Transport In Plants Test 1 12/11/12

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  • 1/10 Questions

    Guard cells help in:

    • Transpiration
    • Guttation
    • Fighting against infection
    • Protection against grazing
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About This Quiz

This 'Transport in Plants Test' dated 12\/11\/12 evaluates critical concepts such as stomatal function, translocation in sieve tubes, cohesion and adhesion in water transport, and the role of guard cells in transpiration. It's designed for learners to understand plant physiology mechanisms.

Transport In Plants Test 1 12/11/12 - Quiz

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  • 2. 

    Stomata of a plant open due to:

    • Influx of Potassium ions

    • Efflux of Potassium ions

    • Influx of Phosphorous ions

    • Efflux of Phosphorous ions

    Correct Answer
    A. Influx of Potassium ions
    Explanation
    Stomata of a plant open due to the influx of Potassium ions. When the concentration of Potassium ions increases inside the guard cells surrounding the stomata, water moves into the cells by osmosis, causing them to swell and open. This influx of Potassium ions and subsequent water movement is triggered by various factors such as light, low carbon dioxide levels, and the hormone abscisic acid. Opening the stomata allows for gas exchange, facilitating photosynthesis and transpiration in plants.

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  • 3. 

    The guard cells differ from other epidermal cells of the leaf in having:

    • Mitochondria

    • Lysosomes

    • Chloroplasts

    • Endoplasmic reticulum

    Correct Answer
    A. Chloroplasts
    Explanation
    Guard cells are specialized cells found in the epidermis of leaves that regulate the opening and closing of stomata. Stomata are small pores on the leaf surface that allow for gas exchange. Chloroplasts are responsible for photosynthesis, the process by which plants convert sunlight into energy. The presence of chloroplasts in guard cells allows them to produce energy through photosynthesis, enabling them to actively control the opening and closing of stomata in response to environmental cues such as light intensity and water availability.

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  • 4. 

    Rate of water absorption can be increased through ______.

    • Decreased transpiration

    • Decreased ion absorption

    • Increased photosynthesis

    • Increased transpiration

    Correct Answer
    A. Increased transpiration
    Explanation
    Increasing transpiration can increase the rate of water absorption in plants. Transpiration is the process by which water is lost from the leaves through small openings called stomata. When transpiration is increased, more water is drawn up from the roots to replace the water lost through the leaves. This increased flow of water through the plant helps to enhance the rate of water absorption.

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  • 5. 

    • The continuous column of water in vessel and tracheids during the ascent of sap does not usually get broken because of:

    • Weak gravitational pull

    • Transpirational pull

    • Lignified thick walls

    • Cohesion and adhesion

    Correct Answer
    A. Cohesion and adhesion
    Explanation
    The continuous column of water in the vessel and tracheids during the ascent of sap does not usually get broken because of cohesion and adhesion. Cohesion refers to the attraction between water molecules, causing them to stick together. Adhesion refers to the attraction between water molecules and the walls of the vessels and tracheids. These two forces work together to create a continuous column of water, allowing it to be pulled up through the plant without breaking. The weak gravitational pull, transpirational pull, and lignified thick walls also play a role in the ascent of sap, but they do not directly prevent the column of water from breaking.

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  • 6. 

    If the plant cell is immersed in water, the water continues to enter the cell until the _____

    • Concentration of salts is the same inside the cell as outside

    • Cell bursts

    • Diffusion pressure deficit is the same inside the cell as outside

    • Concentration of water is the same inside the cell as outside

    Correct Answer
    A. Concentration of water is the same inside the cell as outside
    Explanation
    When a plant cell is immersed in water, water molecules move into the cell through osmosis. Osmosis is the movement of water from an area of higher concentration to an area of lower concentration across a semi-permeable membrane. As water continues to enter the cell, it will keep moving into the cell until the concentration of water inside the cell is the same as outside. This is because osmosis will continue until equilibrium is reached, where the concentration of water is equal on both sides of the cell membrane.

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  • 7. 

    When beet root cylinders are washed and placed in cold water, anthocyanin does not come out. This indicates that most likely plasma membrane is:

    • Permeable to anthocyanin

    • Impermeable to anthocyanin

    • Differentially permeable to anthocyanin

    • Dead structure

    Correct Answer
    A. Impermeable to anthocyanin
    Explanation
    When beet root cylinders are washed and placed in cold water, if anthocyanin does not come out, it indicates that the plasma membrane is impermeable to anthocyanin. This means that the anthocyanin molecules are unable to pass through the plasma membrane and diffuse into the surrounding water. This suggests that the plasma membrane acts as a barrier and prevents the movement of anthocyanin molecules.

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  • 8. 

    Guttation is the result of:

    • Diffusion

    • Transpirational pull

    • Osmosis

    • Root pressure

    Correct Answer
    A. Root pressure
    Explanation
    Guttation is the process by which water is excreted in liquid form from the tips of leaves, usually occurring during the night or early morning. This phenomenon is caused by root pressure, which is the force generated by the roots of plants to push water and dissolved nutrients up through the xylem vessels. As the roots absorb water from the soil, the excess water accumulates in the plant and is forced out through specialized structures called hydathodes, resulting in guttation. Diffusion, transpirational pull, and osmosis are not directly responsible for guttation.

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  • 9. 

    Cohesion tension theory operates in _______.

    • Passive absorption

    • Active absorption

    • Both 1 and 2

    • None of these

    Correct Answer
    A. Passive absorption
    Explanation
    The cohesion tension theory explains how water is transported in plants through passive absorption. This process relies on the cohesive properties of water molecules and the tension created by transpiration pull. As water evaporates from the leaves, it creates a negative pressure that pulls water up through the xylem vessels. This theory does not involve active absorption, which would require energy expenditure by the plant. Therefore, the correct answer is passive absorption.

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  • 10. 

    The translocation of organic solutes in sieve tube members is supported by:

    • Cytoplasmic streaming

    • Root pressure and transpirational pull

    • P-proteins

    • Mass flow involving a carrier and ATP

    Correct Answer
    A. P-proteins
    Explanation
    P-proteins support the translocation of organic solutes in sieve tube members. P-proteins, also known as phloem proteins, are found in the sieve tube elements of the phloem tissue. They form a network of filaments that help regulate the movement of solutes through the sieve tubes. P-proteins can block the sieve plate pores, preventing the backflow of solutes, and also aid in sealing damaged sieve tubes. Therefore, P-proteins play a crucial role in facilitating the mass flow of organic solutes in the phloem.

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  • Jan 02, 2025
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  • Nov 10, 2012
    Quiz Created by
    A_nagvenker
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