cells?

    <p>Thick secondary walls with lignin and dead at maturity</p> Signup and view all the answers

    What is the primary function of parenchyma cells?

    <p>Storage and photosynthesis</p> Signup and view all the answers

    Which of the following describes the cell wall of collenchyma?

    <p>Unevenly thickened at the corners</p> Signup and view all the answers

    What type of parenchyma contains a high number of amyloplasts?

    <p>Storage parenchyma</p> Signup and view all the answers

    What happens to water molecules when they adhere to a sponge?

    <p>They form hydrogen bonds with the sponge material.</p> Signup and view all the answers

    What is the value of water potential for pure water?

    <p>0</p> Signup and view all the answers

    How does passive transport differ from active transport?

    <p>Active transport moves molecules against their concentration gradients.</p> Signup and view all the answers

    What is typically the sign of the osmotic potential in a plant cell?

    <p>Negative</p> Signup and view all the answers

    What condition represents a fully turgid plant cell?

    <p>Osmotic potential equals zero.</p> Signup and view all the answers

    What occurs when a flaccid cell is placed in a hypertonic solution?

    <p>Water moves out of the cell.</p> Signup and view all the answers

    What does the water potential equation account for?

    <p>The osmotic and pressure potential.</p> Signup and view all the answers

    Which statement accurately describes a plant cell in equilibrium with pure water?

    <p>It has a water potential of zero.</p> Signup and view all the answers

    What is the resolving power of a microscope that uses colored dyes for staining specimens?

    <p>0.25μm to 0.3μm</p> Signup and view all the answers

    Which feature describes the transmission electron microscope?

    <p>Produces images on photographic plates</p> Signup and view all the answers

    What allows free electrons to be focused in electron microscopes?

    <p>Their negative charge</p> Signup and view all the answers

    What is the main advantage of using heavy metals to coat specimens?

    <p>To enhance the contrast in the image</p> Signup and view all the answers

    How is the electron beam manipulated in an electron microscope?

    <p>With electromagnetic fields</p> Signup and view all the answers

    What is a significant characteristic of the wavelength in an electron microscope?

    <p>Wavelength is extremely short</p> Signup and view all the answers

    Why is a vacuum required in electron microscopy?

    <p>To prevent scattering of electrons</p> Signup and view all the answers

    What is the typical magnification range of a transmission electron microscope?

    <p>More than 100,000x</p> Signup and view all the answers

    Study Notes

    Magnification of Images

    • Magnification measures how much an image is enlarged compared to the actual object.
    • Total magnification is calculated as: Magnification of Eyepiece x Magnification of Objective.
    • To determine the field of view (FOV) under low power, place a ruler on the stage, center it, and note the visible millimeter markings.

    Chemical Components and Biological Organization

    • Life consists of both organic (carbon-based) and inorganic compounds.
    • Inorganic compounds include water, oxygen, and minerals, while organic compounds include carbohydrates, proteins, lipids, and nucleic acids.
    • Organic molecules are diverse due to the attachment of functional groups to the carbon skeleton.

    Microscopes in Botany

    • Microscopes are essential in biological sciences, allowing the visualization of small structures.
    • Microscope design and slide preparation fall under cytology.
    • There are two main microscope types: light microscopes and electron microscopes.

    Types of Microscopes

    • Light Microscope: Uses glass lenses and visible light. Magnification ranges from 500x to 1500x.
    • Transmission Electron Microscope (TEM): Utilizes electromagnetic lenses to view specimens through a fluorescent screen, achieving high resolution (0.001μm), and requires extensive specimen preparation.
    • Scanning Electron Microscope (SEM): Scans a specimen with a beam of electrons for three-dimensional images, also requires heavy metal coating for effective imaging.

    Types of Plant Cells

    • Parenchyma: Thin cell walls; functions in storage and photosynthesis; may have chloroplasts or starch (amyloplasts) for storage.
    • Collenchyma: Provides support with unevenly thickened walls; protoplast remains alive at maturity.
    • Sclerenchyma: Thick secondary walls with lignin; protoplast is dead; aids in water transport and structural support.

    Crystals in Plant Cells

    • Vauoles can crystallize solutes like salts and sugars, forming various shapes such as prismatic, druse, rosette, raphide, and cystolith.
    • Crystal formation often occurs in vacuoles and varies by shape, size, and composition.

    Transport Mechanisms in Cells

    • Passive Transport: Movement of molecules across cell membranes without ATP usage; follows concentration gradients.
    • Active Transport: Requires ATP to move molecules against concentration gradients.
    • Water potential (Ψw) relates to the movement of water, influenced by osmotic potential (ΨS) and pressure potential.

    Water Potential

    • Plant cells typically have a negative water potential unless in equilibrium with pure water, which is designated as zero.
    • Flaccid cells experience water loss in hypertonic solutions, leading to reduced functionality and support.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Botany Laboratory (LBBBION) Term 1 2024-2025 PDF

    Description

    Test your understanding of the magnification of images through lenses and the concept of field of view. This quiz covers how objects are enlarged or reduced and the calculations involved in determining magnification. Perfect for those studying optics or related fields.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser